Document:

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                               EXCHANGE AGREEMENT

         EXCHANGE AGREEMENT dated as of the 31st day of January, 2001 (this
"Agreement") by and between DATAMETRICS CORPORATION, a Delaware corporation (the
"Corporation"), and DMTR, LLC, a New York limited liability company ("DMTR").

                              W I T N E S S E T H:

         WHEREAS, the Corporation and DMTR are parties to a Loan Agreement dated
the date hereof (the "Loan Agreement") pursuant to which DMTR has agreed to
provide certain financing to the Corporation; and

         WHEREAS, the Corporation is obligated to DMTR in respect of the Bridge
Notes, as such term is defined in the Loan Agreement; and

         WHEREAS, the Corporation and DMTR have agreed to exchange a certain
portion of the Bridge Notes for shares of the Corporation's common stock, par
value $.01 (the "Common Stock");

         NOW, THEREFORE, in consideration of the premises and mutual covenants
set forth herein and for other good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, DMTR and the Corporation agree as
follows:

         1. Exchange. DMTR hereby exchanges (the "Exchange") $700,000 in
principal amount of the Bridge Notes for the issuance by the Corporation
simultaneously with the execution and delivery of this Agreement of 700,000
shares of the Corporation's Common Stock (after giving effect to a proposed 1
for 20 reverse stock split). The parties acknowledge that effective upon the
Exchange, the outstanding principal amount of the Bridge Notes is $605,000.

         2. Registration Rights Agreement. As a condition to the consummation of
the Exchange, the Corporation and DMTR are executing and delivering the
Registration Rights Agreement in the form of Exhibit 1 hereto.

         3. Representations. The Corporation represents and warrants that the
execution, delivery and performance of this Agreement have been duly authorized
by all required corporate action of the Corporation and that the Shares are duly
authorized, fully paid and non-assessable shares of the Common Stock of the
Corporation.

         4. Miscellaneous Provisions. (a) Neither this Agreement nor any right
or obligation arising hereunder may be assigned by either party without prior
written consent of the other party, and any purported assignment without such
consent shall be null and void. (b) This Agreement shall be binding upon and
inure to the benefit solely of the parties hereto and their respective
successors and permitted assigns. (c) This Agreement, together with its exhibits
and schedules, if any, set forth the entire agreement between the parties hereto
with respect to the subject matter hereof and supersede and cancel any and all
prior or contemporaneous discussions, negotiations, arrangements and agreements
between them, express or implied, oral or written with respect to such subject
matter hereof. The parties acknowledge that no representations or promises have
been made to induce either of them to enter into this Agreement other than as
may be specifically set forth herein. (d) This Agreement may not be amended or
modified except by a writing signed by each of the parties hereto stating that
an amendment is intended. (e) The execution, interpretation and performance of
this Agreement shall be governed by the internal laws of the State of New York,
without regard to that State's conflict-of-laws principles. (f) This Agreement
may be

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signed in counterparts, each of which shall be deemed an original and all of
which shall be deemed one and the same instrument.

         IN WITNESS WHEREOF, the undersigned have executed and delivered this
Agreement as of the date first set forth above.

                                            DATAMETRICS CORPORATION

                                            By:__________________________
                                                 Name:  Vincent J. Cahill
                                                 Title:  President and CEO

                                            DMTR, LLC

                                            By:__________________________
                                                 Name: Bruce Galloway
                                                 Title:  Managing Member<PAGE>

                          REGISTRATION RIGHTS AGREEMENT

         REGISTRATION RIGHTS AGREEMENT dated as of the 31st day of January, 2001
(this "Agreement") by and between DATAMETRICS CORPORATION, a Delaware
corporation (the Corporation"), and DMTR, LLC, a New York limited liability
company (the "Investor").

         WHEREAS, the Investor owns or has the right to purchase or otherwise
acquire shares of the Common Stock (as hereinafter defined) of the Corporation;

         WHEREAS, the Corporation and the Investor deem it to be in their
respective best interest to set forth the rights of the Investor in connection
with the public offerings and sales of the Common Stock;

         NOW, THEREFORE, in consideration of the premises and mutual covenants
and obligations hereinafter set forth, the Corporation and the Investor hereby
agree as follows:

         SECTION 1.        DEFINITIONS.

         As used in this Agreement the following terms shall have the following
meanings:

         (a) "Commission" means the Securities and Exchange Commission or any
other Federal agency at the time administering the Securities Act.

         (b) "Common Stock" means, the common stock, $.01 par value per share,
of the Corporation.

         (c) "Exchange Act" means the Securities Exchange Act of 1934 or any
successor Federal statute, and the rules and regulations of the Commission
promulgated thereunder, all as the same shall be in effect from time to time.

         (d) "Investor" means the persons set forth on Schedule 1 to this
Agreement and each additional person who shall execute a counterpart signature
page hereto, and includes any successor to, or assignee or transferee of, any
such person who or which agrees in writing to be treated as an Investor
hereunder and to be bound by the terms and comply with all applicable provisions
hereof.

         (e) "Other Shares" means at any time those shares of Common Stock which
do not constitute Primary Shares or Registrable Shares.

         (f) "Primary Shares" means at any time the authorized but unissued
shares of Common Stock held by the Corporation in its treasury.

         (g) "Registrable Shares" means shares of Common Stock held by the
Investor issued pursuant to the Exchange Agreement dated as of January 31, 2001
between the Corporation and the Investor. As to any particular Registrable
Shares, once issued, such Registrable Shares shall cease to be Registrable
Shares when (i) they have been registered under the Securities Act, the
registration statement in connection therewith has been declared effective and
they have been

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disposed of pursuant to such effective registration statement, (ii) they are
eligible to be sold or distributed pursuant to Rule 144 within any consecutive
three month period (including, without limitation, Rule 144(k)) without volume
limitations, or (iii) they shall have ceased to be outstanding.

         (h) "Registration Date" means the date upon which the registration
statement pursuant to which the Corporation shall have initially registered
shares of Common Stock under the Securities Act for sale to the public shall
have been declared effective.

         (i) "Rule 144" means Rule 144 promulgated under the Securities Act or
any successor rule thereto or any complementary rule thereto (such as Rule
144A).

         (j) "Securities Act" means the Securities Act of 1933 or any successor
Federal statute, and the rules and regulations of the Commission thereunder, all
as the same shall be in effect from time to time.

         SECTION 2.        REQUIRED REGISTRATION.

         On any date after three (3) months following the Registration Date, if
holders representing not less than 50% of the Registrable Shares then
outstanding shall in writing state that such holders desire to sell Registrable
Shares in the public securities markets and request the Corporation to effect
the registration under the Securities Act of Registrable Shares, the Corporation
shall promptly use its best efforts to effect the registration under the
Securities Act of the Registrable Shares which the Corporation has been so
requested to register; provided, however, that the Corporation shall not be
obligated to effect any registration under the Securities Act except in
accordance with the following provisions:

         (a) the Corporation shall not be obligated to use its best efforts to
file and cause to become effective (i) more than one registration statement
initiated pursuant to this Section 2 in any six-month period, (ii) more than two
registration statements initiated pursuant to this Section 2 on Form S-1
promulgated under the Securities Act or any successor from thereto, (iii) any
registration on Form S-3 (or any comparable or successor form) until the
Corporation has qualified for use thereof, at which time there shall be no limit
on the number of registrations on Form S-3 that the holder may request or (iv)
any registration statements during any period in which any other registration
statement (other than on Form S-4 or Form S-8 promulgated under the Securities
Act or any successor forms thereto) pursuant to which Primary Shares are to be
or were sold has been filed and not withdrawn or has been declared effective
within the 90 days.

         (b) the Corporation may delay the filing or effectiveness of any
registration statement for a period of up to 90 days after the date of a request
for registration pursuant to this Section 2 if at the time of such request (i)
the Corporation is engaged, or has fixed plans to engage within 90 days of the
time of such request, in a firm commitment underwritten public offering of
Primary Shares in which the holders of Registrable Shares may include
Registrable Shares pursuant to Section 3 or (ii) the Corporation reasonably
determines that such registration and offering would interfere with any material
transaction involving the Corporation, as approved by the Board of Directors,
provided however, that the Corporation may only delay the filing or
effectiveness of a registration statement pursuant to this Section 2(b) for a
total of 120 days after the date of a request for registration pursuant to this
Section 2.

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         (c) with respect to any registration pursuant to this Section 2, the
Corporation shall give notice of such registration to any Investor who does not
request registration hereunder and to the holders of all Other Shares which are
entitled to registration rights and the Corporation may include in such
registration any Primary Shares or Other Shares; provided, however, that if the
managing underwriter advises the Corporation that the inclusion of all
Registrable Shares, Primary Shares and/or Other Shares proposed to be included
in such registration would interfere with the successful marketing (including
pricing) of the Registrable Shares proposed to be included in such registration,
then the number of Registrable Shares, Primary Shares and/or Other Shares
proposed to be included in such registration shall be included in the following
order:

                  (i) first, the Registrable Shares requested to be included in
such registration (or, if necessary, such Registrable Shares pro rata among the
holders thereof based upon the number of Registrable Shares requested to be
registered by each such holder);

                  (ii) second, the Primary Shares; and

                  (iii) third, the Other Shares which are entitled to
registration rights.

         (d) At any time before the registration statement covering Registrable
Shares become effective, the holders of a majority of such shares may request
the Corporation to withdraw or not to file the registration statement. In that
event, if such request of withdrawal shall not have been caused by, or made in
response to, the material adverse effect of an event on the business,
properties, conditions, financial or otherwise, or operations of the
Corporation, the holders shall have used their demand registration right under
this Section 2 and the Corporation shall no longer be obligated to register
Registrable Shares pursuant to the exercise of such registration right pursuant
to this Section 2 unless the remaining holders shall pay to the Corporation the
expenses incurred by the Corporation through the date of such request.

         SECTION 3.        PIGGYBACK REGISTRATION.

         If the Corporation at any time proposes for any reason to register
Primary Shares or Other Shares under the Securities Act (other than on Form S-4
or Form S-8 promulgated under the Securities Act or any successor forms
thereto), it shall give written notice to the Investors of its intention so to
register such Primary Shares or Other Shares at least 30 days before the initial
filing of such registration statement and, upon the written request, delivered
to the Corporation within 20 days after delivery of any such notice by the
Corporation, of the Investors to include in such registration Registrable Shares
(which request shall specify the number of Registrable Shares proposed to be
included in such registration and shall state that such Investors desire to sell
such Registrable Shares in the public securities markets), the Corporation shall
use its best efforts to cause all such Registrable Shares to be included in such
registration on the same terms and conditions as the securities otherwise being
sold in such registration; provided, however, that if the managing underwriter
advises the Corporation that the inclusion of all Registrable Shares requested
to be included in such registration would interfere with the successful
marketing (including pricing) of the Primary Shares or Other Shares proposed to
be registered by the Corporation, then the number of Primary Shares, Registrable
Shares and Other Shares proposed to be included in such registration shall be
included in the following order:

         (a) if the Corporation proposes to register Primary Shares, or Primary
Shares and Other Shares:

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                  (i) First, the Primary Shares; and

                  (ii) Second, the Registrable Shares and Other Shares requested
to be included in such registration (or, if necessary, such Registrable Shares
and Other Shares pro rata among the holders thereof based upon the number of
shares of Registrable Shares and Other Shares requested to be registered by each
such holder); or

         (b) if the Corporation proposes to register Other Shares pursuant to a
request for registration by the holders of such Other Shares (other than
pursuant to Section 3 hereof):

                  (i) First, the Other Shares held by the parties demanding such
registration; and

                  (ii) Second, the Registrable Shares and Other Shares (other
than shares registered pursuant to Section 3(b)(1) hereof) requested to be
registered by the holders hereof (or, if necessary, pro rata among the holders
thereof based on the number of Registrable Shares and Other Shares requested to
be registered by such holders).

         SECTION 4.        HOLDBACK AGREEMENT.

         If the Corporation at any time shall register shares of Common Stock
under the Securities Act (including any registration pursuant to Sections 2 and
3 hereof) for sale to the public, the Investor shall not sell publicly, make any
short sale of, grant any option for the purchase of, or otherwise dispose
publicly of, any Registrable Shares (other than those shares of Common Stock
included in such registration pursuant to Sections 2 and 3 hereof) without the
prior written consent of the Corporation, for a period designated by the
Corporation in writing to the Investor which period shall begin not more than 10
days prior to the effectiveness of the registration statement pursuant to which
such public offering shall be made and shall not last more than 180 days after
the effective date of such registration statement. The Corporation shall obtain
the agreement of any person permitted to sell shares of stock in a registration
to be bound by and to comply with this Section 4 as if such person was an
Investor hereunder.

         SECTION 5.        PREPARATION AND FILING.

         If and whenever the Corporation is under an obligation pursuant to the
provisions of this Agreement to use its best efforts to effect the registration
of any Registrable Shares, the Corporation shall as expeditiously as
practicable:

         (a) use its best efforts to cause a registration statement that
registers such Registrable Shares to become and remain effective for a period of
90 days or until all of such Registrable Shares have been disposed of (if
earlier);

         (b) furnish, at least five business days before filing a registration
statement that registers such Registrable Shares, a prospectus relating thereto
or any amendments or supplements relating to such a registration statement or
prospectus, to one counsel selected by the Investors (the "Investors' Counsel"),
copies of all such documents proposed to be filed (it being understood that such
five-business-day period need not apply to successive drafts of the same
document proposed to be filed so long as such successive drafts are supplied to
the

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Investors' Counsel in advance of the proposed filing by a period of time that
is customary and reasonable under the circumstances);

         (c) prepare and file with the Commission such amendments and
supplements to such registration statement and the prospectus used in connection
therewith as may be necessary to keep such registration statement effective for
at least a period of 90 days or until all of such Registrable Shares have been
disposed of (if earlier) and to comply with the provisions of the Securities Act
with respect to the sale or other disposition of such Registrable Shares;

         (d) notify in writing the Investor's Counsel promptly (i) of the
receipt by the Corporation of any notification with respect to any comments by
the Commission with respect to such registration statement or prospectus or any
amendment or supplement thereto or any request by the Commission for the
amending or supplementing thereof or for additional information with respect
thereto, (ii) of the receipt by the Corporation of any notification with respect
to the issuance by the Commission of any stop order suspending the effectiveness
of such registration statement or prospectus or any amendment or supplement
thereto or the initiation or threatening of any proceeding for that purpose and
(iii) of the receipt by the Corporation of any notification with respect to the
suspension of the qualification of such Registrable Shares for sale in any
jurisdiction or the initiation or threatening of any proceeding for such
purposes;

         (e) use its best efforts to register or qualify such Registrable Shares
under such other securities or blue sky laws of such jurisdictions as the
Investors reasonably request and do any and all other acts and things which may
be reasonably necessary or advisable to enable the Investors to consummate the
disposition in such jurisdictions of the Registrable Shares owned by the
Investors; provided, however, that the Corporation will not be required to
qualify generally to do business, subject itself to general taxation or consent
to general service of process in any jurisdiction where it would not otherwise
be required to do so but for this paragraph (e) or to provide any material
undertaking or make any changes in its By-laws or Certificate of Incorporation
which the Board of Directors determines to be contrary to the best interests of
the Corporation or to modify any of its contractual relationships then existing;

         (f) furnish to the Investor holding such Registrable Shares such number
of copies of a summary prospectus, if any, or other prospectus, including a
preliminary prospectus, in conformity with the requirements of the Securities
Act, and such other documents as such Investors may reasonably request in order
to facilitate the public sale or other disposition of such Registrable Shares;

         (g) without limiting subsection (e) above, use its best efforts to
cause such Registrable Shares to be registered with or approved by such other
governmental agencies or authorities as may be necessary by virtue of the
business and operations of the Corporation to enable the Investors holding such
Registrable Shares to consummate the disposition of such Registrable Shares;

         (h) notify the Investor holding such Registrable Shares on a timely
basis at any time when a prospectus relating to such Registrable Shares is
required to be delivered under the Securities Act within the appropriate period
mentioned in subparagraph (a) of this Section 4, of the happening of any event
as a result of which the prospectus included in such registration statement, as
then in effect, 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 not misleading in light of the circumstances then existing
and, at the request of the Investor, prepare

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and furnish to such Investor a reasonable number of copies of a supplement to or
an amendment of such prospectus as may be necessary so that, as thereafter
delivered to the offerees of such shares, such prospectus shall not include an
untrue statement of a material fact or omit to state a material fact required to
be stated therein or necessary to make the statements therein not misleading in
light of the circumstances then existing;

         (i) subject to the execution of confidentiality agreements in form and
substance satisfactory to the Corporation, make available upon reasonable notice
and during normal business hours, for inspection by the Investor holding such
Registrable Shares, any underwriter participating in any disposition pursuant to
such registration statement and any attorney, accountant or other agent retained
by the Investor or underwriter (collectively, the "Inspectors"), all pertinent
financial and other records, pertinent corporate documents and properties of the
Corporation (collectively, the "Records"), as shall be reasonably necessary to
enable them to exercise their due diligence responsibility, and cause the
Corporation's officers, directors and employees to supply all information
(together with the Records, the "Information") reasonably requested by any such
Inspector in connection with such registration statement. Any of the Information
which the Corporation determines in good faith to be confidential and of which
determination the Inspectors are so notified, shall not be disclosed by the
Inspectors unless (i) the disclosure of such Information is necessary to avoid
or correct a misstatement or an omission in the registration statement, (ii) the
release of such Information is ordered pursuant to a subpoena or other order
from a court of competent jurisdiction or (iii) such Information has been made
generally available to the public; the Investors agree that they will, upon
learning that disclosure of such information is sought in a court of competent
jurisdiction, give notice to the Corporation and allow the Corporation, at the
Corporation's expense, to undertake appropriate action to prevent disclosure of
the Information deemed confidential;

         (j) use its best efforts to obtain from its independent certified
public accountants "cold comfort" letters addressed to the Corporation and any
selling Stockholders in customary form and at customary times and covering
matters of the type customarily covered by cold comfort benefits;

         (k) use its best efforts to obtain from its counsel an opinion or
opinions in customary form addressed to the Corporation and any selling
Stockholders;

         (l) provide a transfer agent and registrar (which may be the same
entity and which may be the Corporation) for such Registrable Shares;

         (m) issue to any underwriter to which the Investor holding such
Registrable Shares may sell shares in such offering certificates evidencing such
Registrable Shares;

         (n) list such Registrable Shares on any national securities exchange on
which any shares of the Common Stock are listed or, if the Common Stock is not
listed on a national securities exchange, use its best efforts to qualify such
Registrable Shares for inclusion on the automated quotation system of the
National Association of Securities Dealers, Inc. (the "NASD"), or such other
national securities exchange as the holders of a majority of such Registrable
Shares shall reasonably request;

         (o) otherwise use its best efforts to comply with all applicable rules
and regulations of the Commission and make available to its security holders, as
soon as reasonably practicable, earnings statements (which need not be audited)
covering a period of 12 months beginning

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within three months after the effective date of the registration statement,
which earnings statements shall satisfy the provisions of Section 11 (a) of the
Securities Act; and

         (p) subject to all the other provisions of this Agreement, use its best
efforts to take all other steps accessory to effect the registration of such
Registrable Shares contemplated hereby.

         Each holder of the Registrable Shares, upon receipt of any notice from
the Corporation of any event of the kind described in Section 4(h) hereof, shall
forthwith discontinue disposition of the Registrable Shares pursuant to the
registration statement covering such Registrable Shares until such holders'
receipt of the copies of the supplemented or amended prospectus contemplated by
Section 4(h) hereof, and, if so directed by the Corporation, such holder shall
deliver to the Corporation all copies, other than permanent file copies then in
such holder's possession, of the prospectus covering such Registrable Shares at
the time of receipt of such notice.

         SECTION 6.        EXPENSES

         All expenses (other than underwriting discounts and commissions
relating to the Registrable Shares, as provided in the last sentence of this
Section 6) incurred by the Corporation in complying with Section 5, including,
without limitation, all registration and filing fees (including all expenses
incident to filing with the NASD), fees and expenses of complying with
securities and blue sky laws, printing expenses, fees and expenses of the
Corporation's counsel and accountants, and reasonable fees and expenses of the
Investors' Counsel, shall be paid by the Corporation; provided, however, that
all underwriting discounts and selling commissions applicable to the Registrable
Shares and Other Shares shall be borne by the holders selling such Registrable
Shares and Other Shares, in proportion to the number of Registrable Shares and
Other Shares sold by each such holder.

         SECTION 7.        INDEMNIFICATION.

         (a) In connection with any registration of any Registrable Shares under
the Securities Act pursuant to this Agreement, the Corporation shall indemnify
and hold harmless the holders of Registrable Shares, each underwriter, broker or
any other person acting on behalf of the holders of Registrable Shares and each
other person, if any, who controls any of the foregoing persons within the
meaning of the Securities Act against any losses, claims, damages or
liabilities, joint or several (or actions in respect thereof), to which any of
the foregoing persons may become subject under the Securities Act or otherwise,
insofar as such losses, claims, damages or liabilities (or actions in respect
thereof) arise out of or are based upon an untrue statement or allegedly untrue
statement of a material fact contained in the registration statement under which
such Registrable Shares were registered under the Securities Act, any
preliminary prospectus or final prospectus contained therein or otherwise filed
with the Commission, any amendment or supplement thereto or any document
incident to registration or qualification of any Registrable Shares, or arise
out of or are based upon the omission or alleged omission to state therein a
material fact required to be stated therein or necessary to make the statements
therein not misleading or, with respect to any prospectus, necessary to make the
statements therein in light of the circumstances under which they were made not
misleading, or any violation by the Corporation of the Securities Act or state
securities or blue sky laws applicable to the Corporation and relating to action
or inaction required of the Corporation in connection with such registration or
qualification under such state securities or blue sky laws; and shall reimburse
the holders of Registrable Shares, such underwriter, such broker or such other
person

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acting on behalf of the holders of Registrable Shares and each such controlling
person for any legal or other expenses reasonably incurred by any of them in
connection with investigating or defending any such loss, claim, damage,
liability or action; provided, however, that the Corporation shall not be liable
in any such case to the extent that any such loss, claim, damage, liability or
action (including any legal or other expenses incurred) arises out of or is
based upon an untrue statement or allegedly untrue statement or omission or
alleged omission made in said registration statement, preliminary prospectus,
final prospectus, amendment supplement or document incident to registration or
qualification of any Registrable Shares in reliance upon and in conformity with
written information furnished to the Corporation through an instrument duly
executed by the holders of Registrable Shares or their counsel or underwriter
specifically for use in the preparation thereof; provided further, however, that
the foregoing indemnity agreement is subject to the condition that, insofar as
it relates to any untrue statement, omission or alleged omission made in any
preliminary prospectus but eliminated or remedied in the final prospectus (filed
pursuant to Rule 424 of the Securities Act), such indemnity agreement shall not
inure to the benefit of any Investor, underwriter, broker or other person acting
on behalf of holders of the Restricted Shares from whom the person asserting any
loss, claim, damage, liability or expense purchased the Restricted Shares which
are the subject thereof, if a copy of such final prospectus had been made
available to such person and such Investor, underwriter, broker or other person
acting on behalf of holders of the Registrable Shares and such final prospectus
was not delivered to such person with or prior to the written confirmation of
the sale of such Registrable Shares to such person.

         (b) In connection with any registration of Registrable Shares under the
Securities Act pursuant to this Agreement, each holder of Registrable Shares
shall severally and not jointly indemnify and hold harmless (in the same manner
and to the same extent as set forth in the preceding paragraph of this Section
7) the Corporation, each director of the Corporation, each officer of the
Corporation who shall sign such registration statement, each underwriter, broker
or other person acting on behalf of the holders of Registrable Shares and each
person who controls any of the foregoing persons within the meaning of the
Securities Act with respect to any statement or omission from such registration
statement, any preliminary prospectus or final prospectus contained therein or
otherwise filed with the Commission, any amendment or supplement thereto or any
document incident to registration or qualification of any Registrable Shares, if
such statement or omission was made in reliance upon and in conformity with
written information furnished to the Corporation or such underwriter
specifically for use in connection with the preparation of such registration
statement, preliminary prospectus, final prospectus, amendment, supplement or
document; provided, however, that the maximum amount of liability in respect of
such indemnification shall be limited, in the case of each Seller of Registrable
Shares, to an amount equal to the net proceeds actually received by such Seller
from the sale of Registrable Shares effected pursuant to such registration.

         (c) Promptly after receipt by an indemnified party of notice of the
commencement of any action involving a claim referred to in the preceding
paragraphs of this Section 7, such indemnified party will, if a claim in respect
thereof is made against an indemnifying party, give written notice to the latter
of the commencement of such action. The failure of any indemnified party to
notify an indemnifying party of any such action shall not (unless such failure
shall have a material adverse effect on the indemnifying party) relieve the
indemnified party on account of this Section 7. In case any such action is
brought against an indemnified party, the indemnifying party will be entitled to
participate in and to assume the defense thereof, jointly with any other
indemnifying party similarly notified to the extent that it may wish, with
counsel reasonably satisfactory to such indemnified party, and after notice from
the indemnifying party to such

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indemnified party of its election so to assume the defense thereof, the
indemnifying party shall not be responsible for any legal or other expenses
subsequently incurred by the indemnified party in connection with the defense
thereof; provided, however, that if any indemnified party shall have reasonably
concluded that there may be one or more legal or equitable defenses available to
such indemnified party which are additional to or conflict with those available
to the indemnifying party, or that such claim or litigation involves or could
have an effect upon matters beyond the scope of the indemnity agreement provided
in this Section 7, the indemnifying party shall not have the right to assume the
defense of such action on behalf of such indemnified party (but shall have the
right to participate therein with counsel of its choice) and such indemnifying
party shall reimburse such indemnified party and any person controlling such
indemnified party for that portion of the fees and expenses of any counsel
retained by the indemnified party which is reasonably related to the matters
covered by the indemnity agreement provided in this Section 7. If the
indemnifying party is not entitled to, or elects not to, assume the defense of a
claim, it will not be obligated to pay the fees and expenses of more than one
counsel with respect to such claim.

         (d) If the indemnification provided for in this Section 7 is held by a
court of competent jurisdiction to be unavailable to an indemnified party with
respect to any loss, claim, damage, liability or action referred to herein, then
the indemnifying party, in lieu of indemnifying such indemnified party
hereunder, shall contribute to the amounts paid or payable by such indemnified
party as a result of such loss, claim, damage, liability or action in such
proportion as is appropriate to reflect the relative fault of the indemnifying
party on the one hand and of the indemnified party on the other in connection
with the statements or omissions which resulted in such loss, claim, damage,
liability or action as well as any other relevant equitable considerations. The
relative fault of the indemnifying party and of the indemnified party shall be
determined by reference to, among other things, whether the untrue or alleged
untrue statement of a material fact or the omission or alleged omission to state
a material fact relates to information supplied by the indemnifying party or by
the indemnified party and the parties' relative intent, knowledge, access to
information and opportunity to correct or prevent such statement or omission.
The parties agree that it would not be just and equitable if contribution
pursuant hereto were determined by pro rata allocation or by any other method or
allocation which does not take account of the equitable considerations referred
to herein. No person guilty of fraudulent misrepresentation shall be entitled to
contribution from any person.

         SECTION 8.        UNDERWRITING AGREEMENT.

         Notwithstanding the provisions of Sections 3, 4, 5 and 6, to the extent
that the Investor shall enter into an underwriting or similar agreement, which
agreement contains provisions covering one or more issues addressed in such
Sections, the provisions contained in such agreement addressing such issue or
issues shall control; provided, however, that any such agreement to which the
Corporation is not a party shall not be binding upon the Corporation. No bolder
may participate in any underwritten registration hereunder unless such holder
(a) agrees to such holder's securities on the basis provided in any underwriting
arrangements and (b) completes and executes all questionnaires, powers of
attorney, indemnities, underwriting agreements and other documents reasonably
and customarily required under the terms of such underwriting arrangements.

         SECTION 9.        INFORMATION BY HOLDER.

                                       9
<PAGE>

         The Investor shall furnish to the Corporation such written information
regarding the Investor and the distribution proposed by the Investor as the
Corporation may reasonably request in writing and as shall be reasonably
required in connection with any registration, qualification or compliance
referred to in this Agreement.

         SECTION 10.       EXCHANGE ACT COMPLIANCE.

         From the Registration Date or such earlier date as a registration
statement filed by the Corporation pursuant to the Exchange Act relating to any
class of the Corporation's securities shall have become effective, the
Corporation shall comply with all of the reporting requirements of the Exchange
Act applicable to it (whether or not it shall be required to do so, but
specifically excluding Section 14 of the Exchange Act if not then applicable to
the Corporation) and shall comply with all other public information reporting
requirements of the Commission which are conditions to the availability of Rule
144 for the sale of the Common Stock. The Corporation shall cooperate with the
Investors in supplying such information as may be necessary for the Investors to
complete and file any information reporting forms presently or hereafter
required by the Commission as a condition to the availability of Rule 144.

         SECTION 11.       NO CONFLICT OF RIGHTS

         The Corporation shall not, after the date hereof, grant any
registration rights which conflict with or impair the registration rights
granted hereby. In the event the Corporation grants to any person any
registration rights that are superior in scope or substance to the registration
rights granted to the holders of the Registrable Shares, such superior rights
shall be simultaneously granted to such holders.

         SECTION 12.       TERMINATION.

         This Agreement shall terminate and be of no further force or effect
when there shall no longer be any Registrable Shares outstanding; provided that
Sections 6 and 7 shall survive any termination of this Agreement.

         SECTION 13.       SUCCESSORS AND ASSIGNS.

         This Agreement shall bind and inure to the benefit of the Corporation
and the Investors and, subject to Section 14, the respective successors and
assigns of the Corporation and the Investors.

         SECTION 14.       ASSIGNMENT.

         The Investor may assign its rights hereunder to any purchaser or
transferee of Registrable Shares; provided, however, that such purchaser or
transferee shall, as a condition to the effectiveness of such assignment, be
required to execute a counterpart to this Agreement agreeing to be treated as an
Investor whereupon such purchaser or transferee shall have the benefits of, and
shall be subject to the restrictions contained in, this Agreement as if such
purchaser or transferee was originally included in the definition of an Investor
herein and had originally been a party hereto

         SECTION 15.       ENTIRE AGREEMENT

                                       10
<PAGE>

         This Agreement and the other writings referred to herein or therein or
delivered pursuant hereto or thereto, contain the entire agreement between the
Investor and the Corporation with respect to the subject matter hereof and
supersede all prior and contemporaneous arrangements or understandings with
respect thereto.

         SECTION 16.       NOTICES.

         All notices, requests, consents and other communications hereunder to
any party shall be deemed to be sufficient if contained in a written instrument
delivered in person or sent by telecopy, nationally-recognized overnight courier
or first class registered or certified mail return receipt requested, postage
prepaid, addressed to such party at the address set forth below or such other
address as may hereafter be designated in writing by such party to the other
parties:

                 (i)      if to the Investor, to:

                                    DMTR, LLC
                                    1325 Avenue of the Americas, 26th Floor
                                    New York, New York 10019
                                    Telephone:  (212) 603-7590
                                    Fax:   (212) 603-7502
                                    Attention:   President

                           with a copy to:

                                    Piliero Goldstein Jenkins & Sullivan, LLP
                                    292 Madison Avenue
                                    New York, New York 10017
                                    Telephone:  212-213-8200
                                    Fax:            212-685-2028
                                    Attention:   Jay Jenkins; and

                  (ii)     if to the Corporation, to:

                                    Datametrics Corporation
                                    1717 Diplomacy Row
                                    Orlando, Florida 32809
                                    Telephone: 407-251-4577
                                    Fax:  407-251-4588
                                    Attention:   President

All such notices, requests, consents and other communications shall be deemed to
have been delivered (a) in the case of personal delivery or delivery by
telecopy, on the date of such delivery, (b) in the case of dispatch by
nationally-recognized overnight courier, on the next business day following such
dispatch and (c) in the case of mailing, on the third business day after the
posting thereof.

         SECTION 17.       MODIFICATIONS; AMENDMENTS; WAIVERS.

         The terms and provisions of this Agreement may not be modified or
amended, nor may any provision be waived, except pursuant to a writing signed by
the Corporation and the holders

                                       11
<PAGE>

of at least a majority of the Registrable Shares then outstanding, provided that
in no event may any such modification, amendment or waiver alter any rights of
the holders of the shares of the Preferred Stock without the consent of such
holders.

         SECTION 18.       COUNTERPARTS.

         This Agreement may be executed in any number of counterparts, and each
such counterpart hereof shall be deemed to be an original instrument, but all
such counterparts together shall constitute but one agreement.

                                       12
<PAGE>

         SECTION 19.       HEADINGS.

         The headings of the various sections of this Agreement have been
inserted for convenience of reference only and shall not be deemed to be a part
of this Agreement.

         SECTION 20.       GOVERNING LAW.

         This Agreement shall be governed by and construed in accordance with
the laws of the State of New York applicable to contracts made and to be
performed wholly therein.

         IN WITNESS WHEREOF, the undersigned have executed and delivered this
Agreement as of the date first set forth above.

                                              DATAMETRICS CORPORATION

                                              By:_________________________
                                                    Name: Vincent J. Cahill
                                                    Title: President and CEO

                                              DMTR, LLC

                                              By:______________________________
                                                    Name:  Bruce Galloway
                                                    Title:  Managing Member

                                       13

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