Document:

<PAGE>

                                                                    Exhibit 4.10

No. W-8       Warrant to Purchase Fifty Thousand (50,000) Shares of
                     Common Stock of Celerity Systems, Inc.
                             (Subject to adjustment)

Date of Issuance - As of September 30, 1999

                                     WARRANT

THIS WARRANT HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS
AMENDED, AND MAY NOT BE SOLD, OFFERED FOR SALE, PLEDGED OR HYOTHOCATED IN THE
ABSENCE OF A REGISTERATION STATEMENT IN EFFECT WITH RESPECT TO THE SECURITIES
UNDER SUCH ACT OR AN OPINION OF COUNSEL SATISFACTORY TO THE COMPANY THAT SUCH
REGISTRATION IS NOT REQUIRIED.

                        WARRANT TO PURCHASE COMMON STOCK

                                       of

                             CELERITY SYSTEMS, INC.

        This certifies that, for value received, May Davis Group, or its
registered assigns ("Holder") is entitled, subject to the terms set forth below,
to purchase from CELERITY SYSTEMS, INC., a Delaware corporation (the "Company"),
Fifty Thousand (50,000) shares of common stock of the Company, as constituted on
the date hereof (the "Warrant Issue Date"), upon surrender hereof, at the
principal office of the Company referred to below, with the subscription form
attached hereto duly executed, and simultaneous payment of the exercise price
(the "Exercise Price") therefore, as set forth in Sections 2 and 3 below. The
number, character and Exercise Price of such shares of Common Stock are subject
to adjustment as provided below. The term "Warrant" as used herein shall include
the Warrant and any warrants delivered in substitution or exchange therefore as
provided herein.

         1.       TERM OF WARRANT. Subject to the terms and conditions set forth
                  herein, the Warrant shall be exercisable, in whole or in part,
                  during the term commencing as of September 30, 1999 and ending
                  5:00 p.m., Eastern Time September 29, 2002 and shall be void
                  thereafter (the "Term").

         2.       EXERCISE PRICE. The Exercise Price at which the Warrant may be
                  exercised shall be $0.586 per share of Common Stock, as
                  adjusted from time to time to pursuant to Section 11 hereof
                  (the "Exercise Price").

<PAGE>

         3.       EXERCISE OF WARRANT.

                  (a)      The purchase rights represented by the Warrant are
                           exercisable by the Holder in whole or in part, but
                           not for less than 100 shares at a time (or such
                           lesser number of shares which may then constitute the
                           maximum number purchasable; such number being subject
                           to adjustment as provided in Section 11 below), at
                           any time, or from time to time, during the Term
                           hereof as described in Section 1 above, by the
                           surrender of this warrant and Notice of Exercise
                           annexed hereto as EXHIBIT "A" duly completed and
                           executed on behalf of the Holder, at the office of
                           the Company (or such other office or agency of the
                           Company as it may designate by notice in writing to
                           the Holder at the address of the Holder appearing
                           on the books of the Company) upon payment in cash
                           or by check acceptable to the Company in an amount
                           equal to the product of the Exercise Price set
                           forth in Section 2 above multiplied by the number
                           of shares of common Stock being purchased upon such
                           exercise.

                  (b)      This Warrant shall be deemed to have been exercised
                           immediately prior to the close of business on the
                           date of its surrender for exercise as provided above,
                           and the person entitled to receive the shares of
                           Common Stock issuable upon such exercise shall be
                           treated for all purposes as the holder of record of
                           such shares as of the close of business on such date.
                           As promptly as practicable on or after such date and
                           in event within ten (10) days thereafter, the Company
                           as its expense shall issue and deliver to the person
                           or persons entitled to receive the same certificate
                           or certificates for the number of shares issuable
                           upon such exercise. In the event that this Warrant is
                           exercised in part, the Company at its expense will
                           execute and deliver a new Warrant of like tenor
                           exercisable for the number of shares for which this
                           warrant may then be exercised

        4.     NO FACTIONAL SHARES OR SCRIP. No fractional shares or scrip
               representing fractional shares shall be issued upon the exercise
               of this warrant. In lieu of any fractional share to which the
               Holder otherwise be entitled, the Company shall make a cash
               payment equal to the Current Market value multiplied by such
               fraction.

        Current Market Value of one share Common Stock shall mean:

         (1) If the common Stock is listed on national securities exchange or
admitted to unlisted trading privileges on such exchange or listed for trading
on the NASDAQ National Market system or Small cap system, the Current Market
Value shall be last reported sale price of the common Stock on such exchange or
system on the last business

<PAGE>

day prior to the date of exercise of this Warrant or if no such sale is made on
such day, the average closing bid and asked prices for such day on such exchange
or system or

         (2) If the common Stock is not so listed or admitted to unlisted
trading privileges, the current market value shall be the mean of the last
reported bid and asked prices reported by the NASDAQ Electronic Bulletin Board
or its then existing successor on the last business day prior to the date of the
exercise of this Warrant; or

         (3) If the Common Stock is not so listed or admitted to unlisted
trading privileges and bid and asked prices are not so reported, the Current
Market Value shall be an amount determined in such reasonable manner as may be
prescribed by the Board of Directors of the Company.

         5.       REPLACEMENT OF WARRANT. On receipt of evidence reasonably
                  satisfactory to the Company of the loss, theft, destruction,
                  or mutilation of this warrant and, in the case of loss, theft,
                  or destruction, on delivery of an indemnity agreement
                  reasonably satisfactory in form and substance to the Company
                  or, on the case of mutilation, on surrender and cancellation
                  of this Warrant, the Company at its expense shall execute and
                  deliver, in lieu of this Warrant, a new warrant of like tenor
                  and amount.

         6.       RIGHTS OF STOCKHOLDERS. This warrant shall not entitle the
                  Holder to any of the rights of a Stockholder of the Company.

         7.       TRANSFER WARRANT.

         (a) WARRANT REGISTER. The Company will maintain a register ( the
"Warrant Register") containing the names and addresses of the Holder or Holders.
Any Holder of this Warrant or any portion thereof may change his address as
shown on the Warrant Register by written notice to the Company requesting such
change. Any notice or written communication required or permitted to be given by
mail to such Holder as shown on the Warrant Register and at the address shown on
the Warrant Register. Until this Warrant is transferred in the Warrant Register
of the Company, the Company may treat the holder as shown on the Warrant
Register as the absolute owner of this Warrant for all purposes, notwithstanding
any notice to the contrary.

         (b) TRANSFERABILITY AND NONNEGOTIABILITY OF WARRANT AND UNDERLYING
COMMON STOCK. This Warrant may be transferred or assigned in whole or in part
without compliance with all applicable federal and state securities laws by the
transferor and the transferee (including the delivery of investment
representation letters and legal opinions reasonably satisfactory to the
Company, if such are requested by the Company). Subject to the provisions of
this Warrant with respect to compliance with the Securities Act 1933, as amended
(the "Act"), title to this Warrant may be transferred by the endorsement (by the
Holder executing the Assignment Form annexed hereto as Exhibit B) and delivery
in the same manner as a negotiable instrument transferable by the endorsement
and delivery.

<PAGE>

The Common Stock to be issued upon exercise hereof, may not be transferred or
assigned in whole or in part without compliance with all applicable federal and
state securities laws by the transferor and the transferee (including the
delivery of investment representation letters and legal opinions reasonably
satisfactory to the Company, if such are requested by the Company)

         (c) EXCHANGE OF WARRANT UPON A TRANSFER. On surrender of this Warrant
for exchange, properly endorsed on the Assignment Form and subject to the
provisions of this Warrant with respect to compliance with the Act and with the
limitations on assignments and transfers and contained in this Section 7, the
Company at its exercise shall issue to or the order of the Holder a new warrant
or warrants of like tenor, in the name of the Holder or as the Holder (on
payment by the Holder of any applicable transfer taxes) may direct, for the
number of shares issuable upon exercise thereof.

         (d) COMPLIANCE WITH SECURITIES LAWS.

                  (i) The Holder of this Warrant, by acceptance hereof,
acknowledges that this Warrant and the shares of Common Stock to be issued upon
exercise hereof or conversion thereof being acquired solely for the Holder's own
account and not as a nominee for any other party, and for investment, and that
the Holder will not offer, sell or otherwise dispose of this Warrant or any
shares of Common Stock to be issued upon exercise hereof except under
circumstances that will not result in a violation of the Act or any state
securities laws. Upon exercise of this Warrant, the Holder shall, if requested
by the Company, confirm in writing, in a form satisfactory to the Company, that
the shares of Common Stock so purchased are being acquired solely for the
Holder's own account and not as a nominee for any other party, for investment,
and not with a view toward distribution or resale.

                  (ii) This Warrant and all shares of Common Stock issued upon
exercise hereof shall, unless registered under the Act, be stamped or imprinted
with a legend in substantially the following form (in addition to any legend
required by the State securities laws):

         THE SECURITIES PRESENTED HEREBY HAVE BEEN ACUIRED FOR INVESTMENT
         AND HAVE NOT BEEN REGISTED UNDER THE SECURITIES ACT OF 1933, AS
         AMENDED. SUCH SECURITIES AND ANY SECURITIES OR SHARES ISSED
         HEREUNDER OR THEREUNDER MAY NOT BE SOLD OR TRANSFERRED IN THE
         ABSENCE OF SUCH REGISTRATION OR EXEPTION THEREFORM UNDER SAID ACT.
         COPIES OF THE AGREEMENT COVERING THE PURCHASE OF THESE SECURITIES
         AND RESTRICTING THEIR TRANSFER OR SALE MAY BE OBTAINED AT NO COST
         BY WRITTEN REQUEST MADE BY THE HOLDER OF RECORD HEREOF TO THE
         SECRETARY OF THE COMPANY AT THE PRINCIPAL EXECUTIVE OFFICES OF THE
         COMPANY.

<PAGE>

         8.       RESERVATION OF STOCK. The company covenants that during the
                  Term this Warrant is exercisable, the Company will reserve
                  from its authorized and unissued Common Stock a sufficient
                  number of shares to provide for the issuance of Common Sock
                  upon the exercise of this warrant, and from time to time, will
                  take all steps necessary to amend its Certificate of
                  Incorporation (the "Certificate") to provide sufficient
                  reserves of shares of Common Stock issuable upon exercise of
                  the Warrant. The Company further covenants that all shares may
                  be issued upon the exercise of rights represented by this
                  Warrant, upon exercise of the rights represented by this
                  Warrant and payment of the Exercise Price, all as set forth
                  herein, will be in free from all taxes, liens and charges in
                  respect of the issue thereof (other than taxes in respect of
                  any transfer occurring contemporaneously or otherwise
                  specified herein). The Company agrees that its issuance of
                  this Warrant shall constitute full authority to its officers
                  who are in charged with the duty of executing stock
                  certificates to execute and issue the necessary certificates
                  for shares of Common Stock upon the exercise of this Warrant.

         9.       NOTICES.

         (a) Whenever the Exercise Price or number of shares purchasable
hereunder shall be adjusted pursuant to Section 11 hereof, the Company shall
issue a certificate signed by its Treasurers setting forth, in reasonable
detail, the event requiring the adjustment, the amount of the adjustment, the
method by which such adjustment was calculated and the Exercise Price and number
of shares purchasable hereunder after giving effect to such adjustment. And
shall cause a copy of such certificate to be mailed (by first class mail,
postage prepaid) to the Holder of this Warrant.

         (b) In case

                  (i) The Company shall take a record of the holders of its
Common Stock (or other stock or securities at the time receivable upon the
exercise of this Warrant) for the purposes of entitling them to receive any
dividend or other distribution, or any right to subscribe for or purchase any
shares of stock of any class or any other securities, or to receive any other
right, or

                  (ii) of any reclassification of the capital stock of the
Company, any consolidation or merger of the Company with or into another
corporation, or any conveyance of all or subsequently all the assets of the
Company to another incorporation, or

<PAGE>

                  (iii) of any voluntary dissolution, liquidation of winding-up
of this Company,

then, and in each such case, the Company will mail or cause to mail the Holder
or Holders a notice specifying, as the case may be (A) the date on which a
record is to be taken for the purpose of such dividend, distribution or right
and stating the amount and character of such dividend distribution or right, or
(B) the date on which such reorganization, reclassification, consolidation
merger, conveyance dissolution, liquidation or winding-up is to take place, and
the time, if any is to be fixed, as of which the holders of record of Common
Stock (or such stock or securities at the time receivable upon the exercise of
this Warrant) shall be entitled to exchange their shares of Common Stock (or
such other stock or securities) for securities or other property deliverable
upon such reorganization, reclassification, consolidation, merger, conveyance,
dissolution, liquidation or winding-up. Such notice shall be mailed at least 10
days prior to the date therein specified.

         (c) All such notices, advices and communications shall be deemed to
have been received (i) in the case of personal delivery, on the date of such
delivery and (ii) in the case of mailing, on the third (3) business day
following the date of such mailing.

         10.      AMENDMENTS.

         (a) Any term of this Warrant may be amended with the written consent of
the Company and the Holder.

         (b) No waivers of or exceptions to any term, condition or provision of
this Warrant, in any one or more instances, shall be deemed to be, or construed,
a further or continuing waiver of any such term, condition, or provision.

         11.      ADJUSTMENTS. The exercise Price and the number of shares
                  purchasable hereunder are subject to adjustment from time to
                  time as follows:

         11.1 MERGER RECLASSIFICATION, ETC. If the Company at any time while
this Warrant or any portion thereof, remains outstanding and unexpired shall, by
merger, consolidation, reclassification of securities or otherwise, change any
of the securities as to which purchase rights under this Warrant exists into the
same or a different number of securities of any other class or classes this
Warrant shall thereafter represent the right to acquire such number and kind of
securities which were subject to the purchase rights under this Warrant
immediately prior to such merger, consolidation, reclassification or other
change and the Exercise Price therefore shall be approximately adjusted, all
subject to further adjustment as provided in Section II.

         11.2 SPLIT, SUBDIVISION OF COMBINATION OF SHARES. If the Company at any
time while this warrant, or any portion thereof, remains outstanding and
unexpired shall split, subdivided or combine the securities as to which purchase
rights under this Warrant exist, into a different number of securities of the
same class, the Exercise Price for such

                                       1
<PAGE>

securities shall be proportionately decreased in the case of a split or
subdivision or proportionately increased in the case of combination.

         11.3 CERTIFICATE AS TO ADJUSTMENTS. Upon the occurrence of each
adjustment or readjustment pursuant to this Section 11, the Company at its
expense shall promptly compute such adjustment in accordance with the terms
hereof and furnish to each holder of this Warrant a certificate setting forth
such adjustment or readjustment and showing in detail the facts upon which such
adjustment and readjustment is based. The Company shall, upon written request,
at any time, of any such holder, furnish or cause to be furnished to such holder
a like certificate setting forth: (i) such adjustments and readjustments; (ii)
the Exercise Price at the time in effect and; (iii) the number of shares and the
amount, if any, of other property which at the time would be received upon the
exercise of the Warrant.

         11.4 NO IMPAIRMENT, The Company will not, by any voluntary action,
avoid or seek to avoid the observance or performance of any of the terms to be
observed or performed hereunder by the Company, but will at all times in good
faith assist in the carrying out of all the provisions of this Section 11 and in
the taking of all of such action as may be necessary or appropriate in order to
protect the rights of the holders of this Warrant against impairment.

         12.      MISCELLANEOUS.

         12.1 AMENDMENTS OF WAIVER. Except as otherwise provided herein, the
provisions of the Warrants may be amended and the Company may take any action
herein prohibited, or omit to perform any act herein required to be performed by
it, only if the Company has obtained the written consent of the Holder.

         12.2 NOTICES. Any notices required to be sent to a Holder will be
delivered to the address of such Holder shown on the books of the Company. All
notices referred to herein will be delivered in person or sent by first class
mail, postage prepaid and will be deemed to have been given when so delivered or
sent.

         12.3 DESCRIPTIVE HEADINGS: GOVERNING LAW. The descriptive heading of
the paragraphs of this Warrant are inserted for convenience only and do not
constitute a part of this Warrant. The construction, validity and interpretation
of this Warrant will be governed by the laws of the States of Delaware, without
regard to principals of conflicts or choice of law.

<PAGE>

IN WITNESS WHEREOF, CELERITY SYSTEMS, INC. caused this Warrant to be executed by
its officers thereunto duly authorized.

Dated: September 30, 1999

                                             CELERITY SYSTEMS, INC.

                                             By: /s/ Kenneth D. Van Meter
                                             Title: President & CEO

AGREED AND ACCEPTED:

HOLDER:

        By:
        Title:

<PAGE>

                                    EXHIBIT A

                           FORM OF NOTICE OF EXERCISE

To:     CELERITY SYSTEMS, INC.

         (1) The undersigned hereby elects to purchase shares of Common Stock of
CELERITY SYSTEMS, INC. pursuant to the terms of the attached Warrant, and
tenders herewith payments of the purchase price for such shares in full.

         (2) In exercising this Warrant, the undersigned hereby confirms and
acknowledges that the shares of Common Stock are being acquired solely for the
account of the undersigned and not as a nominee for any other party, and for
investment, and that the undersigned will not offer, sell, or otherwise dispose
of any such shares of Common Stock except under circumstances that will not
result in a violation of the Securities Act of 1933, as amended, or any state
securities laws.

         (3) Please issue a certificate or certificates presenting said shares
of Common Stock in the name of the undersigned or in such other name as is
specified below:

                                              Name

                                              Name

         (4) Please issue a new Warrant for the unexercised portion of the
attached Warrant in the name of the undersigned or in such other name as
specified below.

                                              Name

                                              Name

                                       2
<PAGE>

                                    EXHIBIT B

                            FORM OF ASSIGNEMENT FORM

FOR VALUE RECEIVED, the undersigned registered owner of this Warrant hereby
sells, assigns and transfers unto the Assignee names below all of the rights of
the undersigned under the within Warrant, with respect to the number of shares
of Common Stock set forth below but not below

Name of Assignee              Address                No. of Shares

And does hereby irrevocably constitute and appoint
Attorney to make such transfer on the books of CELERITY SYSTEMS, INC. maintained
for the purpose with full power of substitution in the premises.

The undersigned also represents that, by assignment hereof, the Assignee
acknowledges that this Warrant and the shares of stock to be issued upon
exercise hereof or conversion thereof are being acquired for investment and that
the Assignee will not offer, sell or otherwise dispose of this Warrant or any
shares of stock to be issued upon exercise hereof or conversion thereof except
under circumstances which will not result in a violation of the Securities Act
1933, as amended, or any state securities laws. Further, the Assignee has
acknowledged that upon exercise of this Warrant, the Assignee shall, if
requested by the Company, confirm in writing, in a form satisfactory to the
Company, that the shares of stock so purchased are being acquired for investment
and not with a view toward distribution or resale.

DATED:
                                         Signature of Holder

                                         Witness

                                       3
<PAGE>

No. W-9       Warrant to Purchase Fifty Thousand (50,000) Shares of
                     Common Stock of Celerity Systems, Inc.
                             (Subject to adjustment)

Date of Issuance - As of September 30, 1999

                                     WARRANT

THIS WARRANT HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS
AMENDED, AND MAY NOT BE SOLD, OFFERED FOR SALE, PLEDGED OR HYOTHOCATED IN THE
ABSENCE OF A REGISTERATION STATEMENT IN EFFECT WITH RESPECT TO THE SECURITIES
UNDER SUCH ACT OR AN OPINION OF COUNSEL SATISFACTORY TO THE COMPANY THAT SUCH
REGISTRATION IS NOT REQUIRIED.

                        WARRANT TO PURCHASE COMMON STOCK

                                       of

                             CELERITY SYSTEMS, INC.

        This certifies that, for value received, Mark Angelo, or its registered
assigns ("Holder") is entitled, subject to the terms set forth below, to
purchase from CELERITY SYSTEMS, INC., a Delaware corporation (the "Company"),
Fifty Thousand (50,000) shares of common stock of the Company, as constituted on
the date hereof (the "Warrant Issue Date"), upon surrender hereof, at the
principal office of the Company referred to below, with the subscription form
attached hereto duly executed, and simultaneous payment of the exercise price
(the "Exercise Price") therefore, as set forth in Sections 2 and 3 below. The
number, character and Exercise Price of such shares of Common Stock are subject
to adjustment as provided below. The term "Warrant" as used herein shall include
the Warrant and any warrants delivered in substitution or exchange therefore as
provided herein.

         1.       TERM OF WARRANT. Subject to the terms and conditions set forth
                  herein, the Warrant shall be exercisable, in whole or in part,
                  during the term commencing as of September 30, 1999 and ending
                  5:00 p.m., Eastern Time September 29, 2002 and shall be void
                  thereafter (the "Term").

         2.       EXERCISE PRICE. The Exercise Price at which the Warrant may be
                  exercised shall be $0.586 per share of Common Stock, as
                  adjusted from time to time to pursuant to Section 11 hereof
                  (the "Exercise Price").

                                       4
<PAGE>

         3.       EXERCISE OF WARRANT.

                  (a)      The purchase rights represented by the Warrant are
                           exercisable by the Holder in whole or in part, but
                           not for less than 100 shares at a time (or such
                           lesser number of shares which may then constitute the
                           maximum number purchasable; such number being subject
                           to adjustment as provided in Section 11 below), at
                           any time, or from time to time, during the Term
                           hereof as described in Section 1 above, by the
                           surrender of this warrant and Notice of Exercise
                           annexed hereto as EXHIBIT "A" duly completed and
                           executed on behalf of the Holder, at the office of
                           the Company (or such other office or agency of the
                           Company as it may designate by notice in writing to
                           the Holder at the address of the Holder appearing on
                           the books of the Company) upon payment in cash or by
                           check acceptable to the Company in an amount equal to
                           the product of the Exercise Price set forth in
                           Section 2 above multiplied by the number of shares of
                           common Stock being purchased upon such exercise.

                  (b)      This Warrant shall be deemed to have been exercised
                           immediately prior to the close of business on the
                           date of its surrender for exercise as provided above,
                           and the person entitled to receive the shares of
                           Common Stock issuable upon such exercise shall be
                           treated for all purposes as the holder of record of
                           such shares as of the close of business on such date.
                           As promptly as practicable on or after such date and
                           in event within ten (10) days thereafter, the Company
                           as its expense shall issue and deliver to the person
                           or persons entitled to receive the same certificate
                           or certificates for the number of shares issuable
                           upon such exercise. In the event that this Warrant is
                           exercised in part, the Company at its expense will
                           execute and deliver a new Warrant of like tenor
                           exercisable for the number of shares for which this
                           warrant may then be exercised.

        4.     NO FACTIONAL SHARES OR SCRIP. No fractional shares or scrip
               representing fractional shares shall be issued upon the exercise
               of this warrant. In lieu of any fractional share to which the
               Holder otherwise be entitled, the Company shall make a cash
               payment equal to the Current Market value multiplied by such
               fraction.

        Current Market Value of one share Common Stock shall mean:

         (1) If the common Stock is listed on national securities exchange or
admitted to unlisted trading privileges on such exchange or listed for trading
on the NASDAQ

                                       5
<PAGE>

National Market system or Small cap system, the Current Market Value shall be
last reported sale price of the common Stock on such exchange or system on the
last business day prior to the date of exercise of this Warrant or if no such
sale is made on such day, the average closing bid and asked prices for such day
on such exchange or system or

         (2) If the common Stock is not so listed or admitted to unlisted
trading privileges, the current market value shall be the mean of the last
reported bid and asked prices reported by the NASDAQ Electronic Bulletin Board
or its then existing successor on the last business day prior to the date of the
exercise of this Warrant; or

         (3) If the Common Stock is not so listed or admitted to unlisted
trading privileges and bid and asked prices are not so reported, the Current
Market Value shall be an amount determined in such reasonable manner as may be
prescribed by the Board of Directors of the Company.

         5.       REPLACEMENT OF WARRANT. On receipt of evidence reasonably
                  satisfactory to the Company of the loss, theft, destruction,
                  or mutilation of this warrant and, in the case of loss, theft,
                  or destruction, on delivery of an indemnity agreement
                  reasonably satisfactory in form and substance to the Company
                  or, on the case of mutilation, on surrender and cancellation
                  of this Warrant, the Company at its expense shall execute and
                  deliver, in lieu of this Warrant, a new warrant of like tenor
                  and amount.

         6.       RIGHTS OF STOCKHOLDERS. This warrant shall not entitle the
                  Holder to any of the rights of a Stockholder of the Company.

         7.       TRANSFER WARRANT.

         (a) WARRANT REGISTER. The Company will maintain a register (the
"Warrant Register") containing the names and addresses of the Holder or Holders.
Any Holder of this Warrant or any portion thereof may change his address as
shown on the Warrant Register by written notice to the Company requesting such
change. Any notice or written communication required or permitted to be given by
mail to such Holder as shown on the Warrant Register and at the address shown on
the Warrant Register. Until this Warrant is transferred in the Warrant Register
of the Company, the Company may treat the holder as shown on the Warrant
Register as the absolute owner of this Warrant for all purposes, notwithstanding
any notice to the contrary.

         (b) TRANSFERABILITY AND NONNEGOTIABILITY OF WARRANT AND UNDERLYING
COMMON STOCK. This Warrant may be transferred or assigned in whole or in part
without compliance with all applicable federal and state securities laws by the
transferor and the transferee (including the delivery of investment
representation letters and legal opinions reasonably satisfactory to the
Company, if such are requested by the Company). Subject to the provisions of
this Warrant with respect to compliance with the Securities Act 1933,

                                       6
<PAGE>

as amended (the "Act"), title to this Warrant may be transferred by the
endorsement (by the Holder executing the Assignment Form annexed hereto as
Exhibit B) and delivery in the same manner as a negotiable instrument
transferable by the endorsement and delivery. The Common Stock to be issued upon
exercise hereof, may not be transferred or assigned in whole or in part without
compliance with all applicable federal and state securities laws by the
transferor and the transferee (including the delivery of investment
representation letters and legal opinions reasonably satisfactory to the
Company, if such are requested by the Company)

         (c) EXCHANGE OF WARRANT UPON A TRANSFER. On surrender of this Warrant
for exchange, properly endorsed on the Assignment Form and subject to the
provisions of this Warrant with respect to compliance with the Act and with the
limitations on assignments and transfers and contained in this Section 7, the
Company at its exercise shall issue to or the order of the Holder a new warrant
or warrants of like tenor, in the name of the Holder or as the Holder (on
payment by the Holder of any applicable transfer taxes) may direct, for the
number of shares issuable upon exercise thereof.

         (d) COMPLIANCE WITH SECURITIES LAWS.

                  (i) The Holder of this Warrant, by acceptance hereof,
acknowledges that this Warrant and the shares of Common Stock to be issued upon
exercise hereof or conversion thereof being acquired solely for the Holder's own
account and not as a nominee for any other party, and for investment, and that
the Holder will not offer, sell or otherwise dispose of this Warrant or any
shares of Common Stock to be issued upon exercise hereof except under
circumstances that will not result in a violation of the Act or any state
securities laws. Upon exercise of this Warrant, the Holder shall, if requested
by the Company, confirm in writing, in a form satisfactory to the Company, that
the shares of Common Stock so purchased are being acquired solely for the
Holder's own account and not as a nominee for any other party, for investment,
and not with a view toward distribution or resale.

                  (ii) This Warrant and all shares of Common Stock issued upon
exercise hereof shall, unless registered under the Act, be stamped or imprinted
with a legend in substantially the following form (in addition to any legend
required by the State securities laws):

         THE SECURITIES PRESENTED HEREBY HAVE BEEN ACUIRED FOR
         INVESTMENT AND HAVE NOT BEEN REGISTED UNDER THE SECURITIES
         ACT OF

                                  7
<PAGE>

         1933, AS AMENDED. SUCH SECURITIES AND ANY SECURITIES OR
         SHARES ISSED HEREUNDER OR THEREUNDER MAY NOT BE SOLD OR
         TRANSFERRED IN THE ABSENCE OF SUCH REGISTRATION OR EXEPTION
         THEREFORM UNDER SAID ACT. COPIES OF THE AGREEMENT COVERING
         THE PURCHASE OF THESE SECURITIES AND RESTRICTING THEIR
         TRANSFER OR SALE MAY NE OBTAINED AT NO COST BY WRITTEN
         REQUEST MADE BY THE HOLDER OF RECORD HEREOF TO THE SECRETARY
         OF THE COMPANY AT THE PRINCIPAL EXECUTIVE OFFICES OF THE
         COMPANY.

         8.       RESERVATION OF STOCK. The company covenants that during the
                  Term of this Warrant is exercisable, the Company will reserve
                  from its authorized and unissued Common Stock a sufficient
                  number of shares to provide for the issuance of Common Sock
                  upon the exercise of this warrant, and from time to time, will
                  take all steps necessary to amend its Certificate of
                  Incorporation (the "Certificate") to provide sufficient
                  reserves of shares of Common Stock issuable upon exercise of
                  the Warrant. The Company further covenants that all shares may
                  be issued upon the exercise of rights represented by this
                  Warrant, upon exercise of the rights represented by this
                  Warrant and payment of the Exercise Price, all as set forth
                  herein, will be in free from all taxes, liens and charges in
                  respect of the issue thereof (other than taxes in respect of
                  any transfer occurring contemporaneously or otherwise
                  specified herein). The Company agrees that its issuance of
                  this Warrant shall constitute full authority to its officers
                  who are in charged with the duty of executing stock
                  certificates to execute and issue the necessary certificates
                  for shares of Common Stock upon the exercise of this Warrant.

         9.       NOTICES.

         (a) Whenever the Exercise Price or number of shares purchasable
hereunder shall be adjusted pursuant to Section 11 hereof, the Company shall
issue a certificate signed by its Treasurers setting forth, in reasonable
detail, the event requiring the adjustment, the amount of the adjustment, the
method by which such adjustment was calculated and the Exercise Price and number
of shares purchasable hereunder after giving effect to such adjustment. And
shall cause a copy of such certificate to be mailed (by first class mail,
postage prepaid) to the Holder of this Warrant.

         (b) In case

                  (i) The Company shall take a record of the holders of its
Common Stock (or other stock or securities at the time receivable upon the
exercise of this Warrant) for the purposes of entitling them to receive any
dividend or other distribution, or any right to subscribe for or purchase any
shares of stock of any class or any other securities, or to

                                       8
<PAGE>

receive any other right, or

                  (ii) of any reclassification of the capital stock of the
Company, any consolidation or merger of the Company with or into another
corporation, or any conveyance of all or subsequently all the assets of the
Company to another incorporation, or

                  (iii) of any voluntary dissolution, liquidation of winding-up
of this Company,

then, and in each such case, the Company will mail or cause to mail the Holder
or Holders a notice specifying, as the case may be (A) the date on which a
record is to be taken for the purpose of such dividend, distribution or right
and stating the amount and character of such dividend distribution or right, or
(B) the date on which such reorganization, reclassification, consolidation
merger, conveyance dissolution, liquidation or winding-up is to take place, and
the time, if any is to be fixed, as of which the holders of record of Common
Stock (or such stock or securities at the time receivable upon the exercise of
this Warrant) shall be entitled to exchange their shares of Common Stock (or
such other stock or securities) for securities or other property deliverable
upon such reorganization, reclassification, consolidation, merger, conveyance,
dissolution, liquidation or winding-up. Such notice shall be mailed at least 10
days prior to the date therein specified.

         (c) All such notices, advices and communications shall be deemed to
have been received (i) in the case of personal delivery, on the date of such
delivery and (ii) in the case of mailing, on the third (3) business day
following the date of such mailing.

         10.      AMENDMENTS.

         (a) Any term of this Warrant may be amended with the written consent of
the Company and the Holder.

         (b) No waivers of or exceptions to any term, condition or provision of
this Warrant, in any one or more instances, shall be deemed to be, or construed,
a further or continuing waiver of any such term, condition, or provision.

         11.      ADJUSTMENTS. The exercise Price and the number of shares
                  purchasable hereunder are subject to adjustment from time to
                  time as follows:

         11.1 MERGER RECLASSIFICATION, ETC. If the Company at any time while
this Warrant or any portion thereof, remains outstanding and unexpired shall, by
merger, consolidation, reclassification of securities or otherwise, change any
of the securities as to which purchase rights under this Warrant exists into the
same or a different number of securities of any other class or classes this
Warrant shall thereafter represent the right to acquire such number and kind of
securities which were subject to the purchase rights under this Warrant
immediately prior to such merger, consolidation, reclassification or other
change and the Exercise Price therefore shall be approximately adjusted, all
subject

                                       9
<PAGE>

to further adjustment as provided in Section II.

         11.2 SPLIT, SUBDIVISION OF COMBINATION OF SHARES. If the Company at any
time while this warrant, or any portion thereof, remains outstanding and
unexpired shall split, subdivided or combine the securities as to which purchase
rights under this Warrant exist, into a different number of securities of the
same class, the Exercise Price for such securities shall be proportionately
decreased in the case of a split or subdivision or proportionately increased in
the case of combination.

         11.3 CERTIFICATE AS TO ADJUSTMENTS. Upon the occurrence of each
adjustment or readjustment pursuant to this Section 11, the Company at its
expense shall promptly compute such adjustment in accordance with the terms
hereof and furnish to each holder of this Warrant a certificate setting forth
such adjustment or readjustment and showing in detail the facts upon which such
adjustment and readjustment is based. The Company shall, upon written request,
at any time, of any such holder, furnish or cause to be furnished to such holder
a like certificate setting forth: (i) such adjustments and readjustments; (ii)
the Exercise Price at the time in effect and; (iii) the number of shares and the
amount, if any, of other property which at the time would be received upon the
exercise of the Warrant.

         11.5 NO IMPAIRMENT, The Company will not, by any voluntary action,
avoid or seek to avoid the observance or performance of any of the terms to be
observed or performed hereunder by the Company, but will at all times in good
faith assist in the carrying out of all the provisions of this Section 11 and in
the taking of all of such action as may be necessary or appropriate in order to
protect the rights of the holders of this Warrant against impairment.

         12.      MISCELLANEOUS.

         12.1 AMENDMENTS OF WAIVER. Except as otherwise provided herein, the
provisions of the Warrants may be amended and the Company may take any action
herein prohibited, or omit to perform any act herein required to be performed by
it, only if the Company has obtained the written consent of the Holder.

         12.2 NOTICES. Any notices required to be sent to a Holder will be
delivered to the address of such Holder shown on the books of the Company. All
notices referred to herein will be delivered in person or sent by first class
mail, postage prepaid and will be deemed to have been given when so delivered or
sent.

         12.3 DESCRIPTIVE HEADINGS: GOVERNING LAW. The descriptive heading of
the paragraphs of this Warrant are inserted for convenience only and do not
constitute a pat of this Warrant. The construction, validity and interpretation
of this Warrant will be governed by the laws of the States of Delaware, without
regard to principals of conflicts or choice of law.

<PAGE>

IN WITNESS WHEREOF, CELERITY SYSTEMS, INC. caused this Warrant to be executed by
its officers thereunto duly authorized.

Dated: September 30, 1999

                                             CELERITY SYSTEMS, INC.

                                             By: /s/ Kenneth D. Van Meter
                                             Title: President & CEO

AGREED AND ACCEPTED:

HOLDER:

        By:
        Title:

<PAGE>

                              EXHIBIT A

                       FORM OF NOTICE OF EXERCISE

To:     CELERITY SYSTEMS, INC.

         (1) The undersigned hereby elects to purchase shares of Common Stock of
CELERITY SYSTEMS, INC. pursuant to the terms of the attached Warrant, and
tenders herewith payments of the purchase price for such shares in full.

         (2) In exercising this Warrant, the undersigned hereby confirms and
acknowledges that the shares of Common Stock are being acquired solely for the
account of the undersigned and not as a nominee for any other party, and for
investment, and that the undersigned will not offer, sell, or otherwise dispose
of any such shares of Common Stock except under circumstances that will not
result in a violation of the Securities Act of 1933, as amended, or any state
securities laws.

         (3) Please issue a certificate or certificates presenting said shares
of Common Stock in the name of the undersigned or in such other name as is
specified below:

                                           Name

                                           Name

         (4) Please issue a new Warrant for the unexercised portion of the
attached Warrant in the name of the undersigned or in such other name as
specified below.

                                           Name

                                           Name

<PAGE>

                                    EXHIBIT B

                            FORM OF ASSIGNEMENT FORM

FOR VALUE RECEIVED, the undersigned registered owner of this Warrant hereby
sells, assigns and transfers unto the Assignee names below all of the rights of
the undersigned under the within Warrant, with respect to the number of shares
of Common Stock set forth below but not below

Name of Assignee              Address                No. of Shares

And does hereby irrevocably constitute and appoint
Attorney to make such transfer on the books of CELERITY SYSTEMS, INC. maintained
for the purpose with full power of substitution in the premises.

The undersigned also represents that, by assignment hereof, the Assignee
acknowledges that this Warrant and the shares of stock to be issued upon
exercise hereof or conversion thereof are being acquired for investment and that
the Assignee will not offer, sell or otherwise dispose of this Warrant or any
shares of stock to be issued upon exercise hereof or conversion thereof except
under circumstances which will not result in a violation of the Securities Act
1933, as amended, or any state securities laws. Further, the Assignee has
acknowledged that upon exercise of this Warrant, the Assignee shall, if
requested by the Company, confirm in writing, in a form satisfactory to the
Company, that the shares of stock so purchased are being acquired for investment
and not with a view toward distribution or resale.

DATED:
                                                     Signature of Holder

                                                     Witness

<PAGE>

No. W-10      Warrant to Purchase Fifty Thousand (50,000) Shares of
                     Common Stock of Celerity Systems, Inc.
                             (Subject to adjustment)

Date of Issuance - As of September 30, 1999

                                     WARRANT

THIS WARRANT HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS
AMENDED, AND MAY NOT BE SOLD, OFFERED FOR SALE, PLEDGED OR HYOTHOCATED IN THE
ABSENCE OF A REGISTERATION STATEMENT IN EFFECT WITH RESPECT TO THE SECURITIES
UNDER SUCH ACT OR AN OPINION OF COUNSEL SATISFACTORY TO THE COMPANY THAT SUCH
REGISTRATION IS NOT REQUIRIED.

                        WARRANT TO PURCHASE COMMON STOCK

                                       of

                             CELERITY SYSTEMS, INC.

         This certifies that, for value received, Hunter Singer, or its
registered assigns ("Holder") is entitled, subject to the terms set forth below,
to purchase from CELERITY SYSTEMS, INC., a Delaware corporation (the "Company"),
Fifty Thousand (50,000) shares of common stock of the Company, as constituted on
the date hereof (the "Warrant Issue Date"), upon surrender hereof, at the
principal office of the Company referred to below, with the subscription form
attached hereto duly executed, and simultaneous payment of the exercise price
(the "Exercise Price") therefore, as set forth in Sections 2 and 3 below. The
number, character and Exercise Price of such shares of Common Stock are subject
to adjustment as provided below. The term "Warrant" as used herein shall include
the Warrant and any warrants delivered in substitution or exchange therefore as
provided herein.

         1..      TERM OF WARRANT. Subject to the terms and conditions set forth
                  herein, the Warrant shall be exercisable, in whole or in part,
                  during the term commencing as of September 30, 1999 and ending
                  5:00 p.m., Eastern Time September 29, 2002 and shall be void
                  thereafter (the "Term").

         2.       EXERCISE PRICE. The Exercise Price at which the Warrant may be
                  exercised shall be $0.586 per share of Common Stock, as
                  adjusted from time to time to pursuant to Section 11 hereof
                  (the "Exercise Price").

<PAGE>

         9.       EXERCISE OF WARRANT.

                  (a)      The purchase rights represented by the Warrant are
                           exercisable by the Holder in whole or in part, but
                           not for less than 100 shares at a time (or such
                           lesser number of shares which may then constitute the
                           maximum number purchasable; such number being subject
                           to adjustment as provided in Section 11 below), at
                           any time, or from time to time, during the Term
                           hereof as described in Section 1 above, by the
                           surrender of this warrant and Notice of Exercise
                           annexed hereto as EXHIBIT "A" duly completed and
                           executed on behalf of the Holder, at the office of
                           the Company (or such other office or agency of the
                           Company as it may designate by notice in writing to
                           the Holder at the address of the Holder appearing
                           on the books of the Company) upon payment in cash
                           or by check acceptable to the Company in an amount
                           equal to the product of the Exercise Price set
                           forth in Section 2 above multiplied by the number
                           of shares of common Stock being purchased upon such
                           exercise.

                  (b)      This Warrant shall be deemed to have been exercised
                           immediately prior to the close of business on the
                           date of its surrender for exercise as provided above,
                           and the person entitled to receive the shares of
                           Common Stock issuable upon such exercise shall be
                           treated for all purposes as the holder of record of
                           such shares as of the close of business on such date.
                           As promptly as practicable on or after such date and
                           in event within ten (10) days thereafter, the Company
                           as its expense shall issue and deliver to the person
                           or persons entitled to receive the same certificate
                           or certificates for the number of shares issuable
                           upon such exercise. In the event that this Warrant is
                           exercised in part, the Company at its expense will
                           execute and deliver a new Warrant of like tenor
                           exercisable for the number of shares for which this
                           warrant may then be exercised.

         4.       NO FACTIONAL SHARES OR SCRIP. No fractional shares or scrip
                  representing fractional shares shall be issued upon the
                  exercise of this warrant. In lieu of any fractional share to
                  which the Holder otherwise be entitled, the Company shall make
                  a cash payment equal to the Current Market value multiplied by
                  such fraction.

         Current Market Value of one share Common Stock shall mean:

         (1) If the common Stock is listed on national securities exchange or
admitted to unlisted trading privileges on such exchange or listed for trading
on the NASDAQ

<PAGE>

National Market system or Small cap system, the Current Market Value shall be
last reported sale price of the common Stock on such exchange or system on the
last business day prior to the date of exercise of this Warrant or if no such
sale is made on such day, the average closing bid and asked prices for such day
on such exchange or system or

         (2) If the common Stock is not so listed or admitted to unlisted
trading privileges, the current market value shall be the mean of the last
reported bid and asked prices reported by the NASDAQ Electronic Bulletin Board
or its then existing successor on the last business day prior to the date of the
exercise of this Warrant; or

         (3) If the Common Stock is not so listed or admitted to unlisted
trading privileges and bid and asked prices are not so reported, the Current
Market Value shall be an amount determined in such reasonable manner as may be
prescribed by the Board of Directors of the Company.

         5.       REPLACEMENT OF WARRANT. On receipt of evidence reasonably
                  satisfactory to the Company of the loss, theft, destruction,
                  or mutilation of this warrant and, in the case of loss, theft,
                  or destruction, on delivery of an indemnity agreement
                  reasonably satisfactory in form and substance to the Company
                  or, on the case of mutilation, on surrender and cancellation
                  of this Warrant, the Company at its expense shall execute and
                  deliver, in lieu of this Warrant, a new warrant of like tenor
                  and amount.

         6.       RIGHTS OF STOCKHOLDERS. This warrant shall not entitle the
                  Holder to any of the rights of a Stockholder of the Company.

         7.       TRANSFER WARRANT.

         (a) WARRANT REGISTER. The Company will maintain a register (the
"Warrant Register") containing the names and addresses of the Holder or Holders.
Any Holder of this Warrant or any portion thereof may change his address as
shown on the Warrant Register by written notice to the Company requesting such
change. Any notice or written communication required or permitted to be given by
mail to such Holder as shown on the Warrant Register and at the address shown on
the Warrant Register. Until this Warrant is transferred in the Warrant Register
of the Company, the Company may treat the holder as shown on the Warrant
Register as the absolute owner of this Warrant for all purposes, notwithstanding
any notice to the contrary.

         (b) TRANSFERABILITY AND NONNEGOTIABILITY OF WARRANT AND UNDERLYING
COMMON STOCK. This Warrant may be transferred or assigned in whole or in part
without compliance with all applicable federal and state securities laws by the
transferor and the transferee (including the delivery of investment
representation letters and legal opinions reasonably satisfactory to the
Company, if such are requested by the Company). Subject to the provisions of
this Warrant with respect to compliance with the Securities Act 1933,

<PAGE>

as amended (the "Act"), title to this Warrant may be transferred by the
endorsement (by the Holder executing the Assignment Form annexed hereto as
Exhibit B) and delivery in the same manner as a negotiable instrument
transferable by the endorsement and delivery. The Common Stock to be issued upon
exercise hereof, may not be transferred or assigned in whole or in part without
compliance with all applicable federal and state securities laws by the
transferor and the transferee (including the delivery of investment
representation letters and legal opinions reasonably satisfactory to the
Company, if such are requested by the Company)

         (c) EXCHANGE OF WARRANT UPON A TRANSFER. On surrender of this Warrant
for exchange, properly endorsed on the Assignment Form and subject to the
provisions of this Warrant with respect to compliance with the Act and with the
limitations on assignments and transfers and contained in this Section 7, the
Company at its exercise shall issue to or the order of the Holder a new warrant
or warrants of like tenor, in the name of the Holder or as the Holder (on
payment by the Holder of any applicable transfer taxes) may direct, for the
number of shares issuable upon exercise thereof.

         (d) COMPLIANCE WITH SECURITIES LAWS.

                  (i) The Holder of this Warrant, by acceptance hereof,
acknowledges that this Warrant and the shares of Common Stock to be issued upon
exercise hereof or conversion thereof being acquired solely for the Holder's own
account and not as a nominee for any other party, and for investment, and that
the Holder will not offer, sell or otherwise dispose of this Warrant or any
shares of Common Stock to be issued upon exercise hereof except under
circumstances that will not result in a violation of the Act or any state
securities laws. Upon exercise of this Warrant, the Holder shall, if requested
by the Company, confirm in writing, in a form satisfactory to the Company, that
the shares of Common Stock so purchased are being acquired solely for the
Holder's own account and not as a nominee for any other party, for investment,
and not with a view toward distribution or resale.

                  (ii) This Warrant and all shares of Common Stock issued upon
exercise hereof shall, unless registered under the Act, be stamped or imprinted
with a legend in substantially the following form (in addition to any legend
required by the State securities laws):

         THE SECURITIES PRESENTED HEREBY HAVE BEEN ACUIRED FOR
         INVESTMENT AND HAVE NOT BEEN REGISTED UNDER THE SECURITIES
         ACT OF

<PAGE>

         1933, AS AMENDED. SUCH SECURITIES AND ANY SECURITIES OR
         SHARES ISSED HEREUNDER OR THEREUNDER MAY NOT BE SOLD OR
         TRANSFERRED IN THE ABSENCE OF SUCH REGISTRATION OR EXEPTION
         THEREFORM UNDER SAID ACT. COPIES OF THE AGREEMENT COVERING
         THE PURCHASE OF THESE SECURITIES AND RESTRICTING THEIR
         TRANSFER OR SALE MAY NE OBTAINED AT NO COST BY WRITTEN
         REQUEST MADE BY THE HOLDER OF RECORD HEREOF TO THE SECRETARY
         OF THE COMPANY AT THE PRINCIPAL EXECUTIVE OFFICES OF THE
         COMPANY.

         8.       RESERVATION OF STOCK. The company covenants that during the
                  Term of this Warrant is exercisable, the Company will reserve
                  from its authorized and unissued Common Stock a sufficient
                  number of shares to provide for the issuance of Common Sock
                  upon the exercise of this warrant, and from time to time, will
                  take all steps necessary to amend its Certificate of
                  Incorporation (the "Certificate") to provide sufficient
                  reserves of shares of Common Stock issuable upon exercise of
                  the Warrant. The Company further covenants that all shares may
                  be issued upon the exercise of rights represented by this
                  Warrant, upon exercise of the rights represented by this
                  Warrant and payment of the Exercise Price, all as set forth
                  herein, will be in free from all taxes, liens and charges in
                  respect of the issue thereof (other than taxes in respect of
                  any transfer occurring contemporaneously or otherwise
                  specified herein). The Company agrees that its issuance of
                  this Warrant shall constitute full authority to its officers
                  who are in charged with the duty of executing stock
                  certificates to execute and issue the necessary certificates
                  for shares of Common Stock upon the exercise of this Warrant.

         9.       NOTICES.

         (a) Whenever the Exercise Price or number of shares purchasable
hereunder shall be adjusted pursuant to Section 11 hereof, the Company shall
issue a certificate signed by its Treasurers setting forth, in reasonable
detail, the event requiring the adjustment, the amount of the adjustment, the
method by which such adjustment was calculated and the Exercise Price and number
of shares purchasable hereunder after giving effect to such adjustment. And
shall cause a copy of such certificate to be mailed (by first class mail,
postage prepaid) to the Holder of this Warrant.

         (b) In case

                  (i) The Company shall take a record of the holders of its
Common Stock (or other stock or securities at the time receivable upon the
exercise of this Warrant) for the purposes of entitling them to receive any
dividend or other distribution, or any right to subscribe for or purchase any
shares of stock of any class or any other securities, or to

<PAGE>

receive any other right, or

                  (ii) of any reclassification of the capital stock of the
Company, any consolidation or merger of the Company with or into another
corporation, or any conveyance of all or subsequently all the assets of the
Company to another incorporation, or

                  (iii) of any voluntary dissolution, liquidation of winding-up
of this Company,

then, and in each such case, the Company will mail or cause to mail the Holder
or Holders a notice specifying, as the case may be (A) the date on which a
record is to be taken for the purpose of such dividend, distribution or right
and stating the amount and character of such dividend distribution or right, or
(B) the date on which such reorganization, reclassification, consolidation
merger, conveyance dissolution, liquidation or winding-up is to take place, and
the time, if any is to be fixed, as of which the holders of record of Common
Stock (or such stock or securities at the time receivable upon the exercise of
this Warrant) shall be entitled to exchange their shares of Common Stock (or
such other stock or securities) for securities or other property deliverable
upon such reorganization, reclassification, consolidation, merger, conveyance,
dissolution, liquidation or winding-up. Such notice shall be mailed at least 10
days prior to the date therein specified.

         (c) All such notices, advices and communications shall be deemed to
have been received (i) in the case of personal delivery, on the date of such
delivery and (ii) in the case of mailing, on the third (3) business day
following the date of such mailing.

         10.      AMENDMENTS.

         (a) Any term of this Warrant may be amended with the written consent of
the Company and the Holder.

         (b) No waivers of or exceptions to any term, condition or provision of
this Warrant, in any one or more instances, shall be deemed to be, or construed,
a further or continuing waiver of any such term, condition, or provision.

         11.      ADJUSTMENTS. The exercise Price and the number of shares
                  purchasable hereunder are subject to adjustment from time to
                  time as follows:

         11.1 MERGER RECLASSIFICATION, ETC. If the Company at any time while
this Warrant or any portion thereof, remains outstanding and unexpired shall, by
merger, consolidation, reclassification of securities or otherwise, change any
of the securities as to which purchase rights under this Warrant exists into the
same or a different number of securities of any other class or classes this
Warrant shall thereafter represent the right to acquire such number and kind of
securities which were subject

<PAGE>

to the purchase rights under this Warrant immediately prior to such merger,
consolidation, reclassification or other change and the Exercise Price therefore
shall be approximately adjusted, all subject to further adjustment as provided
in Section II.

         11.2 SPLIT, SUBDIVISION OF COMBINATION OF SHARES. If the Company at any
time while this warrant, or any portion thereof, remains outstanding and
unexpired shall split, subdivided or combine the securities as to which purchase
rights under this Warrant exist, into a different number of securities of the
same class, the Exercise Price for such securities shall be proportionately
decreased in the case of a split or subdivision or proportionately increased in
the case of combination.

         11.3 CERTIFICATE AS TO ADJUSTMENTS. Upon the occurrence of each
adjustment or readjustment pursuant to this Section 11, the Company at its
expense shall promptly compute such adjustment in accordance with the terms
hereof and furnish to each holder of this Warrant a certificate setting forth
such adjustment or readjustment and showing in detail the facts upon which such
adjustment and readjustment is based. The Company shall, upon written request,
at any time, of any such holder, furnish or cause to be furnished to such holder
a like certificate setting forth: (i) such adjustments and readjustments; (ii)
the Exercise Price at the time in effect and; (iii) the number of shares and the
amount, if any, of other property which at the time would be received upon the
exercise of the Warrant.

         11.6 NO IMPAIRMENT, The Company will not, by any voluntary action,
avoid or seek to avoid the observance or performance of any of the terms to be
observed or performed hereunder by the Company, but will at all times in good
faith assist in the carrying out of all the provisions of this Section 11 and in
the taking of all of such action as may be necessary or appropriate in order to
protect the rights of the holders of this Warrant against impairment.

         12.      MISCELLANEOUS.

         12.1 AMENDMENTS OF WAIVER. Except as otherwise provided herein, the
provisions of the Warrants may be amended and the Company may take any action
herein prohibited, or omit to perform any act herein required to be performed by
it, only if the Company has obtained the written consent of the Holder.

         12.2 NOTICES. Any notices required to be sent to a Holder will be
delivered to the address of such Holder shown on the books of the Company. All
notices referred to herein will be delivered in person or sent by first class
mail, postage prepaid and will be deemed to have been given when so delivered or
sent.

         12.3 DESCRIPTIVE HEADINGS: GOVERNING LAW. The descriptive heading of
the paragraphs of this Warrant are inserted for convenience only and do not
constitute a pat of this Warrant. The construction, validity and interpretation
of this Warrant will be governed by the laws of the States of Delaware, without
regard to principals of conflicts or choice of law.

<PAGE>

IN WITNESS WHEREOF, CELERITY SYSTEMS, INC. caused this Warrant to be executed by
its officers thereunto duly authorized.

Dated: September 30, 1999

                                             CELERITY SYSTEMS, INC.

                                             By: /s/ Kenneth D. Van Meter
                                             Title: President & CEO

AGREED AND ACCEPTED:

HOLDER:

        By:
        Title:

<PAGE>

                                    EXHIBIT A

                           FORM OF NOTICE OF EXERCISE

To:     CELERITY SYSTEMS, INC.

         (1) The undersigned hereby elects to purchase shares of Common Stock of
CELERITY SYSTEMS, INC. pursuant to the terms of the attached Warrant, and
tenders herewith payments of the purchase price for such shares in full.

         (2) In exercising this Warrant, the undersigned hereby confirms and
acknowledges that the shares of Common Stock are being acquired solely for the
account of the undersigned and not as a nominee for any other party, and for
investment, and that the undersigned will not offer, sell, or otherwise dispose
of any such shares of Common Stock except under circumstances that will not
result in a violation of the Securities Act of 1933, as amended, or any state
securities laws.

         (3) Please issue a certificate or certificates presenting said shares
of Common Stock in the name of the undersigned or in such other name as is
specified below:

                                                            Name

                                                            Name

         (4) Please issue a new Warrant for the unexercised portion of the
attached Warrant in the name of the undersigned or in such other name as
specified below.

                                                            Name

                                                            Name

<PAGE>

                                    EXHIBIT B

                            FORM OF ASSIGNEMENT FORM

FOR VALUE RECEIVED, the undersigned registered owner of this Warrant hereby
sells, assigns and transfers unto the Assignee names below all of the rights of
the undersigned under the within Warrant, with respect to the number of shares
of Common Stock set forth below but not below

Name of Assignee              Address                No. of Shares

And does hereby irrevocably constitute and appoint
Attorney to make such transfer on the books of CELERITY SYSTEMS, INC. maintained
for the purpose with full power of substitution in the premises.

The undersigned also represents that, by assignment hereof, the Assignee
acknowledges that this Warrant and the shares of stock to be issued upon
exercise hereof or conversion thereof are being acquired for investment and that
the Assignee will not offer, sell or otherwise dispose of this Warrant or any
shares of stock to be issued upon exercise hereof or conversion thereof except
under circumstances which will not result in a violation of the Securities Act
1933, as amended, or any state securities laws. Further, the Assignee has
acknowledged that upon exercise of this Warrant, the Assignee shall, if
requested by the Company, confirm in writing, in a form satisfactory to the
Company, that the shares of stock so purchased are being acquired for investment
and not with a view toward distribution or resale.

DATED:
                                                     Signature of Holder

                                                     Witness

<PAGE>

No. W-11      Warrant to Purchase Fifty Thousand (50,000) Shares of
                     Common Stock of Celerity Systems, Inc.
                             (Subject to adjustment)

Date of Issuance - As of September 30, 1999

                                     WARRANT

THIS WARRANT HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS
AMENDED, AND MAY NOT BE SOLD, OFFERED FOR SALE, PLEDGED OR HYOTHOCATED IN THE
ABSENCE OF A REGISTERATION STATEMENT IN EFFECT WITH RESPECT TO THE SECURITIES
UNDER SUCH ACT OR AN OPINION OF COUNSEL SATISFACTORY TO THE COMPANY THAT SUCH
REGISTRATION IS NOT REQUIRIED.

                        WARRANT TO PURCHASE COMMON STOCK

                                       of

                             CELERITY SYSTEMS, INC.

         This certifies that, for value received, Joe Donahue, or its registered
assigns ("Holder") is entitled, subject to the terms set forth below, to
purchase from CELERITY SYSTEMS, INC., a Delaware corporation (the "Company"),
Fifty Thousand (50,000) shares of common stock of the Company, as constituted on
the date hereof (the "Warrant Issue Date"), upon surrender hereof, at the
principal office of the Company referred to below, with the subscription form
attached hereto duly executed, and simultaneous payment of the exercise price
(the "Exercise Price") therefore, as set forth in Sections 2 and 3 below. The
number, character and Exercise Price of such shares of Common Stock are subject
to adjustment as provided below. The term "Warrant" as used herein shall include
the Warrant and any warrants delivered in substitution or exchange therefore as
provided herein.

         1.       TERM OF WARRANT. Subject to the terms and conditions set forth
                  herein, the Warrant shall be exercisable, in whole or in part,
                  during the term commencing as of September 30, 1999 and ending
                  5:00 p.m., Eastern Time September 29, 2002 and shall be void
                  thereafter (the "Term").

         2.       EXERCISE PRICE. The Exercise Price at which the Warrant may be
                  exercised shall be $0.586 per share of Common Stock, as
                  adjusted from time to time to pursuant to Section 11 hereof
                  (the "Exercise Price").

<PAGE>

         3.      EXERCISE OF WARRANT.

         (a) The purchase rights represented by the Warrant are exercisable by
the Holder in whole or in part, but not for less than 100 shares at a time (or
such lesser number of shares which may then constitute the maximum number
purchasable; such number being subject to adjustment as provided in Section 11
below), at any time, or from time to time, during the Term hereof as described
in Section 1 above, by the surrender of this warrant and Notice of Exercise
annexed hereto as EXHIBIT "A" duly completed and executed on ------- behalf of
the Holder, at the office of the Company (or such other office or agency of the
Company as it may designate by notice in writing to the Holder at the address of
the Holder appearing on the books of the Company) upon payment in cash or by
check acceptable to the Company in an amount equal to the product of the
Exercise Price set forth in Section 2 above multiplied by the number of shares
of common Stock being purchased upon such exercise.

         (b) This Warrant shall be deemed to have been exercised immediately
prior to the close of business on the date of its surrender for exercise as
provided above, and the person entitled to receive the shares of Common Stock
issuable upon such exercise shall be treated for all purposes as the holder of
record of such shares as of the close of business on such date. As promptly as
practicable on or after such date and in event within ten (10) days thereafter,
the Company as its expense shall issue and deliver to the person or persons
entitled to receive the same certificate or certificates for the number of
shares issuable upon such exercise. In the event that this Warrant is exercised
in part, the Company at its expense will execute and deliver a new Warrant of
like tenor exercisable for the number of shares for which this warrant may then
be exercised.

        4.     NO FACTIONAL SHARES OR SCRIP. No fractional shares or scrip
               representing fractional shares shall be issued upon the exercise
               of this warrant. In lieu of any fractional share to which the
               Holder otherwise be entitled, the Company shall make a cash
               payment equal to the Current Market value multiplied by such
               fraction.

        Current Market Value of one share Common Stock shall mean:

         (1) If the common Stock is listed on national securities exchange or
admitted to unlisted trading privileges on such exchange or listed for trading
on the NASDAQ

<PAGE>

National Market system or Small cap system, the Current Market Value shall be
last reported sale price of the common Stock on such exchange or system on the
last business day prior to the date of exercise of this Warrant or if no such
sale is made on such day, the average closing bid and asked prices for such day
on such exchange or system or

         (2) If the common Stock is not so listed or admitted to unlisted
trading privileges, the current market value shall be the mean of the last
reported bid and asked prices reported by the NASDAQ Electronic Bulletin Board
or its then existing successor on the last business day prior to the date of the
exercise of this Warrant; or

         (3) If the Common Stock is not so listed or admitted to unlisted
trading privileges and bid and asked prices are not so reported, the Current
Market Value shall be an amount determined in such reasonable manner as may be
prescribed by the Board of Directors of the Company.

         5.       REPLACEMENT OF WARRANT. On receipt of evidence reasonably
                  satisfactory to the Company of the loss, theft, destruction,
                  or mutilation of this warrant and, in the case of loss, theft,
                  or destruction, on delivery of an indemnity agreement
                  reasonably satisfactory in form and substance to the Company
                  or, on the case of mutilation, on surrender and cancellation
                  of this Warrant, the Company at its expense shall execute and
                  deliver, in lieu of this Warrant, a new warrant of like tenor
                  and amount.

         6.       RIGHTS OF STOCKHOLDERS. This warrant shall not entitle the
                  Holder to any of the rights of a Stockholder of the Company.

         7.       TRANSFER WARRANT.

         (a) WARRANT REGISTER. The Company will maintain a register (the
"Warrant Register") containing the names and addresses of the Holder or Holders.
Any Holder of this Warrant or any portion thereof may change his address as
shown on the Warrant Register by written notice to the Company requesting such
change. Any notice or written communication required or permitted to be given by
mail to such Holder as shown on the Warrant Register and at the address shown on
the Warrant Register. Until this Warrant is transferred in the Warrant Register
of the Company, the Company may treat the holder as shown on the Warrant
Register as the absolute owner of this Warrant for all purposes, notwithstanding
any notice to the contrary.

         (b) TRANSFERABILITY AND NONNEGOTIABILITY OF WARRANT AND UNDERLYING
COMMON STOCK. This Warrant may be transferred or assigned in whole or in part
without compliance with all applicable federal and state securities laws by the
transferor and the transferee (including the delivery of investment
representation letters and legal opinions reasonably satisfactory to the
Company, if such are requested by the Company). Subject to the provisions of
this Warrant with respect to compliance with the Securities Act 1933,

<PAGE>

as amended (the "Act"), title to this Warrant may be transferred by the
endorsement (by the Holder executing the Assignment Form annexed hereto as
Exhibit B) and delivery in the same manner as a negotiable instrument
transferable by the endorsement and delivery. The Common Stock to be issued upon
exercise hereof, may not be transferred or assigned in whole or in part without
compliance with all applicable federal and state securities laws by the
transferor and the transferee (including the delivery of investment
representation letters and legal opinions reasonably satisfactory to the
Company, if such are requested by the Company)

         (c) EXCHANGE OF WARRANT UPON A TRANSFER. On surrender of this Warrant
for exchange, properly endorsed on the Assignment Form and subject to the
provisions of this Warrant with respect to compliance with the Act and with the
limitations on assignments and transfers and contained in this Section 7, the
Company at its exercise shall issue to or the order of the Holder a new warrant
or warrants of like tenor, in the name of the Holder or as the Holder (on
payment by the Holder of any applicable transfer taxes) may direct, for the
number of shares issuable upon exercise thereof.

         (d) COMPLIANCE WITH SECURITIES LAWS.

                  (i) The Holder of this Warrant, by acceptance hereof,
acknowledges that this Warrant and the shares of Common Stock to be issued upon
exercise hereof or conversion thereof being acquired solely for the Holder's own
account and not as a nominee for any other party, and for investment, and that
the Holder will not offer, sell or otherwise dispose of this Warrant or any
shares of Common Stock to be issued upon exercise hereof except under
circumstances that will not result in a violation of the Act or any state
securities laws. Upon exercise of this Warrant, the Holder shall, if requested
by the Company, confirm in writing, in a form satisfactory to the Company, that
the shares of Common Stock so purchased are being acquired solely for the
Holder's own account and not as a nominee for any other party, for investment,
and not with a view toward distribution or resale.

                  (ii) This Warrant and all shares of Common Stock issued upon
exercise hereof shall, unless registered under the Act, be stamped or imprinted
with a legend in substantially the following form (in addition to any legend
required by the State securities laws):

         THE SECURITIES PRESENTED HEREBY HAVE BEEN ACUIRED FOR
         INVESTMENT AND HAVE NOT BEEN REGISTED UNDER THE SECURITIES
         ACT OF

<PAGE>

         1933, AS AMENDED. SUCH SECURITIES AND ANY SECURITIES OR
         SHARES ISSED HEREUNDER OR THEREUNDER MAY NOT BE SOLD OR
         TRANSFERRED IN THE ABSENCE OF SUCH REGISTRATION OR EXEPTION
         THEREFORM UNDER SAID ACT. COPIES OF THE AGREEMENT COVERING
         THE PURCHASE OF THESE SECURITIES AND RESTRICTING THEIR
         TRANSFER OR SALE MAY NE OBTAINED AT NO COST BY WRITTEN
         REQUEST MADE BY THE HOLDER OF RECORD HEREOF TO THE SECRETARY
         OF THE COMPANY AT THE PRINCIPAL EXECUTIVE OFFICES OF THE
         COMPANY.

         8.       RESERVATION OF STOCK. The company covenants that during the
                  Term of this Warrant is exercisable, the Company will reserve
                  from its authorized and unissued Common Stock a sufficient
                  number of shares to provide for the issuance of Common Sock
                  upon the exercise of this warrant, and from time to time, will
                  take all steps necessary to amend its Certificate of
                  Incorporation (the "Certificate") to provide sufficient
                  reserves of shares of Common Stock issuable upon exercise of
                  the Warrant. The Company further covenants that all shares may
                  be issued upon the exercise of rights represented by this
                  Warrant, upon exercise of the rights represented by this
                  Warrant and payment of the Exercise Price, all as set forth
                  herein, will be in free from all taxes, liens and charges in
                  respect of the issue thereof (other than taxes in respect of
                  any transfer occurring contemporaneously or otherwise
                  specified herein). The Company agrees that its issuance of
                  this Warrant shall constitute full authority to its officers
                  who are in charged with the duty of executing stock
                  certificates to execute and issue the necessary certificates
                  for shares of Common Stock upon the exercise of this Warrant.

         9.       NOTICES.

         (a) Whenever the Exercise Price or number of shares purchasable
hereunder shall be adjusted pursuant to Section 11 hereof, the Company shall
issue a certificate signed by its Treasurers setting forth, in reasonable
detail, the event requiring the adjustment, the amount of the adjustment, the
method by which such adjustment was calculated and the Exercise Price and number
of shares purchasable hereunder after giving effect to such adjustment. And
shall cause a copy of such certificate to be mailed (by first class mail,
postage prepaid) to the Holder of this Warrant.

         (b) In case

                  (i) The Company shall take a record of the holders of its
Common Stock (or other stock or securities at the time receivable upon the
exercise of this Warrant) for the purposes of entitling them to receive any
dividend or other distribution, or any right to subscribe for or purchase any
shares of stock of any class or any other securities, or to

<PAGE>

receive any other right, or

                  (ii) of any reclassification of the capital stock of the
Company, any consolidation or merger of the Company with or into another
corporation, or any conveyance of all or subsequently all the assets of the
Company to another incorporation, or

                  (iii) of any voluntary dissolution, liquidation of winding-up
of this Company,

then, and in each such case, the Company will mail or cause to mail the Holder
or Holders a notice specifying, as the case may be (A) the date on which a
record is to be taken for the purpose of such dividend, distribution or right
and stating the amount and character of such dividend distribution or right, or
(B) the date on which such reorganization, reclassification, consolidation
merger, conveyance dissolution, liquidation or winding-up is to take place, and
the time, if any is to be fixed, as of which the holders of record of Common
Stock (or such stock or securities at the time receivable upon the exercise of
this Warrant) shall be entitled to exchange their shares of Common Stock (or
such other stock or securities) for securities or other property deliverable
upon such reorganization, reclassification, consolidation, merger, conveyance,
dissolution, liquidation or winding-up. Such notice shall be mailed at least 10
days prior to the date therein specified.

         (c) All such notices, advices and communications shall be deemed to
have been received (i) in the case of personal delivery, on the date of such
delivery and (ii) in the case of mailing, on the third (3) business day
following the date of such mailing.

         10.      AMENDMENTS.

         (a) Any term of this Warrant may be amended with the written consent of
the Company and the Holder.

         (b) No waivers of or exceptions to any term, condition or provision of
this Warrant, in any one or more instances, shall be deemed to be, or construed,
a further or continuing waiver of any such term, condition, or provision.

         11.      ADJUSTMENTS. The exercise Price and the number of shares
                  purchasable hereunder are subject to adjustment from time to
                  time as follows:

         11.1 MERGER RECLASSIFICATION, ETC. If the Company at any time while
this Warrant or any portion thereof, remains outstanding and unexpired shall, by
merger, consolidation, reclassification of securities or otherwise, change any
of the securities as to which purchase rights under this Warrant exists into the
same or a different number of securities of any other class or classes this
Warrant shall thereafter represent the right to acquire such number and kind of
securities which were subject

<PAGE>

to the purchase rights under this Warrant immediately prior to such merger,
consolidation, reclassification or other change and the Exercise Price therefore
shall be approximately adjusted, all subject to further adjustment as provided
in Section II.

         11.2 SPLIT, SUBDIVISION OF COMBINATION OF SHARES. If the Company at any
time while this warrant, or any portion thereof, remains outstanding and
unexpired shall split, subdivided or combine the securities as to which purchase
rights under this Warrant exist, into a different number of securities of the
same class, the Exercise Price for such securities shall be proportionately
decreased in the case of a split or subdivision or proportionately increased in
the case of combination.

         11.3 CERTIFICATE AS TO ADJUSTMENTS. Upon the occurrence of each
adjustment or readjustment pursuant to this Section 11, the Company at its
expense shall promptly compute such adjustment in accordance with the terms
hereof and furnish to each holder of this Warrant a certificate setting forth
such adjustment or readjustment and showing in detail the facts upon which such
adjustment and readjustment is based. The Company shall, upon written request,
at any time, of any such holder, furnish or cause to be furnished to such holder
a like certificate setting forth: (i) such adjustments and readjustments; (ii)
the Exercise Price at the time in effect and; (iii) the number of shares and the
amount, if any, of other property which at the time would be received upon the
exercise of the Warrant.

         11.4 NO IMPAIRMENT, The Company will not, by any voluntary action,
avoid or seek to avoid the observance or performance of any of the terms to be
observed or performed hereunder by the Company, but will at all times in good
faith assist in the carrying out of all the provisions of this Section 11 and in
the taking of all of such action as may be necessary or appropriate in order to
protect the rights of the holders of this Warrant against impairment.

         12.      MISCELLANEOUS.

         12.1 AMENDMENTS OF WAIVER. Except as otherwise provided herein, the
provisions of the Warrants may be amended and the Company may take any action
herein prohibited, or omit to perform any act herein required to be performed by
it, only if the Company has obtained the written consent of the Holder.

         12.2 NOTICES. Any notices required to be sent to a Holder will be
delivered to the address of such Holder shown on the books of the Company. All
notices referred to herein will be delivered in person or sent by first class
mail, postage prepaid and will be deemed to have been given when so delivered or
sent.

         12.3 DESCRIPTIVE HEADINGS: GOVERNING LAW. The descriptive heading of
the paragraphs of this Warrant are inserted for convenience only and do not
constitute a pat of this Warrant. The construction, validity and interpretation
of this Warrant will be governed by the laws of the States of Delaware, without
regard to principals of conflicts or choice of law.

<PAGE>

IN WITNESS WHEREOF, CELERITY SYSTEMS, INC. caused this Warrant to be executed by
its officers thereunto duly authorized.

Dated: September 30, 1999

                                             CELERITY SYSTEMS, INC.

                                             By: /s/ Kenneth D. Van Meter
                                             Title: President & CEO

AGREED AND ACCEPTED:

HOLDER:

        By:
        Title:

<PAGE>

                               EXHIBIT A

                      FORM OF NOTICE OF EXERCISE

To:     CELERITY SYSTEMS, INC.

         (1) The undersigned hereby elects to purchase shares of Common Stock of
CELERITY SYSTEMS, INC. pursuant to the terms of the attached Warrant, and
tenders herewith payments of the purchase price for such shares in full.

         (2) In exercising this Warrant, the undersigned hereby confirms and
acknowledges that the shares of Common Stock are being acquired solely for the
account of the undersigned and not as a nominee for any other party, and for
investment, and that the undersigned will not offer, sell, or otherwise dispose
of any such shares of Common Stock except under circumstances that will not
result in a violation of the Securities Act of 1933, as amended, or any state
securities laws.

         (3) Please issue a certificate or certificates presenting said shares
of Common Stock in the name of the undersigned or in such other name as is
specified below:

                                             Name

                                             Name

         (4) Please issue a new Warrant for the unexercised portion of the
attached Warrant in the name of the undersigned or in such other name as
specified below.

                                             Name

                                             Name

<PAGE>

                               EXHIBIT B

                       FORM OF ASSIGNEMENT FORM

FOR VALUE RECEIVED, the undersigned registered owner of this Warrant hereby
sells, assigns and transfers unto the Assignee names below all of the rights of
the undersigned under the within Warrant, with respect to the number of shares
of Common Stock set forth below but not below

Name of Assignee              Address                No. of Shares

And does hereby irrevocably constitute and appoint
Attorney to make such transfer on the books of CELERITY SYSTEMS, INC. maintained
for the purpose with full power of substitution in the premises.

The undersigned also represents that, by assignment hereof, the Assignee
acknowledges that this Warrant and the shares of stock to be issued upon
exercise hereof or conversion thereof are being acquired for investment and that
the Assignee will not offer, sell or otherwise dispose of this Warrant or any
shares of stock to be issued upon exercise hereof or conversion thereof except
under circumstances which will not result in a violation of the Securities Act
1933, as amended, or any state securities laws. Further, the Assignee has
acknowledged that upon exercise of this Warrant, the Assignee shall, if
requested by the Company, confirm in writing, in a form satisfactory to the
Company, that the shares of stock so purchased are being acquired for investment
and not with a view toward distribution or resale.

DATED:
                                                     Signature of Holder

                                                     Witness

<PAGE>

No. W-12    Warrant to Purchase Fifty Thousand (50,000) Shares of
                   Common Stock of Celerity Systems, Inc.
                          (Subject to adjustment)

Date of Issuance - As of September 30, 1999

                                     WARRANT

THIS WARRANT HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS
AMENDED, AND MAY NOT BE SOLD, OFFERED FOR SALE, PLEDGED OR HYOTHOCATED IN THE
ABSENCE OF A REGISTERATION STATEMENT IN EFFECT WITH RESPECT TO THE SECURITIES
UNDER SUCH ACT OR AN OPINION OF COUNSEL SATISFACTORY TO THE COMPANY THAT SUCH
REGISTRATION IS NOT REQUIRIED.

                        WARRANT TO PURCHASE COMMON STOCK

                                       of

                             CELERITY SYSTEMS, INC.

         This certifies that, for value received, Max Rockwell, or its
registered assigns ("Holder") is entitled, subject to the terms set forth below,
to purchase from CELERITY SYSTEMS, INC., a Delaware corporation (the "Company"),
Fifty Thousand (50,000) shares of common stock of the Company, as constituted on
the date hereof (the "Warrant Issue Date"), upon surrender hereof, at the
principal office of the Company referred to below, with the subscription form
attached hereto duly executed, and simultaneous payment of the exercise price
(the "Exercise Price") therefore, as set forth in Sections 2 and 3 below. The
number, character and Exercise Price of such shares of Common Stock are subject
to adjustment as provided below. The term "Warrant" as used herein shall include
the Warrant and any warrants delivered in substitution or exchange therefore as
provided herein.

         1.       TERM OF WARRANT. Subject to the terms and conditions set forth
                  herein, the Warrant shall be exercisable, in whole or in part,
                  during the term commencing as of September 30, 1999 and ending
                  5:00 p.m., Eastern Time September 29, 2002 and shall be void
                  thereafter (the "Term").

         2.       EXERCISE PRICE. The Exercise Price at which the Warrant may be
                  exercised shall be $0.586 per share of Common Stock, as
                  adjusted from time to time to pursuant to Section 11 hereof
                  (the "Exercise Price").

<PAGE>

         3.       EXERCISE OF WARRANT.

                  (a)      The purchase rights represented by the Warrant are
                           exercisable by the Holder in whole or in part, but
                           not for less than 100 shares at a time (or such
                           lesser number of shares which may then constitute the
                           maximum number purchasable; such number being subject
                           to adjustment as provided in Section 11 below), at
                           any time, or from time to time, during the Term
                           hereof as described in Section 1 above, by the
                           surrender of this warrant and Notice of Exercise
                           annexed hereto as EXHIBIT "A" duly completed and
                           executed on behalf of the Holder, at the office of
                           the Company (or such other office or agency of the
                           Company as it may designate by notice in writing to
                           the Holder at the address of the Holder appearing
                           on the books of the Company) upon payment in cash
                           or by check acceptable to the Company in an amount
                           equal to the product of the Exercise Price set
                           forth in Section 2 above multiplied by the number
                           of shares of common Stock being purchased upon such
                           exercise.

                  (b)      This Warrant shall be deemed to have been exercised
                           immediately prior to the close of business on the
                           date of its surrender for exercise as provided above,
                           and the person entitled to receive the shares of
                           Common Stock issuable upon such exercise shall be
                           treated for all purposes as the holder of record of
                           such shares as of the close of business on such date.
                           As promptly as practicable on or after such date and
                           in event within ten (10) days thereafter, the Company
                           as its expense shall issue and deliver to the person
                           or persons entitled to receive the same certificate
                           or certificates for the number of shares issuable
                           upon such exercise. In the event that this Warrant is
                           exercised in part, the Company at its expense will
                           execute and deliver a new Warrant of like tenor
                           exercisable for the number of shares for which this
                           warrant may then be exercised.

        4.     NO FACTIONAL SHARES OR SCRIP. No fractional shares or scrip
               representing fractional shares shall be issued upon the exercise
               of this warrant. In lieu of any fractional share to which the
               Holder otherwise be entitled, the Company shall make a cash
               payment equal to the Current Market value multiplied by such
               fraction.

         Current Market Value of one share Common Stock shall mean:

         (1) If the common Stock is listed on national securities
exchange or admitted to unlisted trading privileges on such exchange
or listed for trading on the NASDAQ

<PAGE>

National Market system or Small cap system, the Current Market Value shall be
last reported sale price of the common Stock on such exchange or system on the
last business day prior to the date of exercise of this Warrant or if no such
sale is made on such day, the average closing bid and asked prices for such day
on such exchange or system or

         (2) If the common Stock is not so listed or admitted to unlisted
trading privileges, the current market value shall be the mean of the last
reported bid and asked prices reported by the NASDAQ Electronic Bulletin Board
or its then existing successor on the last business day prior to the date of the
exercise of this Warrant; or

         (3) If the Common Stock is not so listed or admitted to unlisted
trading privileges and bid and asked prices are not so reported, the Current
Market Value shall be an amount determined in such reasonable manner as may be
prescribed by the Board of Directors of the Company.

                  5.       REPLACEMENT OF WARRANT. On receipt of evidence
                           reasonably satisfactory to the Company of the loss,
                           theft, destruction, or mutilation of this warrant
                           and, in the case of loss, theft, or destruction, on
                           delivery of an indemnity agreement reasonably
                           satisfactory in form and substance to the Company or,
                           on the case of mutilation, on surrender and
                           cancellation of this Warrant, the Company at its
                           expense shall execute and deliver, in lieu of this
                           Warrant, a new warrant of like tenor and amount.

                  6.       RIGHTS OF STOCKHOLDERS. This warrant shall not
                           entitle the Holder to any of the rights of a
                           Stockholder of the Company.

                  7.       TRANSFER WARRANT.

         (a) WARRANT REGISTER. The Company will maintain a register (the
"Warrant Register") containing the names and addresses of the Holder or Holders.
Any Holder of this Warrant or any portion thereof may change his address as
shown on the Warrant Register by written notice to the Company requesting such
change. Any notice or written communication required or permitted to be given by
mail to such Holder as shown on the Warrant Register and at the address shown on
the Warrant Register. Until this Warrant is transferred in the Warrant Register
of the Company, the Company may treat the holder as shown on the Warrant
Register as the absolute owner of this Warrant for all purposes, notwithstanding
any notice to the contrary.

         (b) TRANSFERABILITY AND NONNEGOTIABILITY OF WARRANT AND UNDERLYING
COMMON STOCK. This Warrant may be transferred or assigned in whole or in part
without compliance with all applicable federal and state securities laws by the
transferor and the transferee (including the delivery of investment
representation letters and legal opinions reasonably satisfactory to the
Company, if such are requested by the Company). Subject to the provisions of
this Warrant with respect to compliance with the Securities Act 1933,

<PAGE>

as amended (the "Act"), title to this Warrant may be transferred by the
endorsement (by the Holder executing the Assignment Form annexed hereto as
Exhibit B) and delivery in the same manner as a negotiable instrument
transferable by the endorsement and delivery. The Common Stock to be issued upon
exercise hereof, may not be transferred or assigned in whole or in part without
compliance with all applicable federal and state securities laws by the
transferor and the transferee (including the delivery of investment
representation letters and legal opinions reasonably satisfactory to the
Company, if such are requested by the Company)

         (c) EXCHANGE OF WARRANT UPON A TRANSFER. On surrender of this Warrant
for exchange, properly endorsed on the Assignment Form and subject to the
provisions of this Warrant with respect to compliance with the Act and with the
limitations on assignments and transfers and contained in this Section 7, the
Company at its exercise shall issue to or the order of the Holder a new warrant
or warrants of like tenor, in the name of the Holder or as the Holder (on
payment by the Holder of any applicable transfer taxes) may direct, for the
number of shares issuable upon exercise thereof.

         (d) COMPLIANCE WITH SECURITIES LAWS.

                  (i) The Holder of this Warrant, by acceptance hereof,
acknowledges that this Warrant and the shares of Common Stock to be issued upon
exercise hereof or conversion thereof being acquired solely for the Holder's own
account and not as a nominee for any other party, and for investment, and that
the Holder will not offer, sell or otherwise dispose of this Warrant or any
shares of Common Stock to be issued upon exercise hereof except under
circumstances that will not result in a violation of the Act or any state
securities laws. Upon exercise of this Warrant, the Holder shall, if requested
by the Company, confirm in writing, in a form satisfactory to the Company, that
the shares of Common Stock so purchased are being acquired solely for the
Holder's own account and not as a nominee for any other party, for investment,
and not with a view toward distribution or resale.

                  (ii) This Warrant and all shares of Common Stock issued upon
exercise hereof shall, unless registered under the Act, be stamped or imprinted
with a legend in substantially the following form (in addition to any legend
required by the State securities laws):

         THE SECURITIES PRESENTED HEREBY HAVE BEEN ACUIRED FOR
         INVESTMENT AND HAVE NOT BEEN REGISTED UNDER THE SECURITIES
         ACT OF

<PAGE>

         1933, AS AMENDED. SUCH SECURITIES AND ANY SECURITIES OR
         SHARES ISSED HEREUNDER OR THEREUNDER MAY NOT BE SOLD OR
         TRANSFERRED IN THE ABSENCE OF SUCH REGISTRATION OR EXEPTION
         THEREFORM UNDER SAID ACT. COPIES OF THE AGREEMENT COVERING
         THE PURCHASE OF THESE SECURITIES AND RESTRICTING THEIR
         TRANSFER OR SALE MAY NE OBTAINED AT NO COST BY WRITTEN
         REQUEST MADE BY THE HOLDER OF RECORD HEREOF TO THE SECRETARY
         OF THE COMPANY AT THE PRINCIPAL EXECUTIVE OFFICES OF THE
         COMPANY.

         8.       RESERVATION OF STOCK. The company covenants that during the
                  Term of this Warrant is exercisable, the Company will reserve
                  from its authorized and unissued Common Stock a sufficient
                  number of shares to provide for the issuance of Common Sock
                  upon the exercise of this warrant, and from time to time, will
                  take all steps necessary to amend its Certificate of
                  Incorporation (the "Certificate") to provide sufficient
                  reserves of shares of Common Stock issuable upon exercise of
                  the Warrant. The Company further covenants that all shares may
                  be issued upon the exercise of rights represented by this
                  Warrant, upon exercise of the rights represented by this
                  Warrant and payment of the Exercise Price, all as set forth
                  herein, will be in free from all taxes, liens and charges in
                  respect of the issue thereof (other than taxes in respect of
                  any transfer occurring contemporaneously or otherwise
                  specified herein). The Company agrees that its issuance of
                  this Warrant shall constitute full authority to its officers
                  who are in charged with the duty of executing stock
                  certificates to execute and issue the necessary certificates
                  for shares of Common Stock upon the exercise of this Warrant.

         9.       NOTICES.

         (a) Whenever the Exercise Price or number of shares purchasable
hereunder shall be adjusted pursuant to Section 11 hereof, the Company shall
issue a certificate signed by its Treasurers setting forth, in reasonable
detail, the event requiring the adjustment, the amount of the adjustment, the
method by which such adjustment was calculated and the Exercise Price and number
of shares purchasable hereunder after giving effect to such adjustment. And
shall cause a copy of such certificate to be mailed (by first class mail,
postage prepaid) to the Holder of this Warrant.

         (b) In case

                  (i) The Company shall take a record of the holders of its
Common Stock (or other stock or securities at the time receivable upon the
exercise of this Warrant) for the purposes of entitling them to receive any
dividend or other distribution, or any right to subscribe for or purchase any
shares of stock of any class or any other securities, or to

<PAGE>

receive any other right, or

                  (ii) of any reclassification of the capital stock of the
Company, any consolidation or merger of the Company with or into another
corporation, or any conveyance of all or subsequently all the assets of the
Company to another incorporation, or

                  (iii) of any voluntary dissolution, liquidation of winding-up
of this Company,

then, and in each such case, the Company will mail or cause to mail the Holder
or Holders a notice specifying, as the case may be (A) the date on which a
record is to be taken for the purpose of such dividend, distribution or right
and stating the amount and character of such dividend distribution or right, or
(B) the date on which such reorganization, reclassification, consolidation
merger, conveyance dissolution, liquidation or winding-up is to take place, and
the time, if any is to be fixed, as of which the holders of record of Common
Stock (or such stock or securities at the time receivable upon the exercise of
this Warrant) shall be entitled to exchange their shares of Common Stock (or
such other stock or securities) for securities or other property deliverable
upon such reorganization, reclassification, consolidation, merger, conveyance,
dissolution, liquidation or winding-up. Such notice shall be mailed at least 10
days prior to the date therein specified.

         (c) All such notices, advices and communications shall be deemed to
have been received (i) in the case of personal delivery, on the date of such
delivery and (ii) in the case of mailing, on the third (3) business day
following the date of such mailing.

         10.      AMENDMENTS.

         (a) Any term of this Warrant may be amended with the written consent of
the Company and the Holder.

         (b) No waivers of or exceptions to any term, condition or provision of
this Warrant, in any one or more instances, shall be deemed to be, or construed,
a further or continuing waiver of any such term, condition, or provision.

         11.      ADJUSTMENTS. The exercise Price and the number of shares
                  purchasable hereunder are subject to adjustment from time to
                  time as follows:

         11.1 MERGER RECLASSIFICATION, ETC. If the Company at any time while
this Warrant or any portion thereof, remains outstanding and unexpired shall, by
merger, consolidation, reclassification of securities or otherwise, change any
of the securities as to which purchase rights under this Warrant exists into the
same or a different number of securities of any other class or classes this
Warrant shall thereafter represent the right to acquire such number and kind of
securities which were subject

<PAGE>

to the purchase rights under this Warrant immediately prior to such merger,
consolidation, reclassification or other change and the Exercise Price therefore
shall be approximately adjusted, all subject to further adjustment as provided
in Section II.

         11.2 SPLIT, SUBDIVISION OF COMBINATION OF SHARES. If the Company at any
time while this warrant, or any portion thereof, remains outstanding and
unexpired shall split, subdivided or combine the securities as to which purchase
rights under this Warrant exist, into a different number of securities of the
same class, the Exercise Price for such securities shall be proportionately
decreased in the case of a split or subdivision or proportionately increased in
the case of combination.

         11.3 CERTIFICATE AS TO ADJUSTMENTS. Upon the occurrence of each
adjustment or readjustment pursuant to this Section 11, the Company at its
expense shall promptly compute such adjustment in accordance with the terms
hereof and furnish to each holder of this Warrant a certificate setting forth
such adjustment or readjustment and showing in detail the facts upon which such
adjustment and readjustment is based. The Company shall, upon written request,
at any time, of any such holder, furnish or cause to be furnished to such holder
a like certificate setting forth: (i) such adjustments and readjustments; (ii)
the Exercise Price at the time in effect and; (iii) the number of shares and the
amount, if any, of other property which at the time would be received upon the
exercise of the Warrant.

         11.4 NO IMPAIRMENT, The Company will not, by any voluntary action,
avoid or seek to avoid the observance or performance of any of the terms to be
observed or performed hereunder by the Company, but will at all times in good
faith assist in the carrying out of all the provisions of this Section 11 and in
the taking of all of such action as may be necessary or appropriate in order to
protect the rights of the holders of this Warrant against impairment.

         12.      MISCELLANEOUS.

         12.1 AMENDMENTS OF WAIVER. Except as otherwise provided herein, the
provisions of the Warrants may be amended and the Company may take any action
herein prohibited, or omit to perform any act herein required to be performed by
it, only if the Company has obtained the written consent of the Holder.

         12.2 NOTICES. Any notices required to be sent to a Holder will be
delivered to the address of such Holder shown on the books of the Company. All
notices referred to herein will be delivered in person or sent by first class
mail, postage prepaid and will be deemed to have been given when so delivered or
sent.

         12.3 DESCRIPTIVE HEADINGS: GOVERNING LAW. The descriptive heading of
the paragraphs of this Warrant are inserted for convenience only and do not
constitute a pat of this Warrant. The construction, validity and interpretation
of this Warrant will be governed by the laws of the States of Delaware, without
regard to principals of conflicts or choice of law.

<PAGE>

IN WITNESS WHEREOF, CELERITY SYSTEMS, INC. caused this Warrant to be executed by
its officers thereunto duly authorized.

Dated: September 30, 1999

                                             CELERITY SYSTEMS, INC.

                                             By: /s/ Kenneth D. Van Meter
                                             Title: President & CEO

AGREED AND ACCEPTED:

HOLDER:

        By:
        Title:

<PAGE>

                                    EXHIBIT A

                           FORM OF NOTICE OF EXERCISE

To:     CELERITY SYSTEMS, INC.

         () The undersigned hereby elects to purchase shares of Common Stock of
CELERITY SYSTEMS, INC. pursuant to the terms of the attached Warrant, and
tenders herewith payments of the purchase price for such shares in full.

         (2) In exercising this Warrant, the undersigned hereby confirms and
acknowledges that the shares of Common Stock are being acquired solely for the
account of the undersigned and not as a nominee for any other party, and for
investment, and that the undersigned will not offer, sell, or otherwise dispose
of any such shares of Common Stock except under circumstances that will not
result in a violation of the Securities Act of 1933, as amended, or any state
securities laws.

         (3) Please issue a certificate or certificates presenting said shares
of Common Stock in the name of the undersigned or in such other name as is
specified below:

                                             Name

                                             Name

(4) Please issue a new Warrant for the unexercised portion of the attached
Warrant in the name of the undersigned or in such other name as specified below.

                                             Name

                                             Name

<PAGE>

                                    EXHIBIT B

                            FORM OF ASSIGNEMENT FORM

FOR VALUE RECEIVED, the undersigned registered owner of this Warrant hereby
sells, assigns and transfers unto the Assignee names below all of the rights of
the undersigned under the within Warrant, with respect to the number of shares
of Common Stock set forth below but not below

Name of Assignee              Address                No. of Shares

And does hereby irrevocably constitute and appoint
Attorney to make such transfer on the books of CELERITY SYSTEMS, INC. maintained
for the purpose with full power of substitution in the premises.

The undersigned also represents that, by assignment hereof, the Assignee
acknowledges that this Warrant and the shares of stock to be issued upon
exercise hereof or conversion thereof are being acquired for investment and that
the Assignee will not offer, sell or otherwise dispose of this Warrant or any
shares of stock to be issued upon exercise hereof or conversion thereof except
under circumstances which will not result in a violation of the Securities Act
1933, as amended, or any state securities laws. Further, the Assignee has
acknowledged that upon exercise of this Warrant, the Assignee shall, if
requested by the Company, confirm in writing, in a form satisfactory to the
Company, that the shares of stock so purchased are being acquired for investment
and not with a view toward distribution or resale.

DATED:
                                                     Signature of Holder

                                                     Witness<PAGE>

                                                                   EXHIBIT 10.1

                                                               February 15, 2000

Acqua Wellington North American Equities Fund Limited
c/o MeesPierson Fund Services (Bahamas) Ltd.
Montague Sterling Centre
East Bay Street, P.O. Box SS-6238
Nassau, Bahamas

Dear Sirs:

         This letter sets forth the agreement of Acqua Wellington North American
Equities Fund Limited (the "Purchaser") and Tegal Corporation (the "Company")
regarding the purchase by the Purchaser from the Company of the Company's common
stock (the "Common Stock") on the date hereof. The parties agree as follows:

1.                This Agreement relates to the purchase by the Purchaser of
         849,514 shares of the Company's Common Stock (the "Shares") for an
         aggregate purchase price of $5,029,982, which purchase is being
         settled by the parties on the date hereof.

2.                The Company is a corporation duly incorporated, validly
         existing and in good standing under the laws of Delaware. The Company
         has the requisite corporate power and authority to enter into and
         perform this Agreement and to issue and sell the Shares in accordance
         with the terms hereof. The execution, delivery and performance of this
         Agreement by the Company and the consummation by it of the transactions
         contemplated hereby have been duly and validly authorized by all
         necessary corporate action. A copy of the duly executed resolutions of
         the Board of Directors of the Company is attached hereto as Exhibit
         "B". This Agreement has been duly executed and delivered on behalf of
         the Company by a duly authorized officer. A copy of a duly executed
         incumbency certificate of the Company's duly authorized officers is
         attached hereto as Exhibit "C". This Agreement (assuming its due
         execution and delivery by the other party hereto) constitutes, or shall
         constitute when executed and delivered, a valid and binding obligation
         of the Company enforceable against the Company in accordance with its
         terms, subject to the effects of bankruptcy, insolvency, fraudulent
         conveyance, reorganization, moratorium and other similar laws relating
         to or affecting creditors' rights generally and general equitable
         principles (whether considered in a proceeding in equity or at law).

3.                The Shares to be issued under this Agreement have been duly
         authorized by all necessary corporate action and, when paid for or
         issued in accordance with the terms hereof, the Shares shall be validly
         issued, fully paid and nonassessable.

4.                The Company represents and warrants that (a) the Company has
         filed with the Securities and Exchange Commission (the "Commission")
         pursuant to Rule 415 under

<PAGE>

         the Securities Act of 1933, as amended (the "Securities Act"), a
         registration statement on Form S-3, Commission File Number
         333-94093 (such registration statement, as amended when it became
         effective on January 10, 2000 under the Securities Act, shall be
         referred to hereinafter as the "Registration Statement"); (b) the
         Company has filed a prospectus supplement to the Registration
         Statement in connection with this transaction; and (c) the Shares
         are registered under the Registration Statement. Copies of the
         Registration Statement and the Prospectus Supplement, each as filed
         (and declared effective, if applicable) by the Securities and
         Exchange Commission, are annexed hereto as Exhibits "D" and "E",
         respectively.

5.                As of February 14, 2000 neither Purchaser or its
         affiliates hold any securities of the Company.

6.                The Company will continue to take all reasonable action
         necessary to continue the listing or trading of its Common Stock on the
         NASDAQ National Market or any relevant market or system, if applicable,
         and will comply in all material respects with the Company's reporting,
         listing (including, without limitation, the listing of the Shares
         purchased by the Purchaser) or other obligations under the rules of the
         NASDAQ National Market or any relevant market or system.

7.                The Company has filed with the Commission all reports, forms,
         registration statements, definitive proxy statements and documents
         required to be filed with the SEC since March 31, 1997 (the "Commission
         Filings"). The Company has delivered or made available to the Purchaser
         true and complete copies of the Commission Filings. As of their
         respective dates, each of the Commission Filings complied in all
         material respects with the requirements of the Securities Exchange Act
         of 1934 (the "Exchange Act") and the rules and regulations of the
         Commission promulgated thereunder, and, as of their respective dates,
         none of the Commission Filings referred to above contained any untrue
         statement of a material fact or omitted to state a material fact
         required to be stated therein or necessary in order to make the
         statements therein, in light of the circumstances under which they were
         made, not misleading. Each of the consolidated balance sheets of the
         Company included in or incorporated by reference into the Commission
         Filings (including the related notes and schedules) presents fairly the
         consolidated financial position of the Company and its consolidated
         subsidiaries as of its date, and each of the consolidated statements of
         income, retained earnings and cash flows of the Company included in or
         incorporated by reference into the Commission Filings (including any
         related notes and schedules) presents fairly the results of operations,
         retained earnings or case flows, as the case may be, of the Company and
         its subsidiaries for the periods set forth therein (subject, in the
         case of unaudited statements, to normal year-end audit adjustments), in
         each case in accordance with GAAP consistently applied during the
         periods involved, except as may be noted therein.

8.                The Company will promptly notify the Purchaser of (a) any stop
         order or other suspension of the effectiveness of the Registration
         Statement and (b) the happening of

<PAGE>

         any event as a result of which the prospectus included in the
         Registration Statement includes an untrue statement of a material fact
         or omits to state a material fact required to be stated therein, or
         necessary to make the statements therein, in light of the circumstances
         under which they were made, not misleading.

9.                Except as otherwise required by applicable law or requirements
         of any stock exchange or NASDAQ, as applicable, the Company may not
         issue a press release or otherwise make a public statement or
         announcement with respect to the completion of the transaction
         contemplated hereby without the prior consent of the Purchaser, which
         shall not be unreasonably withheld.

10.               The Company and the Purchaser will indemnify the other party
         as provided in Exhibit "A" attached hereto. For purposes of said
         Exhibit A, capitalized terms used therein without definition shall have
         the same meanings therein as are ascribed to said terms in this
         Agreement.

11.               This Agreement shall be governed and construed in accordance
         with the substantive laws of the State of New York without giving
         effect to the conflicts of law principles thereunder. This Agreement
         constitutes the entire agreement between the parties with respect to
         the subject matter hereof and supersedes all prior agreements and
         undertakings, both written and oral, among the parties, or any of them,
         with respect to the subject matter hereof. This Agreement may be
         executed in two or more counterparts, and by the different parties
         hereto in separate counterparts, each of which when executed shall be
         deemed to be an original but all of which taken together shall
         constitute one and the same agreement.

12.               The Purchaser has the requisite power and authority to enter
         into and perform this Agreement and to purchase the Shares. The
         execution, delivery and performance of this Agreement by Purchaser and
         the consummation by it of the transactions contemplated hereby have
         been duly authorized by all necessary action. This agreement
         constitutes, or shall constitute when executed and delivered, a valid
         and binding obligation of the Purchaser enforceable against the
         Purchaser in accordance with its terms, subject to the effects of
         bankruptcy, insolvency, fraudulent conveyance, reorganization,
         moratorium and other similar laws relating to or affecting creditors'
         rights generally and general equitable principles (whether considered
         in a proceeding in equity or at law).

13.               If any provision of this Agreement shall be invalid or
         unenforceable in any jurisdiction, such invalidity or unenforceability
         shall not affect the validity or enforceability of the remainder of
         this Agreement in that jurisdiction or the validity or enforceability
         of any provision of this Agreement in any other jurisdiction.

14.               No provision of this Agreement may be amended other than by an
         instrument in writing signed by the Company and the Purchaser and no
         provision hereof may be

                                      -3-

<PAGE>

         waived other than by an instrument in writing signed by the party
         against whom enforcement is sought.

         Delivery of an executed copy of a signature page to this Agreement by
facsimile transmission shall be effective as delivery of a manually executed
copy of this Agreement and shall be effective and enforceable as the original.

         Please execute a copy of this letter which, when executed by the
Purchaser, will constitute an Agreement between the Company and the Purchaser.

                                                    Very truly yours,

                                                    TEGAL CORPORATION

                                                    By:___________________
                                                    Name:
                                                    Title:

AGREED TO:

PURCHASER:

ACQUA WELLINGTON NORTH AMERICAN
     EQUITIES FUND LIMITED

By:_____________________________
Name:
Title:

                                      -4-

<PAGE>

                                   EXHIBIT 'A'

                            TERMS OF INDEMNIFICATION

(a)      INDEMNIFICATION BY THE COMPANY. The Company will indemnify and hold
         harmless the Purchaser and each person, if any, who controls the
         Purchaser within the meaning of Section 15 of the Securities Act of
         1933, as amended (the "Securities Act"); or Section 20(a) of the
         Securities Exchange Act, as amended (the "Exchange Act"); from and
         against any losses, claims, damages, liabilities, costs and expenses
         (including, without limitation, reasonable costs of defense and
         investigation and all attorneys' fees and expenses) to which the
         Purchaser and each person, if any, who controls the Purchaser may
         become subject, under the Securities Act or otherwise, insofar as such
         losses, claims, damages, liabilities and expenses (or actions in
         respect thereof) arise out of or are based upon (i) any untrue
         statement or alleged untrue statement of a material fact contained, or
         incorporated by reference, in the Registration Statement relating to
         Shares being sold to the Purchaser (including the prospectus dated
         January 10, 2000, the prospectus supplement dated February 15, 2000
         (the "Prospectus Supplement") which are a part of the Registration
         Statement), or any amendment or supplement to the Registration
         Statement, or (ii) the omission or alleged omission to state in that
         Registration Statement or any document incorporated by reference in the
         Registration Statement, a material fact required to be stated therein
         or necessary to make the statements therein not misleading, except
         insofar as such losses, claims, damages, liabilities, costs and
         expenses are caused by any such untrue statement or omission or alleged
         untrue statement or omission of material fact so made in reliance upon
         and in conformity with information furnished in writing to the Company
         by the Purchaser or on the Purchaser's behalf expressly for inclusion
         therein (an "Indemnifiable Matter").

         The indemnifying party will reimburse the indemnified party and each
         such controlling person promptly upon demand for any legal or other
         costs or expenses reasonably incurred by the indemnified party or the
         controlling person in investigating, defending against, or preparing to
         defend against any claim relating to the applicable Indemnifiable
         Matter.

(b)      INDEMNIFICATION BY PURCHASER Purchaser agrees to indemnify and hold
         harmless the Company, its officers, directors and agents and each
         person, if any, who controls the Company within the meaning of either
         Section 15 of the Securities Act or Section 20 of the Exchange Act to
         the same extent as the foregoing indemnity from the Company to the
         Purchaser, but only with respect to information relating to the
         Purchaser furnished in writing by the Purchaser or with the Purchaser's
         authorization on the Purchaser's behalf expressly for use in any
         registration statement or prospectus relating to the Shares, or any
         amendment or supplement thereto.

                                      -5-

<PAGE>

(c)      INDEMNIFICATION PROCEDURES. Promptly after a person receives notice of
         a claim or the commencement of an action, suit or proceeding for which
         the person intends to seek indemnification under Paragraph (a), the
         person will notify the indemnifying party in writing of the claim or
         commencement of the action, suit or proceeding, but failure to notify
         the indemnifying party will not relieve the indemnifying party from
         liability under Paragraph (a), except to the extent the indemnifying
         party has been materially prejudiced by the failure to give notice. The
         indemnifying party will be entitled to participate in the defense of
         any claim, action, suit or proceeding as to which indemnification is
         being sought, or the indemnifying party may (but will not be required
         to) assume the defense against the claim, action, suit or proceeding
         with legal counsel chosen by the indemnifying party. After an
         indemnifying party notifies an indemnified party that the indemnifying
         party wishes to assume the defense of a claim, action, suit or
         proceeding the indemnifying party will not be liable for any legal or
         other expenses incurred by the indemnified party in connection with the
         defense against the claim, action, suit or proceeding, except that if,
         in the opinion of legal counsel to the indemnifying party, one or more
         of the indemnified parties should be separately represented in
         connection with a claim, action, suit or proceeding the indemnifying
         party will pay the reasonable fees and expenses of one separate counsel
         for the indemnified parties. Each indemnified party, as a condition
         precedent to receiving indemnification as provided in Paragraph (a),
         will, at the cost and expense of the indemnifying party, cooperate in
         all reasonable respects with the indemnifying party in the defense of
         the claim, action, suit or proceeding as to which indemnification is
         sought. No indemnifying party will be liable for any settlement of any
         claim, action, suit or proceeding effected without its prior written
         consent. No indemnifying party will, without the prior written consent
         of the indemnified party, effect any settlement of a pending or
         threatened claim, action or proceeding with respect which an
         indemnified party is, or is informed that it may be, made a party and
         for which it would be entitled to indemnification, unless the
         settlement includes an unconditional release of the indemnified party
         from all liability and claims which are the subject matter of the
         pending or threatened action other than financial obligations for which
         the indemnified party will be indemnified hereunder.

(d)      CONTRIBUTION. If for any reason the indemnification provided for in
         this Agreement is not available to, or is not sufficient to hold
         harmless, an indemnified party in respect of any loss, claim, damage,
         liability, cost or expense referred to in Paragraph (a), each
         indemnifying party will, in lieu of indemnifying the indemnified party,
         contribute to the amount paid or payable by the indemnified party, as a
         result of the loss, claim, damage, liability, cost or expense (i) in
         the proportion which is appropriate to reflect the relative benefits
         received by the indemnifying party, on the one hand, and by the
         indemnified party, on the other hand, from the sale of stock which is
         the subject of the claim, action, suit or proceeding which resulted in
         the loss, claim, liability, cost or expense or (ii) if that allocation
         is not permitted by applicable law, in such proportion as is
         appropriate to reflect not only the relative benefits of the sale of
         stock, but also the relative fault of the indemnifying party and the
         indemnified party with respect to the statements or omissions which are
         the subject of the claim, action, suit or proceeding that resulted in
         the loss,

                                      -6-

<PAGE>

         claim, damage, liability, cost or expense as well as any other relevant
         equitable considerations.

                                      -7-

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00001-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00001-of-00352.parquet"}]]