Document:

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                                                                    EXHIBIT 10.9

                      SENIOR SUBORDINATED CONVERTIBLE NOTE

$ 588,000.00                                                  SEPTEMBER 30, 2003

FOR VALUE RECEIVED, the undersigned, Eagle Test Systems, Inc., an Illinois
corporation (the "BORROWER"), HEREBY PROMISES TO PAY to the order of TA
Investors, LLC (the "NOTEHOLDER") the principal sum of $ 588,000.00, together
with interest on the unpaid principal amount from time to time outstanding at
the rate or rates and computed and payable at the times as described in the Note
Purchase Agreement (as hereinafter defined). Payments of the principal hereof
shall be made as provided in the Note Purchase Agreement. Notwithstanding any
other provision of this note, the entire balance of principal and accrued and
unpaid interest shall be paid in full on September 30, 2009.

      This note is one of the Convertible Notes referred to in the Note Purchase
Agreement dated as of September 30, 2003 (as the same may be amended, modified
or supplemented from time to time, the "NOTE PURCHASE AGREEMENT") among the
Borrower, the Noteholder and certain other Noteholders named therein.
Capitalized terms used herein and not otherwise defined shall have the meanings
set forth in the Note Purchase Agreement.

      The Noteholder may convert this note at any time pursuant to the terms of
the Note Purchase Agreement into (a) a Senior Subordinated Note due September
30, 2009 in the principal amount of $ 587,902.00 plus any interest owed in
arrears on this note on the Conversion Date, in the form attached hereto as
Exhibit A, and (b) a Common Stock Purchase Warrant of the Borrower for the
purchase of 4.116 shares of the Borrower's Common Stock (subject to adjustment
as provided for therein), exercisable at a price per share of $.01 (subject to
adjustment as provided for therein) in the form attached hereto as Exhibit B,
all as further described in the Note Purchase Agreement.

      Subject to, and at all times in accordance with, the provisions of the
Note Purchase Agreement (i) the Borrower shall have the right, at any time, to
voluntarily prepay all or any part of the outstanding principal amount of this
note, and (ii) the Noteholder shall have the right to require the Borrower to
repurchase this note upon the occurrence of a Mandatory Repurchase Event.

      In addition to the payment of interest as provided above, the Borrower
shall, on demand, pay interest on any overdue installments of principal and, to
the extent permitted by applicable law, on overdue installments of interest at
the rate set forth in, and in accordance with the provisions of, the Note
Purchase Agreement.

      The holder of this note is entitled to all the benefits and rights of a
Noteholder under the Note Purchase Agreement to which reference is hereby made
for a statement of the terms and conditions under which the entire unpaid
balance of this note, or any portion thereof, shall become immediately due and
payable. Notwithstanding anything in this note to the contrary, the terms and
provisions of this note shall at all times be governed by and subject to all of
the terms

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and provisions of the Note Purchase Agreement. To the extent that there is any
conflict with, or inconsistency between, the terms and provisions of this note
and the terms and provisions of the Note Purchase Agreement, the terms and
provisions of the Note Purchase Agreement shall at all times govern and control.

      The Borrower hereby waives presentment, demand, notice, protest and other
demands and notices in connection with the delivery, acceptance or enforcement
of this note.

      No delay or omission on the part of the holder of this note in exercising
any right hereunder shall operate as a waiver of such right or of any other
right under this note, and a waiver, delay or omission on any one occasion shall
not be construed as a bar to or waiver of any such right on any future occasion.

      The terms and provisions of this note are subject to the dispute
resolution provisions contained in Sections 9.11 and 9.12 of the Note Purchase
Agreement.

      This note shall be deemed to be under seal, and all rights and obligations
hereunder shall be governed by the laws of the State of New York (without giving
effect to any conflicts of law provisions contained therein).

                                        EAGLE TEST SYSTEMS, INC.

                                        By: Leonard Foxman
                                            ---------------------------------
                                            Name:  Leonard Foxman
                                            Title: President<PAGE>

                                                                   EXHIBIT 10.10

Warrant No. ___                                        _______________ ___, 200_

                                     FORM OF
                        WARRANT TO PURCHASE COMMON STOCK
                                       OF
                            EAGLE TEST SYSTEMS, INC.

THIS WARRANT AND THE UNDERLYING SECURITIES ISSUABLE UPON EXERCISE OF THIS
WARRANT HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED
(THE "SECURITIES ACT"), OR ANY STATE SECURITIES LAWS AND MAY NOT BE OFFERED,
SOLD, TRANSFERRED, HYPOTHECATED OR OTHERWISE ASSIGNED EXCEPT (1) PURSUANT TO A
REGISTRATION STATEMENT WITH RESPECT TO SUCH SECURITIES THAT IS EFFECTIVE UNDER
THE SECURITIES ACT OR PURSUANT TO AN AVAILABLE EXEMPTION FROM REGISTRATION UNDER
THE SECURITIES ACT RELATING TO THE DISPOSITION OF SECURITIES AND (2) IN
ACCORDANCE WITH APPLICABLE STATE SECURITIES LAWS.

      Eagle Test Systems, Inc., an Illinois corporation (together with its
successors, the "COMPANY"), hereby certifies that, for value received,
__________ (together with its successors and assigns and any transferee of this
Warrant, and its successors and assigns, the "HOLDER"), is entitled, subject to
the terms and conditions set forth in this warrant (this "WARRANT"), to purchase
from the Company, at any time or times on or after the date hereof, but not
after 5:00 P.M., Boston, Massachusetts time on September 30, 2013 (the
"EXPIRATION DATE"), _______________ duly authorized, validly issued, fully paid,
nonassessable shares of Common Stock (as defined below) (as further defined
below, the "WARRANT SHARES"), which shall be adjusted or readjusted from time to
time as provided in this Warrant, at an initial purchase price per share equal
to $0.01 (the "INITIAL WARRANT PRICE"), which shall be adjusted or readjusted
from time to time in connection with any stock splits, stock dividends,
recaptializations or like transactions affecting the Common Stock (as adjusted,
the "WARRANT PRICE"); provided; however, that notwithstanding the foregoing, in
no event shall the Warrant Price be reduced to a number that is less than the
par value of the Common Stock at the date of exercise of this Warrant.

      This Warrant is a Common Stock purchase warrant (each, a "WARRANT," and
collectively, the "WARRANTS," with such term to include any warrants issued in
substitution therefor) issued in connection with the conversion of the Senior
Subordinated Secured Convertible Notes due September 30, 2009 issued by the
Company (the "CONVERTIBLE NOTES") pursuant to that certain Note Purchase
Agreement dated as of September 30, 2003 (the "CLOSING DATE") (as it may be
amended from time to time, the "PURCHASE AGREEMENT") among the Company and the
Noteholders named therein. The Warrants represent a right to purchase an
aggregate of 210.016 shares of the Company's common stock, no par value (the
"COMMON STOCK"), subject to adjustment as provided herein. For purposes of this
Warrant Certificate, "Holders" shall mean the holders of the Warrants and
"Warrant Shares" shall mean shares of the Company's Common Stock; provided,
however, that if, in accordance with Section 2 hereof, the securities issuable

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upon exercise of the Warrants are issued by an entity other than the Company or
there is a change in the class of securities so issuable, then the "Warrant
Shares" shall mean the securities so issuable by such entity or the securities
of the class of securities so issuable.

      All capitalized terms used herein that are not otherwise defined shall
have the meanings set forth in the Purchase Agreement.

SECTION 1. EXERCISE; EXCHANGE OF WARRANT

      1.1.  MANNER OF EXERCISE; EXCHANGE.

            (a)   Exercise. The Holder may exercise this Warrant, in whole or in
part (except as to a fractional share), at any time and from time to time during
normal business hours on any Business Day on or prior to the Expiration Date, by
(i) delivering to the Company a written notice, in the form attached hereto as
Exhibit A (the "EXERCISE NOTICE"), duly executed by the Holder, specifying the
number of Warrant Shares (without giving effect to any adjustment thereto) to be
issued to the Holder as a result of such exercise, (ii) surrendering this
Warrant to the Company, properly endorsed by the Holder (or if this Warrant has
been destroyed, stolen or has otherwise been misplaced, by delivering to the
Company an affidavit of loss duly executed by the Holder), and (iii) by
tendering payment for the shares of Common Stock designated by the Exercise
Notice in lawful money of the United States in the form of cash, bank or
certified check made payable to the order of the Company, or by wire transfer of
immediately available funds, or [by the cancellation of indebtedness] of the
Company owed to the Holder, including by surrender of any of the Company's
Senior Subordinated Secured Notes due September 30, 2009 (the "NOTES"), or in
any combination thereof, of an amount equal to the product of (A) the Warrant
Price and (B) the number of Warrant Shares (without giving effect to any
adjustment thereof) as to which this Warrant is being exercised.

            (b)   Net Exchange. The Holder may, in lieu of exercising or
converting this Warrant pursuant to the terms of Section 1.1(a), elect to
exchange this Warrant, in whole or in part (except as to a fractional share), at
any time and from time to time during normal business hours on any Business Day
on or prior to the Expiration Date by (i) delivering to the Company a written
notice, in the form attached hereto as Exhibit B (the "EXCHANGE NOTICE"), duly
executed by the Holder, specifying the number of Warrant Shares (without giving
effect to any adjustment thereto) to be issued to the Holder as a result of such
exchange, and (ii) surrendering this Warrant to the Company, properly endorsed
by the Holder (or if this Warrant has been destroyed, stolen or has otherwise
been misplaced, by delivering to the Company an affidavit of loss duly executed
by the Holder), and the Holder shall thereupon be entitled to receive the number
of Warrant Shares equal to the product of (A) the number of Warrant Shares
issuable upon exercise of this Warrant (or, if only a portion of this Warrant is
being exercised, issuable upon the exercise of such portion) for cash,
determined as provided in Section 2, and (B) a fraction, the numerator of which
is the Fair Market Value per share of Common Stock at the time of such exercise
minus the Warrant Price in effect at the time of such exercise, and the
denominator of which is the Fair Market Value per share of Common Stock at the
time of such exercise, such number of shares so issuable upon such exchange to
be rounded up or down to the nearest whole number of shares of Common Stock.

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            (c)   The "exchange" of this Warrant pursuant to Section 1.1(b) is
intended to qualify as a recapitalization within the meaning of Section
368(a)(1)(E) of the Code.

            (d)   For all purposes of this Warrant (other than this Section
1.1), any reference herein to the "exercise" of this Warrant shall be deemed to
include a reference to the exchange of this Warrant into Common Stock in
accordance with the terms of Section 1.1(b), and any reference to an "EXERCISE
NOTICE" shall be deemed to include a reference to an Exchange Notice in
accordance with the terms of Section 1.1(b).

      1.2.  WHEN EXERCISE EFFECTIVE. Each exercise of this Warrant shall be
deemed to have been effected immediately prior to the close of business on the
Business Day on which this Warrant shall be deemed to have been surrendered to
the Company as provided in Section 1.1, and at such time the Person or Persons
in whose name or names any certificate or certificates for shares of Common
Stock shall be issuable upon such exercise as provided in Section 1.3 shall be
deemed to have become the Holder or Holders of record thereof.

      1.3.  DELIVERY OF STOCK CERTIFICATES UPON EXERCISE. As soon as practicable
after exercise of this Warrant in accordance with this Section 1, but in no
event later than five (5) Business Days after such exercise, the Company shall
at its expense cause to be issued in the name of and delivered to the Holder or,
subject to Section 5 of this Warrant, as the Holder may direct: (a) a
certificate or certificates for the number of Warrant Shares, determined as
provided in Section 2 of this Warrant, to which the Holder shall be entitled
upon such exercise and, (b) unless this Warrant has expired or has been
exercised in full, a new Warrant (or Warrants) substantially in the form of, and
on the terms in, this Warrant, for the number of Warrant Shares remaining
following such exercise (without giving effect to any adjustment thereto), and
shall be subject to adjustment as provided for in this Warrant as of the date
hereof. Exercise of the Warrant shall be subject to compliance, if necessary,
with applicable provisions of the Hart-Scott-Rodino Antitrust Improvements Act
of 1976, as amended, and the Company shall make and cooperate with the Holder in
making any filings required thereunder.

SECTION 2. ADJUSTMENTS TO NUMBER AND TYPE OF WARRANT SHARES

      2.1.  GENERAL. The number of Warrant Shares that the Holder shall be
entitled to receive upon exercise of this Warrant shall be determined by
multiplying the number of Warrant Shares that would otherwise (but for the
provisions of this Section 2) be issuable upon such exercise, as designated by
the Holder in the Exercise Notice, by a fraction, (i) the numerator of which
shall be $18,916.802 (the "TARGET PRICE"), and (ii) the denominator of which
shall be the "Antidilution Price" in effect for this Warrant on the date of such
exercise. The initial Antidilution Price for this Warrant shall be the Target
Price, which Antidilution Price shall be subject to adjustment as provided in
this Section 2. If any of the events as described in this Section 2 shall occur
after the Closing Date, but prior to the issuance of this Warrant upon
conversion of the Convertible Notes, the number of Warrant Shares or other
securities purchasable upon exercise of the Warrant shall be adjusted to the
same extent as if this Warrant was outstanding as of the Closing Date.

      2.2.  ADJUSTMENTS.

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            (a)   Subdivision or Combination of Common Stock. If the Company
shall at any time after the Closing Date subdivide its outstanding shares of
Common Stock into a greater number of shares (by any stock split, stock dividend
or otherwise), then the Antidilution Price in effect immediately prior to such
subdivision shall be proportionately reduced, and, conversely, if the Company
shall at any time after the Closing Date combine its outstanding shares of
Common Stock into a smaller number of shares (by any reverse stock split or
otherwise), then the Antidilution Price in effect immediately prior to such
combination shall be proportionately increased.

            (b)   Reorganization or Reclassification. If any capital
reorganization or reclassification of the capital stock of the Company shall be
effected at any time after the Closing Date in such a way that holders of Common
Stock shall be entitled to receive stock, securities or assets with respect to
or in exchange for Common Stock, then, as a condition of such reorganization or
reclassification, lawful and adequate provisions shall be made whereby the
Holder shall thereupon have the right to receive, upon the basis and upon the
terms and conditions specified herein and in lieu of the Warrant Shares
immediately theretofore receivable upon the exercise of this Warrant in full, as
the case may be, such shares of stock, securities or assets as may be issued or
payable with respect to or in exchange for a number of outstanding shares of
such Common Stock equal to the number of shares of such Common Stock immediately
theretofore receivable upon such exercise of this Warrant in full had such
reorganization or reclassification not taken place, and in any such case
appropriate provisions shall be made with respect to the rights and interests of
the Holder to the end that the provisions hereof (including, without limitation,
provisions for adjustments of the Antidilution Price) shall thereafter be
applicable, as nearly as may be, in relation to any shares of stock, securities
or assets thereafter deliverable upon the exercise of such conversion rights.

            (c)   Dividends and Distributions.

                  (i)   Stock Dividends. If the Company at any time or from time
to time after the Closing Date declares a dividend or makes any other
distribution upon any stock of the Company other than its Common Stock, that is
payable in Common Stock, Options or Convertible Securities, then any such Common
Stock, Options or Convertible Securities, as the case may be, issuable in
payment of such dividend or distribution shall be deemed to have been issued or
sold without consideration, and the Antidilution Price shall be adjusted
pursuant to Section 2.2(d); provided, however, that no adjustment shall be made
to the Antidilution Price as a result of such dividend or distribution if
holders of not less than two-thirds of the Warrant Shares then issuable with
respect to outstanding Warrants, on behalf of themselves and all other Holders,
each of whom shall be bound thereby, (a "TWO-THIRDS INTEREST") elect to receive
and actually receive such dividend or distribution in the manner contemplated by
Section 2.2(c)(ii)(B); provided, further, that if any adjustment is made to the
Antidilution Price as a result of the declaration of a dividend and such
dividend is not effected, the Antidilution Price shall be appropriately
readjusted.

                  (ii)  Other Dividends and Distributions. If the Company at any
time or from time to time after the Closing Date makes or issues, or fixes a
record date for the determination of holders of Common Stock entitled to
receive, a dividend or other distribution payable in:

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                        (A)   securities or other property of the Company other
            than shares of Common Stock, Options or Convertible Securities, then
            in each such event provision shall be made so that the Holder of
            this Warrant shall receive upon exercise thereof, in addition to the
            number of shares of Common Stock purchasable thereupon, the amount
            of such other securities of the Company or the value of such other
            property that they would have received had this Warrant been
            exercised for Common Stock on the record date of such event and had
            such Holder thereafter, during the period from the date of such
            event to and including the exercise date, retained such securities
            or other property receivable by such Holder during such period
            giving application to all adjustments called for during such period
            under Section 2 with respect to the rights of such Holder; and,
            provided, further, however, that no such adjustment shall be made if
            the Holder of this Warrant receives simultaneously with all other
            recipients, upon the election of a Two-Thirds Interest, a dividend
            or other distribution of such securities or other property in an
            amount equal to the amount of such securities or other property as
            such Holder would have received if this Warrant had been exercised
            for Common Stock on the record date of such event and, upon such
            election, the Holder shall receive such dividend or distribution as
            if the Holders had exercised all of the Warrants in full on the date
            such record is taken; and

                        (B)   Common Stock, Options or Convertible Securities,
            then a Two-Thirds Interest shall be entitled to elect to receive
            such dividend or distribution as if the Holders had exercised all of
            the Warrants in full on the date such record is taken; provided,
            however, that in the event a Two-Thirds Interest so elects and all
            of the Holders actually receive such dividend or distribution, the
            Antidilution Price shall not be adjusted pursuant to the provisions
            of Section 2.2 with respect to such dividend or distribution. In the
            event no such election is made, the provisions of Section 2.2(d)
            shall apply with respect to such dividend or distribution.

            (d)   Issuances. Except as provided in Sections 2.2(c) and
2.2(d)(vii) and except in the case of an event described in Section 2.2(a), if
at any time after the Closing Date, the Company issues or sells, or is, in
accordance with this Section 2.2(d), deemed to have issued or sold, any shares
of Common Stock for a consideration per share less than the Antidilution Price
in effect immediately prior to such issuance or sale, then, upon such issuance
or sale (or deemed issuance or sale), the Antidilution Price shall be reduced to
the price determined by dividing (x) the sum of (A) the Common Stock Deemed
Outstanding (as defined below) immediately prior to such issuance or sale (or
deemed issuance or sale) multiplied by the Antidilution Price then in effect and
(B) the consideration, if any, received by the Company upon such issuance or
sale (or deemed issuance or sale) by (y) the Common Stock Deemed Outstanding
immediately after such issuance or sale (or deemed issuance or sale).

      For purposes of this Section 2.2(d), the following shall also be
applicable:

                  (i)   Issuance of Rights or Options. If the Company, at any
time after the Closing Date, in any manner, grants (whether directly or by
assumption in a merger or otherwise) any warrants or other rights to subscribe
for or to purchase, or any options to

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purchase, shares of Common Stock or any stock or security convertible into or
exercisable or exchangeable for Common Stock (such warrants, rights or options
being called "OPTIONS" and such convertible or exercisable or exchangeable stock
or securities being called "CONVERTIBLE SECURITIES"), in each case for
consideration per share (determined as provided in this paragraph and in Section
2.2(d)(iv)) less than the Antidilution Price then in effect, whether or not such
Options or Convertible Securities are immediately exercisable, convertible or
exchangeable, then the total maximum number of shares of Common Stock issuable
upon the exercise of such Options, or upon conversion or exchange of the total
maximum amount of such Convertible Securities issuable upon exercise of such
Options, shall be deemed to have been issued as of the date of granting of such
Options, at a price per share equal to the amount determined by dividing (A) the
total amount, if any, received or receivable by the Company as consideration for
the issuance of such Options, plus the minimum aggregate amount of additional
consideration payable to the Company upon the exercise of all such Options,
plus, in the case of such Options that relate to Convertible Securities, the
minimum aggregate amount of additional consideration, if any, payable upon the
issuance or sale of such Convertible Securities and upon the conversion or
exchange of Convertible Securities, by (B) the total maximum number of shares of
Common Stock deemed to have been so issued. Except as otherwise provided in
Section 2.2(d)(iii), no adjustment of the Antidilution Price shall be made upon
the actual issuance of such Common Stock or of such Convertible Securities upon
exercise of such Options or upon the actual issuance of such Common Stock upon
conversion or exchange of such Convertible Securities.

                  (ii)  Issuance of Convertible Securities. If the Company, at
any time after the Closing Date, in any manner, issues or sells any Convertible
Securities for consideration per share (determined as provided in this paragraph
and in Section 2.2(d)(iv)) less than the Antidilution Price then in effect,
whether or not the right to exchange or convert any such Convertible Securities
is immediately exercisable, then the total maximum number of shares of Common
Stock issuable upon conversion or exchange of all such Convertible Securities
shall be deemed to have been issued as of the date of the issuance or sale of
such Convertible Securities, at a price per share equal to the amount determined
by dividing (A) the total amount, if any, received or receivable by the Company
as consideration for the issuance or sale of such Convertible Securities, plus
the minimum aggregate amount of additional consideration, if any, payable to the
Company upon the conversion or exchange thereof, by (B) the total maximum number
of shares of Common Stock deemed to have been so issued; provided, however, that
(1) except as otherwise provided in Section 2.2(d)(iii), no adjustment of the
Antidilution Price shall be made upon the actual issuance of such Common Stock
upon conversion or exchange of such Convertible Securities and (2) if any such
issuance or sale of such Convertible Securities is made upon exercise of any
Options to purchase any such Convertible Securities, no further adjustment of
the Antidilution Price shall be made by reason of such issuance or sale.

                  (iii) Change in Option Price or Conversion Rate; Termination
of Options or Convertible Securities. If at any time after the Closing Date a
change occurs in (A) the maximum number of shares of Common Stock issuable in
connection with any Option referred to in Section 2.2(d)(i) or any Convertible
Securities referred to in Section 2.2(d)(i) or (ii), (B) the purchase price
provided for in any Option referred to in Section 2.2(d)(i), (C) the additional
consideration, if any, payable upon the conversion or exchange of any
Convertible Securities referred to in Section 2.2(d)(i) or (ii), or (D) the rate
at which Convertible Securities

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referred to in Section 2.2(d)(i) or (ii) are convertible into or exchangeable
for Common Stock (in each case, other than in connection with an event described
in Section 2.2(a)(vii)), then the Antidilution Price in effect at the time of
such event shall be readjusted to the Antidilution Price that would have been in
effect at such time had such Options or Convertible Securities that remain
outstanding provided for such changed maximum number of shares, purchase price,
additional consideration or conversion rate, as the case may be, at the time
initially granted, issued or sold. Upon the termination of any such Option or
any such right to convert or exchange such Convertible Securities, the
Antidilution Price then in effect hereunder shall be increased to the
Antidilution Price that would have been in effect at the time of such
termination had such Option or Convertible Securities, to the extent outstanding
immediately prior to such termination (i.e., to the extent that fewer than the
number of shares of Common Stock deemed to have been issued in connection with
such Option or Convertible Securities were actually issued), never been issued
or been issued at such higher price, as the case may be.

                  (iv)  Consideration for Stock. In case any shares of Common
Stock are issued or sold, or deemed issued or sold, at any time after the
Closing Date for cash, the consideration received therefor shall be deemed to be
the amount received or to be received by the Company therefor (determined with
respect to deemed issuances and sales in connection with Options and Convertible
Securities in accordance with clause (A) of Section 2.2(d)(i) or Section
2.2(d)(ii), as appropriate) determined in the manner set forth below in this
Section 2.2(d)(iv). If any shares of Common Stock are issued or sold, or deemed
issued or sold, for a consideration other than cash, the amount of the
consideration other than cash received by the Company shall be deemed to be the
fair value of such consideration received or to be received by the Company
(determined with respect to deemed issuances and sales in connection with
Options and Convertible Securities in accordance with clause (A) of Section
2.2(d)(i) or Section 2.2(d)(ii), as appropriate) as determined in good faith by
the Board of Directors of the Company (the "BOARD OF DIRECTORS") and Holders
holding a Two-Thirds Interest. If any Options are issued in connection with the
issuance and sale of other securities of the Company, together comprising one
integral transaction in which no specific consideration is allocated to such
Options by the parties thereto, such Options shall be deemed to have been issued
for such consideration as determined in good faith by the Board of Directors and
a Two-Thirds Interest; provided, that if the Company and a Two-Thirds Interest
are unable to reach agreement as to the value of such consideration, then the
value thereof will be determined by an independent appraisal by a mutually
agreed to investment banker, the fees of which shall be paid by the Company.

                  (v)   Other Issuances or Sales; Indeterminable Amounts. In
calculating any adjustment to the Antidilution Price pursuant to this Section
2.2(d), any Options or Convertible Securities that provide, as of the effective
date of such adjustment, for the issuance upon exercise or conversion thereof of
an indeterminable number of shares of Common Stock shall (together with the
shares of Common Stock issuable upon exercise or conversion thereof) be
disregarded for purposes of the calculation of Common Stock Deemed Outstanding;
provided, that at such time as a number of shares of Common Stock issuable upon
exercise or conversion of such Options or Convertible Securities becomes
determinable, then the Antidilution Price shall be adjusted as provided in
Section 2.2(d)(iii).

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                  (vi)  Common Stock Deemed Outstanding. The term "COMMON STOCK
DEEMED OUTSTANDING" shall mean the sum of (A) the number of shares of Common
Stock outstanding immediately prior to the Closing Date reduced by the number of
shares of Common Stock to be redeemed by the Company upon consummation of the
Redemption (as such term is defined in that certain Stock Purchase Agreement
dated as of the Closing Date by and among the Company, the Stockholders (as
defined therein) and the Investors (as defined therein)) (including for this
purpose all shares of Common Stock issuable upon exercise or conversion of any
outstanding Options or Convertible Securities outstanding or renewed for
issuance under the Company's 2003 Stock Option and Grant Plan immediately prior
to the Closing Date), plus (B) the number of shares of Common Stock issued or
sold (or deemed issued or sold) after the date hereof, the issuance or sale of
which resulted in an adjustment to the Antidilution Price pursuant to Section
2.2(d), plus (C) the number of shares of Common Stock deemed issued or sold
pursuant to Section 2.2(d)(v)(A) above; provided, that Common Stock Deemed
Outstanding shall not include shares of Series A Convertible Preferred Stock of
the Company or any shares of Common Stock issuable upon exercise of the
Convertible Securities or the Warrants.

                  (vii) Certain Issues of Common Stock Excepted. Anything herein
to the contrary notwithstanding, the Company shall not be required to make any
adjustment of the Antidilution Price in the case of the issuance from and after
the Closing Date of (i) shares of Common Stock upon conversion of shares of
Series A Convertible Preferred Stock of the Company or exercise of the Warrants;
(ii) shares of Common Stock or options therefor (appropriately adjusted for
stock splits, stock dividends, recapitalizations and the like) to directors,
officers, employees or consultants of the Company in connection with their
service as directors of the Company, their employment by the Company or their
retention as consultants by the Company, in each case authorized by the Board of
Directors and issued pursuant to the Company's equity incentive plans; (iii)
securities issued as consideration for the purchase of stock or assets in any
acquisition, merger, joint venture, partnership or other strategic alliance,
(iv) securities issued in connection with any debt financing or refinancing of
the Company or (v) securities issued that are deemed in writing by the holders
of a majority of the Warrant Shares issuable upon exercise of the Warrants to
constitute Excluded Shares (collectively, "EXCLUDED SHARES").

            (e)   Adjustment for Merger or Consolidation, etc.

                  (i)   Upon any merger or consolidation of the Company with or
      into another corporation (or other legal entity), or any sale of all or
      substantially all of the assets of the Company to another corporation (or
      other legal entity), this Warrant shall thereafter be exercisable (or
      shall be converted into a security that shall be exercisable) for the kind
      and amount of shares of stock or other securities or property to which a
      Holder of the number of shares of Common Stock of the Company deliverable
      upon the exercise of this Warrant in full would have been entitled upon
      such merger, consolidation, or asset sale (and any distribution of assets
      to stockholders following such asset sale); and, in such case, appropriate
      adjustment (as determined in good faith by the Board of Directors) shall
      be made in the application of the provisions in Section 2.2 set forth with
      respect to the rights and interests thereafter of the Holder, to the end
      that the provisions set forth in Section 2.2 (including provisions with
      respect to changes in and

                                        8

<PAGE>

      other adjustments of the Antidilution Price) shall thereafter be
      applicable, as nearly as possible, in relation to any shares of stock or
      other securities or property thereafter deliverable upon the exercise of
      this Warrant.

                  (ii)  The Company shall not effect any such consolidation,
      merger or sale, unless prior to or simultaneously with the consummation
      thereof, the successor (if other than the Company) resulting from such
      consolidation or merger or the person purchasing such assets shall assume
      by written instrument executed and delivered to the Holder, the obligation
      to deliver to the Holder such shares, securities or assets as, in
      accordance with the foregoing provisions, the Holder may be entitled to
      receive upon the exercise of this Warrant (or the security into which such
      Warrant is to be converted in connection with the consummation of such
      transaction).

            (f)   Record Date. If the Company takes a record of the Holders of
its Common Stock for the purpose of entitling them (A) to receive a dividend or
other distribution payable in Common Stock, Options or Convertible Securities,
or (B) to subscribe for or purchase Common Stock, Options or Convertible
Securities, then such record date shall be deemed to be the date of the issuance
or sale of the shares of Common Stock deemed to have been issued or sold upon
the declaration of such dividend or the making of such other distribution or the
date of the granting of such right of subscription or purchase, as the case may
be.

            (g)   Other Dilutive Events. In case any event shall occur after the
Closing Date as to which, but for this Section 2.2(g), the provisions of this
Section 2 are not directly applicable, and the failure to make any adjustment
would not in the opinion of a Two-Thirds Interest fairly protect the purchase
rights represented by this Warrant in accordance with the essential intent and
principles of such sections, then, in each case, at the request of a Two-Thirds
Interest, the Company shall appoint a firm of independent investment bankers of
recognized national standing (which shall be completely independent of the
Company and shall be satisfactory to a Two-Thirds Interest), which shall give
its opinion upon the adjustment, if any, on the basis consistent with the
essential intent and principles established in this Section 2, necessary to
preserve, without dilution, the purchase rights by this Warrant. Upon receipt of
such opinion, the Company shall promptly mail a copy thereof to the Holder and
shall make the adjustments described therein.

SECTION 3. REDEMPTION AND CANCELLATION OF WARRANTS

      3.1.  PUT RIGHT. (a) At any time after September 30, 2008, the Holder may
require that the Company purchase this Warrant in whole at the Redemption Price
(as defined below) by delivery of a written notice to the Company (the date such
notice is delivered to the Company shall hereinafter be referred to as, the "PUT
DEMAND DATE"). The Company shall pay the Redemption Price to such Holders as
soon as reasonably practicable (the "PUT PAYMENT DATE"), but in no event later
than ten (10) days after the Put Demand Date (the "PUT DEMAND PERIOD"), upon
surrender of this Warrant to the Company or, if requested by such Holder without
surrender of this Warrant, by wire transfer of immediately available funds to an
account or accounts designated in writing by the Holder.

                                        9

<PAGE>

            (b)   Upon surrender of this Warrant in accordance with the
procedures set forth in Section 3.1(a), the right to purchase shares of Common
Stock represented by this Warrant shall terminate, and this Warrant shall
represent the right of the Holder to receive only the applicable Redemption
Price from the Company in accordance with Section 3.1. The Holder's right to
demand redemption of this Warrant pursuant to this Section 3.1 shall be referred
to herein as the Holder's "PUT RIGHT."

      3.2.  DEFAULT; AUTOMATIC CONVERSION INTO DEBT. In the event that the
Company fails to purchase this Warrant prior to the expiration of the Put Demand
Period, then the exercise by the Holder of the Put Right pursuant to this
Section 3 shall automatically be rescinded, unless prior to the expiration of
the Put Demand Period the Holder elects to irrevocably convert without any
further action or acknowledgment on the part of the Company or any other Holder
all of the rights heretofore represented by this Warrant, including the Holder's
right to purchase shares of Common Stock represented by this Warrant, into an
unsecured obligation of the Company to pay to such Holder, within one (1) year
of the Put Demand Date, an amount equal to the Redemption Price, together with
accrued interest (based on a 360-day year of 30-day months) on the unpaid
principal amount thereof at a rate of twelve percent (12%) per annum, accruing
daily in arrears and compounding quarterly until such obligation is paid or
prepaid in full, provided that the Company shall use its best efforts to repay
obligation in full as soon as possible. The rate of interest payable on such
obligation shall increase by one percent (1%) as of the end of each ninety (90)
day period after the Put Demand Period until such obligation is paid or prepaid
in full or until such interest rate reaches the maximum rate permitted by
applicable law, provided, however, that in the event that fulfillment of any
provision hereof results in such rate of interest being in excess of such
maximum rate, the amount of interest required to be paid hereunder shall
automatically be reduced to eliminate such excess. Nothing in this Section 3
shall require the Company to pay interest at a rate in excess of the maximum
rate permitted by applicable law. The obligation of the Company created pursuant
to this Section 3.2 may be prepaid by the Company at any time without premium or
penalty. All payments of principal and interest on such obligation shall be made
by wire transfer of immediately available funds to an account or accounts
designated in writing by the Holder. All payments made under this Section 3
shall be made pro-rata to all Holders who have exercised their right to convert
the Warrant into a debt obligation of the Company pursuant to this Section 3,
based on the aggregate amount of outstanding principal with respect to such
obligations.

SECTION 4. COVENANTS OF THE COMPANY

      4.1.  The Company covenants and agrees that:

            (a)   all shares of Common Stock that may be issued upon the
exercise of the rights represented by this Warrant shall, upon issuance, be duly
authorized, validly issued, fully paid and nonassessable;

            (b)   during the period within which this Warrant may be exercised,
it will at all times have authorized and reserved a sufficient number of shares
of Common Stock to provide for the exercise of rights represented by this
Warrant;

                                       10

<PAGE>

            (c)   if any shares of Common Stock reserved or to be reserved to
provide for the exercise of this Warrant require registration with or approval
of any governmental or self-regulatory authority under any federal or state law
or stock exchange or NASDAQ rule before such shares may be validly issued, then
it shall in good faith and as expeditiously as possible endeavor to secure such
registration or approval, as the case may be;

            (d)   if it shall have filed a registration statement pursuant to
the requirements of Section 12 of the Securities and Exchange Act of 1934, as
amended (the "EXCHANGE ACT"), or a registration statement pursuant to the
requirements of the Securities Act, the Company shall comply with the reporting
requirements of Sections 13 and 15(d) of the Exchange Act and will comply with
all other public information reporting requirements the securities and exchange
commission (including Rule 144 promulgated by such commission under the
Securities Act) from time to time in effect and relating to the availability of
an exemption from the Securities Act for the sale of any restricted securities;
and

            (e)   it shall not, by amendment to its certificate of incorporation
(whether by way of merger, operation of law, or otherwise) or reorganization,
transfer of assets, consolidation, merger, dissolution, issuance or sale of
securities, agreement or any other 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 and shall at all times in good faith assist in the
carrying out of all the provisions of this Warrant and in the taking of all such
action as may be necessary or appropriate in order to protect the rights of the
Holder against impairment as if the Holder was a shareholder of the Company
entitled to the benefit of fiduciary duties afforded to stockholders under
Illinois law. Any successor to the Company shall agree in writing, as a
condition to such succession, to carry out and observe the obligations of the
Company hereunder with respect to this Warrant.

SECTION 5. TRANSFER

      5.1.  REGISTRATION.

            (a)   Registration. The Company shall number and register the
Warrants in a register maintained at the principal office of the Company (the
"OFFICE"). The Company shall be entitled to treat the Holder of the Warrants as
the owner thereof for all purposes and shall not be bound to recognize any
equitable or other claim to or interest in such Warrants on the part of any
other person. Any Warrant may be transferred or endorsed to another party in
whole or in part by surrendering to the Company, or its duly authorized agent,
for cancellation the existing warrant certificate evidencing the Warrant to be
transferred, endorsed or accompanied by a written instrument of transfer, in
form reasonably satisfactory to the Company, duly executed by the Holder thereof
in person or by a duly authorized representative, agent or attorney-in-fact
appointed in writing.

      5.2.  RESTRICTIVE LEGEND.

            (a)   This Warrant and the Warrant Shares issuable upon exercise
thereof, are subject to the terms of that certain Stockholders Agreement, dated
as of the date hereof, by and

                                       11

<PAGE>

among the Company and the Stockholders and Investors party thereto (the
"STOCKHOLDERS AGREEMENT"). Each certificate representing shares of Common Stock
issued upon exercise of this Warrant and each certificate representing shares of
Common Stock issued to any subsequent transferee of any such certificate, shall
be stamped or otherwise imprinted with a legend in substantially the form as
follows:

      THE SECURITIES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED UNDER THE
      SECURITIES ACT OF 1933, AS AMENDED (THE "SECURITIES ACT"), OR ANY STATE
      SECURITIES LAWS AND MAY NOT BE OFFERED, SOLD, TRANSFERRED, HYPOTHECATED OR
      OTHERWISE ASSIGNED EXCEPT (1) PURSUANT TO A REGISTRATION STATEMENT WITH
      RESPECT TO SUCH SECURITIES WHICH IS EFFECTIVE UNDER THE SECURITIES ACT OR
      TO AN AVAILABLE EXEMPTION FROM REGISTRATION UNDER THE ACT RELATING TO THE
      DISPOSITION OF SECURITIES AND (2) IN ACCORDANCE WITH APPLICABLE STATE
      SECURITIES LAWS.

            (b)   If at any time any securities other than shares of Common
Stock shall be issuable upon the exercise of this Warrant, such securities shall
bear a legend similar to the one set forth above. Whenever the legend
requirement imposed by the Stockholders Agreement shall terminate, the Holder
shall be entitled to receive within five (5) Business Days from the Company, at
the Company's expense, a new Warrant certificate or certificates and new stock
certificates representing Common Stock issued upon exercise of this Warrant, in
each case, without such legends.

      5.3.  REGISTRATION OF WARRANTS AND COMMON STOCK. The shares of Common
Stock issuable upon exercise of this Warrant shall constitute Registrable
Securities (as such term is defined in the Registration Rights Agreement dated
as of the date hereof by and among the parties therein). Each holder of any
shares of Common Stock (and other securities) issued upon exercise of this
Warrant shall be entitled to all of the benefits afforded to a holder of any
such Registrable Securities under the Registration Rights Agreement and such
holder, by its acceptance of this Warrant, agrees to be bound by and to comply
with the terms and conditions of the Registration Rights Agreement applicable to
such holder as a holder of such Registrable Securities. At any such time as
Common Stock is listed on any national securities exchange, the Company will, at
its sole expense, obtain promptly and maintain the approval for listing on each
such exchange, upon official notice of issuance, the shares of Common Stock
issuable upon exercise of the then outstanding Warrants and maintain the listing
of such shares after their issuance; and the Company will also list on such
national securities exchange, and will maintain such listing of, any other
securities that at any time are issuable upon exercise of the Warrants, if and
at the time that any securities of the same class shall be listed on such
national securities exchange by the Company.

SECTION 6. MISCELLANEOUS

      6.1.  NOTICE OF ADJUSTMENTS.

                                       12

<PAGE>

            (a)   In each case of any adjustment or readjustment in the Warrant
Price and the Warrant Shares issuable upon exercise of this Warrant, the Company
shall promptly thereafter compute such adjustment or readjustment in accordance
with the terms of this Warrant and provide written report thereof certified by
the Chief Financial Officer or Treasurer of the Company to the Holder stating
the number of Warrant Shares and the Warrant Price, after giving effect to such
adjustment or readjustment, and setting forth in reasonable detail the method of
calculation and the facts upon which such calculation is based.

            (b)   The Company shall, within (10) days of receipt of a written
request by a Two-Thirds Interest, cause independent certified public accountants
of recognized national standing, which may be the regular auditors of the
Company, selected by the Company to verify such computations reported pursuant
to Section 6.1(a), other than any computation that pursuant to the provisions of
this Warrant are to be determined reasonably and in good faith by the Board of
Directors. The Company shall promptly prepare, and remit to the Holders, a copy
of such independent accountant's report setting forth such adjustment or
readjustment, showing in reasonable detail the method of calculation thereof and
the facts upon which such adjustment or readjustment is based, including a
statement of:

                  (i)   the consideration received or to be received by the
      Company for any shares of Common Stock, Options, or Convertible Securities
      issued or sold or deemed to have been issued;

                  (ii)  the Common Stock Deemed Outstanding; and

                  (iii) the Antidilution Price in effect immediately prior to
      such issuance or sale and as adjusted or readjusted.

            (c)   The Company shall also keep copies of all such reports
generated pursuant to this Section 6.1 at its principal offices and will cause
the same to be available for inspection at such offices during normal business
hours by the Holder or any prospective purchaser of this Warrant designated by
Holder.

      6.2.  NOTICE OF CERTAIN EVENTS. In case at any time:

            (a)   the Company shall pay any dividend upon, or make any
distribution in respect of, its stock of the Company;

            (b)   the Company shall propose to register any of its equity
securities under the Securities Act in connection with a public offering;

            (c)   there shall be any proposed capital reorganization, or
reclassification of the capital stock, of the Company, or consolidation or
merger of the Company with, or sale of all or substantially all of its assets
to, another person; or

            (d)   there shall be a voluntary or involuntary dissolution,
liquidation or winding up of the Company;

                                       13

<PAGE>

then, in any one (1) or more of said cases, the Company shall give notice to
Holder of the date on which (i) the books of the Company shall close or a record
shall be taken for such dividend, distribution or subscription rights, or (ii)
such public offering, reorganization, reclassification, consolidation, merger,
sale, dissolution, liquidation or winding up shall take place, as the case may
be. Such notice shall be given not less than ten (10) days prior to the record
date or the date on which the transfer books of the Company are to be closed in
respect thereto in the case of an action specified in clause (i) and at least
twenty (20) days prior to the action in question in the case of an action
specified in clause (ii).

      6.3.  NOTICE. Any notice that is required or provided to be given under
this Warrant shall be deemed to have been sufficiently given and received for
all purposes when delivered in writing by hand, telecopy, telex or other method
of facsimile, or five (5) days after being sent by certified or registered mail,
postage and charges prepaid, return receipt requested, or two (2) days after
being sent by overnight delivery providing receipt of delivery, to the following
addresses: if to the Company, Eagle Test Systems, Inc., 620 South Butterfield
Road, Mundelin, IL 60060-4483, Attention: Len Foxman and Ted Foxman, Facsimile:
(847) 367-8640, with a copy to Katten Muchin Zavis Rosenman, 525 West Monroe
Street, Suite 1600, Chicago, IL 60661-3693, Attention: Howard S. Lanznar,
Facsimile: (312) 902-1061, or at any other address designated by the Company, to
Holder; if to Holder, c/o TA Associates, Inc., 125 High Street, Suite 2500,
Boston, MA 02110, Attention: Michael C. Child and Jameson J. McJunkin,
Facsimile: (617) 574-6728, or at any other address designated by Holder to the
Company in writing.

      6.4.  NO CHANGE IN WARRANT TERMS ON ADJUSTMENT. Irrespective of any
adjustment in the Antidilution Price or the number of shares of Common Stock,
this Warrant, whether theretofore or thereafter issued or reissued, may continue
to express the same price and number of shares of Common Stock as are stated
herein and the Antidilution Price and such number of Common Stock shares
specified herein shall be deemed to have been so adjusted.

      6.5.  ISSUANCE AND TRANSFER TAXES. The issuance of certificates for shares
of Common Stock upon any exercise of this Warrant shall be made without charge
to Holder for any issuance tax in respect thereto.

      6.6.  EXCHANGE OF WARRANT. This Warrant is exchangeable at no cost to the
Holder upon the surrender hereof by Holder at such office or agency of the
Company, for a new warrant of like tenor representing in the aggregate the right
to subscribe for and purchase the number of shares that may be subscribed for
and purchased hereunder from time to time after giving effect to all the
provisions hereof, each of such new warrants to represent the right to subscribe
for and purchase such number of shares as shall be designated by said Holder
hereof at the time of such surrender.

      6.7.  LOST, STOLEN, MUTILATED OR DESTROYED WARRANT. If this Warrant is
lost, stolen, mutilated or destroyed, the Company shall at no cost to the
Holder, on such terms as to indemnity or otherwise as it may in its discretion
impose (which shall, in the case of a mutilated Warrant, include the surrender
thereof), issue a new warrant of like denomination and tenor as the Warrant so
lost, stolen, mutilated or destroyed. Any such new warrant shall constitute an
original contractual obligation of the Company, whether or not the allegedly
lost, stolen, mutilated or destroyed Warrant shall be at any time enforceable by
anyone.

                                       14

<PAGE>

      6.8.  GOVERNING LAW. This Warrant shall be deemed to be a contract made
under, and shall be construed in accordance with, the laws of the State of
Illinois, without giving effect to conflict of laws principles thereof.

      6.9.  SECTION HEADINGS; CONSTRUCTION. The descriptive headings in this
Warrant have been inserted for convenience only and shall not be deemed to limit
or otherwise affect the construction of any provision thereof or hereof. The
parties have participated jointly in the negotiation and drafting of this
Warrant and the other agreements, documents and instruments executed and
delivered in connection herewith with counsel sophisticated in investment
transactions. In the event an ambiguity or question of intent or interpretation
arises, this Warrant shall be construed as if drafted jointly by the parties and
no presumption or burden of proof shall arise favoring or disfavoring any party
by virtue of the authorship of any provisions of this Warrant and the
agreements, documents and instruments executed and delivered in connection
herewith.

      6.10. DISPUTE RESOLUTION. All disputes, claims, or controversies arising
out of or relating to this Warrant or the negotiation, breach, validity or
performance hereof that are not resolved by mutual agreement shall be resolved
solely and exclusively in accordance with the arbitration provisions set forth
in Section 8.10 of the Stockholders Agreement. The parties understand and agree
that this arbitration shall apply equally to claims of fraud or fraud in the
inducement.

      6.11. CONSENT TO JURISDICTION. Except as provided in Section 6.10, each of
the parties hereto irrevocably and unconditionally consents to the jurisdiction
of J.A.M.S./Endispute, Inc. to resolve all disputes, claims or controversies
arising out of or relating to this Warrant or the negotiation, breach, validity
or performance hereof, and further consents to the sole and exclusive
jurisdiction of (a) the United States District Court for the Northern District
of Illinois and (b) the federal courts of the State of California for the
purposes of enforcing the arbitration provisions of Section 6.10 of this
Warrant. Each party further irrevocably waives any objection to proceeding
before the Arbitrator based upon lack of personal jurisdiction or to the laying
of venue and further irrevocably and unconditionally waives and agrees not to
make a claim in any court that arbitration before the Arbitrator has been
brought in an inconvenient forum. Each of the parties hereto hereby consents to
service of process by registered mail at the address to which notices are to be
given. Each of the parties hereto agrees that its or his submission to
jurisdiction and its or his consent to service of process by mail is made for
the express benefit of the other parties hereto.

      6.12. REMEDIES; SEVERABILITY. Notwithstanding Sections 6.10 and 6.11, it
is specifically understood and agreed that any breach of the provisions of this
Warrant by any person subject hereto will result in irreparable injury to the
other parties hereto, that the remedy at law alone will be an inadequate remedy
for such breach, and that, in addition to any other remedies which they may
have, such other parties may enforce their respective rights by actions for
specific performance (to the extent permitted by law). Whenever possible, each
provision of this Warrant shall be interpreted in such a manner as to be
effective and valid under applicable law, but if any provision of this Warrant
shall be deemed prohibited or invalid under such applicable law, such provision
shall be ineffective to the extent of such prohibition or invalidity,

                                       15

<PAGE>

and such prohibition or invalidity shall not invalidate the remainder of such
provision or the other provisions of this Warrant.

      6.13. INTEGRATION. This Warrant, the Stockholders Agreement, the
Registration Rights Agreement and the Purchase Agreement, including the exhibits
referred to herein and therein, constitute the entire agreement and supersede
all other prior agreements and understandings, both written and oral, among the
parties with respect to the subject matter hereof.

      6.14. NO RIGHTS OR LIABILITIES AS STOCKHOLDER. Except as expressly set
forth herein, nothing contained in this Warrant shall be construed as conferring
upon the Holder any rights as a shareholder of the Company or as imposing any
obligation on the Holder to purchase any securities or as imposing any
liabilities on the Holder as a shareholder of the Company, whether such
obligation or liabilities are asserted by the Company or creditors of the
Company.

      6.15. WAIVERS AND CONSENTS; AMENDMENTS.

            (a)   For the purposes of this Warrant and all documents executed
pursuant hereto, no course of dealing between or among any of the parties hereto
and no delay on the part of any party hereto in exercising any rights hereunder
or thereunder shall operate as a waiver of the rights hereof or thereof. No
covenant or provision hereof may be waived otherwise than by a written
instrument signed by the party or parties so waiving such covenant or other
provision contemplated herein.

            (b)   No amendment to this Warrant may be made without the written
consent of the Company and the Holder.

      6.16. CERTAIN DEFINITIONS. The following terms as used in this Warrant
shall have the following meanings:

            (a)   "APPRAISER" means an independent nationally recognized
investment bank or other qualified financial institution acceptable to the
Company and the Noteholders (as such term is defined in the Purchase Agreement).

            (b)   "BUSINESS DAY" means any day other than a Saturday or a Sunday
or a day on which commercial banking institutions in the State of New York are
authorized or obligated by law or executive order to be closed. Any reference to
"days" (unless Business Days are specified) shall mean calendar days.

            (c)   "CODE" means the Internal Revenue Code of 1986, as amended.

            (d)   "FAIR MARKET VALUE" means either (i) the Market Price, if any,
of a share of Common Stock or (ii) if no Market Price exists, the value (which
shall not take into effect any minority discounts) of a share of Common Stock as
determined by a nationally recognized investment banking firm or accounting firm
designated by Holders representing a majority of the Warrant Shares issuable
upon exercise of the Warrants and reasonably acceptable to the Company; provided
that if the parties cannot agree on such a firm, each party shall choose a
nationally recognized investment banking firm, which shall choose a third
nationally recognized

                                       16

<PAGE>

firm and that third firm shall determine the Fair Market Value, which
determination shall be final and binding. The cost relating to retaining any
such firm(s) pursuant to this definition shall be borne by the Company.

            (e)   "MARKET PRICE" of any security means the value determined in
accordance with the following provisions:

                  (i)   if such security is listed on a national securities
      exchange registered under the Exchange Act, a price equal to the average
      of the closing sales prices for such security on such exchange for each
      day during the twenty (20) consecutive trading days immediately preceding
      the date in question; and

                  (ii)  not so listed, and such security is quoted on NASDAQ, a
      price equal to the average of the closing bid and asked prices for such
      security quoted on such system each day during the 20 consecutive trading
      days immediately preceding the date in question.

            (f)   "REDEMPTION PRICE" means the greater of (i) the Fair Market
Value of the Warrant as of the Put Demand Date and (ii) the Fair Market Value of
the Warrant as of the Put Payment Date (or if the Company fails to pay the
Redemption Price on the Put Payment Date, the first day following the Put Demand
Period), as determined by an Appraiser (as defined above) and based upon on
independent valuation of the Company. In arriving at its determination, the
Appraiser shall base any valuation upon, in the case of the Market Price of the
Common Stock, the Market Price of the Company assuming (A) the exercise of all
outstanding warrants, options or rights to subscribe for or purchase Common
Stock (or other securities) of the Company or other securities immediately
exercisable or convertible into Common Stock (or other securities) of the
Company and (B) the Company were sold as a going concern, without regard to the
existence of any control block, the anticipated impact upon current market
prices of any such sale, any discount for minority ownership or the lack or
depth of a market for the Common Stock, the Warrants or other securities of the
Company, or any other factors concerning the liquidity or marketability of the
Common Stock, the Warrants, or other securities of the Company.

      6.17. OTHER DEFINITIONAL PROVISIONS.

            (a)   Except as otherwise specified herein, all references herein:

                  (i)   to any person other than the Company, shall be deemed to
      include such person's successors and assigns;

                  (ii)  to the Company shall be deemed to include the Company's
      successors; and

                  (iii) to any applicable law defined or referred to herein,
      shall be deemed references to such applicable law as the same may have
      been or may be amended or supplemented from time to time.

                                       17

<PAGE>

            (b)   When used in this Warrant, the words "herein", "hereof' and
"hereunder", and words of similar import, shall refer to this Warrant as a whole
and not to any provision of this Warrant, and the words "Section" and "Exhibit"
shall refer to Sections of, and Exhibits to, this Warrant unless otherwise
specified.

            (c)   Whenever the context so requires the neuter gender includes
the masculine or feminine, and the singular number includes the plural, and vice
versa.

                            [Execution page follows]

                                       18

<PAGE>

            IN WITNESS WHEREOF, the Company has caused this Warrant to be
executed by its duly authorized as of the date first written above.

                                        EAGLE TEST SYSTEMS, INC.

                                        By: _____________________________
                                            Name:
                                            Title:

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