HACH CO
PRER14A, 1997-05-19
LABORATORY ANALYTICAL INSTRUMENTS
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<PAGE>
                                        

                            SCHEDULE 14A INFORMATION
                PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE
             SECURITIES EXCHANGE ACT OF 1934 (AMENDMENT NO. _______)


Filed by the Registrant                                 [X]
Filed by a Party other than the Registrant              [ ]

Check the appropriate box:

[X]  Preliminary Proxy Statement
[ ]  Confidential, for Use of the Commission only (as permitted by Rule
     14a-6(e)(2))
[ ]  Definitive Proxy Statement
[ ]  Definitive Additional Materials
[ ]  Soliciting Material Pursuant to Section 240.14a-11(c) or Section 240.14a-12

                         HACH COMPANY                    
       ------------------------------------------------------------------------
       (Name of Registrant as Specified In Its Charter)

       ------------------------------------------------------------------------
       (Name of Person(s) Filing Proxy Statement if other than the Registrant)

Payment of Filing Fee (Check the appropriate box):

[X]  No fee required.
[ ]  Fee computed on table below per Exchange Act Rules 14a-6(i)(4) and 0-11.

     (1)  Title of each class of securities to which transaction applies:

          ---------------------------------------------------------------------

     (2)  Aggregate number of securities to which transaction applies:

          ---------------------------------------------------------------------

     (3)  Per unit price or other underlying value of transaction computed
          pursuant to Exchange Act Rule 0-11 (Set forth the amount on which the
          filing fee is calculated and state how it was determined):

          ---------------------------------------------------------------------

     (4)  Proposed maximum aggregate value of transaction:

          ---------------------------------------------------------------------

[ ]  Fee paid previously with preliminary materials.

[ ]  Check box if any part of the fee is offset as provided by Exchange Act Rule
     0-11(a)(2) and identify the filing for which the offsetting fee was paid
     previously.  Identify the previous filing by registration statement number,
     or the Form or Schedule and the date of its filing.

     (1)  Amount Previously Paid:                                               
                                 ----------------------------------------------

     (2)  Form, Schedule or Registration Statement No.:                         
                                                       ------------------------

     (3)  Filing Party:                                                         
                       --------------------------------------------------------

     (4)  Date Filed:                                                           
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<PAGE>
                                     [LOGO]
 
Dear Fellow Stockholder:
 
   
    You are cordially invited to attend the special stockholders meeting of Hach
Company, a Delaware corporation (the "Company"), to be held at the Company's
principal offices on Wednesday, July 23, 1997 at 2:00 p.m., local time. At this
meeting you will be asked to approve an amendment to the Company's Restated
Certificate of Incorporation creating a new class of stock, designated as Class
A Common Stock, which would be nonvoting except under certain limited
circumstances. Upon such approval, the Company plans to distribute a stock
dividend of one share of Class A Common Stock for each share of Common Stock
outstanding on the stock dividend record date.
    
 
   
    You will find enclosed the Notice and Agenda of Special Meeting, the Proxy
Statement and the Proxy Card for the special meeting. Details of the proposed
amendment are set forth in the accompanying Proxy Statement, which you should
read carefully.
    
 
    THE BOARD OF DIRECTORS OF THE COMPANY HAS UNANIMOUSLY APPROVED THE PROPOSED
AMENDMENT, AND RECOMMENDS THAT ALL STOCKHOLDERS VOTE TO APPROVE IT.
 
   
    The creation of a capital structure with two classes of common stock is
designed to give the Company additional flexibility to issue shares for
acquisition or financing purposes, to preserve stability and in the long term to
increase liquidity, without diluting the voting power of its existing
stockholders.
    
 
    So that your shares may be represented in the action to be taken at the
special meeting of stockholders, I urge you to promptly complete, sign, date and
return the accompanying proxy card in the enclosed envelope.
 
                                          Very truly yours,
 
   
                                          Kathryn Hach-Darrow
                                          Chairman and Chief Executive Officer
    
<PAGE>
   
                                     [LOGO]
 
            NOTICE AND AGENDA OF THE SPECIAL MEETING OF STOCKHOLDERS
                      TO BE HELD WEDNESDAY, JULY 23, 1997
    
 
To the Stockholders of Hach Company:
 
   
    Notice is hereby given that the Special Meeting of Stockholders of Hach
Company, a Delaware corporation (the "Company"), will be held at its principal
corporate offices, 5600 Lindbergh Drive, Loveland, Colorado 80538, on Wednesday,
July 23, 1997, at 2:00 p.m. local time, for the following purposes:
    
 
   
    1.  To consider and act upon a proposal to amend Article Fourth of the
       Company's Restated Certificate of Incorporation to: (i) authorize a new
       class of common stock designated as Class A Common Stock, $1.00 par value
       which would be non-voting (except in certain limited circumstances); (ii)
       increase the number of authorized shares of capital stock from 25,000,000
       to 45,000,000 consisting of 25,000,000 shares of Common Stock and
       20,000,000 shares of Class A Common Stock; and (iii) establish the
       rights, powers and limitations of the Class A Common Stock.
    
 
    2.  To consider and transact such other business as may properly come before
       the meeting or any adjournment thereof.
 
   
    Only stockholders of record at the close of business on June 12, 1997 will
be entitled to notice of, and to vote at, the meeting. To ensure that your
shares will be represented, we urge you to vote, date, sign and mail the
enclosed Proxy Card in the envelope which is provided, whether or not you expect
to be present at the meeting. The prompt return of your Proxy Card will be
appreciated. It will also save the Company the expense of a reminder mailing.
    
 
    IT IS IMPORTANT TO YOU AND TO THE COMPANY THAT YOU VOTE YOUR SHARES BY
COMPLETING AND RETURNING THIS PROXY CARD. WE APPRECIATE YOUR COOPERATION AND WE
THANK YOU.
 
                                          By Order of the Board of Directors,
 
                                          ROBERT O. CASE, SECRETARY
 
   
Loveland, Colorado
June 16, 1997
    
 
                               I M P O R T A N T
 
   
    A Proxy Statement and Proxy Card are submitted with this Notice. All
stockholders are urged to read the Proxy Statement and to complete and mail the
Proxy Card promptly. The enclosed envelope for the return of the Proxy Card
requires no postage if mailed in the United States. A list of stockholders
entitled to vote at the Special Meeting will be available for inspection by any
stockholder for any purpose germane to the meeting during ordinary business
hours for a period of ten days prior to the meeting at the principal offices of
the Company, 5600 Lindbergh Drive, Loveland, Colorado 80538.
    
<PAGE>
                                  HACH COMPANY
 
   
                              5600 Lindbergh Drive
                            Loveland, Colorado 80538
    
 
                            ------------------------
 
                                PROXY STATEMENT
                    FOR THE SPECIAL MEETING OF STOCKHOLDERS
 
   
                      TO BE HELD WEDNESDAY, JULY 23, 1997
    
 
PROXY SOLICITATION
 
   
    This Proxy Statement is furnished to stockholders of Hach Company (the
"Company") on or about June 16, 1997, in connection with solicitation of proxies
on behalf of the Board of Directors to be voted at the Special Meeting of
Stockholders on Wednesday, July 23, 1997, at 2:00 p.m. local time, in the
Company's principal offices at 5600 Lindbergh Drive, Loveland, Colorado 80538,
and at any adjournment of such meeting. If the form of proxy which accompanies
this Proxy Statement is executed and returned, it may be revoked by the person
giving it at any time before the meeting by writing to the Secretary of the
Company, at its principal offices, by delivery of a later dated proxy or by
attending the Special Meeting and voting in person, in which case any prior
proxy given will automatically be revoked.
    
 
   
    Properly executed proxies received prior to the meeting will be voted at the
meeting. If a stockholder designates how the proxy is to be voted on the
Amendment (as defined below), the signed proxy will be voted in accordance with
such designation. If a stockholder fails to designate how his proxy should be
voted, the signed proxy will be voted in favor of the Amendment.
    
 
   
    The costs of this solicitation will be paid by the Company. Such costs
include preparation, printing and mailing of the Notice of Special Meeting and a
form of proxy and Proxy Statement. The officers and employees of the Company and
its subsidiaries, without additional compensation, may solicit proxies
personally or by telephone and telegram. Arrangements will be made with
brokerage houses and other custodians, nominees and fiduciaries for proxy
material to be sent to the principals, and the Company will reimburse such
persons for their expenses. The Company has also retained the firm of Morrow &
Company to assist in the solicitation of proxies at a cost of approximately
$7,500, plus reasonable out-of-pocket expenses.
    
 
VOTING AT THE SPECIAL MEETING
 
   
    Stockholders of record owning the Company's common stock, $1.00 par value
("Common Stock"), at the close of business on June 12, 1997, will be entitled to
vote at the Special Meeting. On that date,       shares of Common Stock were
outstanding. Each outstanding share of Common Stock entitles the holder to one
vote upon the matter presented at the Special Meeting. The presence of the
holders of a majority of the outstanding shares of Common Stock, represented in
person or by proxy, will constitute a quorum at the Special Meeting. Shares
voted as abstentions on this matter will be counted as shares that are present
and entitled to vote for purposes of determining the presence or absence of a
quorum at the
    
 
                                       1
<PAGE>
   
meeting and as unvoted, although present and entitled to vote, for purposes of
determining the approval of this matter as to which the stockholder has
abstained. Abstentions have the effect of votes against the matter. If a broker
submits a proxy that indicates the broker does not have discretionary authority
as to certain shares to vote on this matter, those shares will be counted as
shares that are present and entitled to vote for purposes of determining the
presence or absence of a quorum at the meeting, but will not be considered as
present and entitled to vote with respect to this matter. Since the vote of a
majority of the Outstanding Common Stock is required to authorize the Amendment,
broker non-votes will have the effect of a vote against this matter.
    
 
    While the Notice of Special Meeting calls for the transaction of such other
business as may properly come before the meeting, management has no knowledge of
any matters to be presented for action by the stockholders except as set forth
in this Proxy Statement. The enclosed proxy gives discretionary authority to the
person holding those proxies to vote in accordance with their best judgment as
to any other business.
 
                             AVAILABLE INFORMATION
 
    The Company is subject to the informational requirements of the Securities
Exchange Act of 1934, as amended, and in accordance therewith files reports,
proxy statements, and other information with the Securities and Exchange
Commission (the "Commission"). Such reports, proxy statements and other
information filed with the Commission can be inspected and copied at the public
reference facilities maintained by the Commission at Room 1024, 450 Fifth
Street, N.W., Washington, D.C. 20549, and at the Commission's Regional Offices
at Seven World Trade Center, 13th Floor, New York, New York 10048 and Citicorp
Center, 500 West Madison Street, Suite 1400, Chicago, Illinois 60661. Copies of
such material also can be obtained from the Public Reference Section of the
Commission, Washington, D.C. 20549 at prescribed rates. In addition, material
filed by the Company can be inspected at the offices of The NASDAQ Stock Market,
Reports Section, 1735 K Street, N.W., Washington, D.C. 20006.
 
                                       2
<PAGE>
                  STOCK OWNERSHIP OF CERTAIN BENEFICIAL OWNERS
 
   
    The table below sets forth, as of June 12, 1997, information to the best of
the Company's knowledge with respect to the persons who beneficially owned in
excess of five percent of the Company's Common Stock; the total number of shares
of the Company's Common Stock beneficially owned by each Director and named
executive officer; and the total number of shares of the Company's Common Stock
beneficially owned by the Directors and executive officers of the Company, as a
group.
    
 
   
<TABLE>
<CAPTION>
                                                                                                   APPROXIMATE
                                                                                  AMOUNT          PERCENTAGE OF
NAME OF BENEFICIAL OWNER                                                    BENEFICIALLY OWNED        CLASS
- --------------------------------------------------------------------------  ------------------  ------------------
<S>                                                                         <C>                 <C>
Kathryn Hach-Darrow (1)(2)................................................       [4,599,051]           [39.81%]
Lawter International, Inc.(3).............................................       [3,157,220]           [27.33%]
Hach Company Employee Stock...............................................         [692,489]            [5.99%]
  Ownership Plan and Trust(4).............................................
Bruce J. Hach (2)(5)(6)...................................................         [167,230]            [1.45%]
Gary R. Dreher (2)(5)(7)..................................................          [43,718]            *
Joseph V. Schwan (2)(5)(8)................................................          [25,399]            *
Linda O. Doty (2)(5)(9)...................................................          [16,505]            *
John N. McConnell (2)(5)(10)..............................................          [15,619]            *
Fred W. Wenninger (2)(5)(11)..............................................           [8,162]            *
Directors and executive officers as a group (15 Persons) (5)(12)..........       [5,085,266]           [44.02%]
</TABLE>
    
 
- ------------------------
 
*   Less than one percent (1%).
 
   
(1) Kathryn Hach-Darrow has been a Director of the Company since 1951 and is
    Chairman of the Board and Chief Executive Officer of the Company, a position
    she has held since 1988. The shares listed in the table above opposite
    Kathryn Hach-Darrow's name include 928,300 shares held in Mrs. Hach-Darrow's
    name. The shares listed above also include 1,869,743 shares held by Mrs.
    Hach-Darrow as trustee and beneficiary of the Kathryn C. Hach Marital Trust,
    95,176 shares held by Mrs. Hach-Darrow as the trustee and beneficiary of the
    Clifford C. Hach Generation Skipping Trust, and 73,635 shares held by the
    Clifford C. Hach Family Trust, all three of which Trusts were created under
    an agreement dated August 30, 1988, by Clifford C. Hach. Mrs. Hach-Darrow
    has the power to vote and dispose of the shares held in the Marital,
    Generation Skipping and Family Trusts. In addition, the shares listed above
    opposite Mrs. Hach-Darrow's name include 1,511,415 shares owned by C&K
    Enterprises, Ltd., as to which Mrs. Hach-Darrow and the Kathryn C. Hach
    Marital Trust have voting and investment powers, and 120,782 shares owned by
    the Hach Scientific Foundation, a charitable foundation. Mrs. Hach-Darrow is
    President and a co-trustee of the Foundation and shares voting and
    investment powers with respect to the shares held by the Foundation. The
    business address of Mrs. Hach-Darrow is 5600 Lindbergh Drive, Loveland,
    Colorado 80537.
    
 
   
(2) Excludes 128,567 shares owned by the Hach Company 401(k) Plan. The Company
    through its board of directors has the power to vote such shares. In
    addition, the co-trustees of the 401(k) Plan share investment power with
    respect to those shares. Also excludes shares of the Company's Employee
    Stock Ownership Plan (the "ESOP"), as to which the Company through its Board
    of Directors, and the ESOP's co-trustees, have investment power. The
    co-trustees of each of the 401(k) Plan and the ESOP are Randall A. Petersen,
    Gary R. Dreher and Loel J. Sirovy. The ESOP as of June 12, 1997 held a total
    of 692,489 shares, all of which were allocated to the accounts of plan
    participants. Shares accrued to the individual accounts of Bruce J. Hach and
    Gary R. Dreher are reflected in the table above and the amounts of the
    shares being held in said individual accounts are given in footnotes 6
    
 
                                       3
<PAGE>
    and 7 to the above table. See footnote 4 to the above table with reference
    to the power to vote ESOP shares.
 
(3) Based on information set forth in Amendment No. 7 to Schedule 13D filed by
    Lawter International, Inc. with the Commission on September 15, 1995. The
    business address for Lawter International, Inc. is 990 Skokie Boulevard,
    Northbrook, Illinois 60062.
 
   
(4) These shares are allocated to the accounts of the individual employees of
    Hach Company who are participants in the ESOP, and who have the power to
    vote the shares. The Trustees and the Company have investment power over the
    stock held in the Plan. The business address of the ESOP is 5600 Lindbergh
    Drive, Loveland, Colorado 80538.
    
 
   
(5) The shares reported in the above table include shares of Existing Common
    Stock which can be acquired within 60 days of June 12, 1997 through the
    exercise of options: Mr. Hach--14,000 shares; Mr. Dreher--24,000 shares; Mr.
    Schwan -8,162 shares; Ms. Doty--8,162 shares; Mr. McConnell-- 8,162 shares;
    and Mr. Wenninger--8,162 shares; and Directors and executive officers as a
    group-- 176,480 shares. Each individual's option shares are also included in
    the number of shares of the Company issued and outstanding for purposes of
    calculating the percentage ownership of each individual in accordance with
    the rules and regulations of the Securities Exchange Act of 1934, as
    amended. These persons also have options not exercisable within 60 days of
    June 12, 1997 by which they can acquire the following additional shares of
    Common Stock: Mr. Hach--16,000 shares; Mr. Dreher--16,000 shares; and
    Directors and executive officers as a group--139,501 shares. These shares
    are not included in the above table or in the percentage ownership
    calculations.
    
 
   
(6) Bruce J. Hach has been a Director of the Company since 1987 and is President
    and Chief Operating Officer of the Company, a position he has held since
    1988. The shares reported in the above table exclude 64,644 shares held by
    Robert O. Case and Bruce J. Hach as co-trustees of eight irrevocable trusts
    for the benefit of the grandchildren of Kathryn Hach-Darrow. Robert O. Case
    and Bruce J. Hach have shared investment and voting powers with respect to
    those shares. Three of the beneficiaries of the trusts are the children of
    Bruce J. Hach. Also excludes 217,950 shares held in separate shares in an
    irrevocable trust for the benefit of the grandchildren of Kathryn
    Hach-Darrow by Bank One--Loveland under an agreement dated June 30, 1975,
    between Kathryn Hach-Darrow and the late Clifford C. Hach as settlors, and
    The Northern Trust Company, as initial trustee. The Trust is being held for
    the benefit of the grandchildren of Kathryn Hach-Darrow and the late
    Clifford C. Hach, three of whom are the children of Bruce J. Hach. Also
    excludes 94,047 shares held by a partnership composed of the children of
    Kathryn Hach-Darrow and their spouses. Includes 5,335 shares held by the
    ESOP which are accrued to the account of Bruce J. Hach and which he has the
    right to direct the Plan trustee to vote.
    
 
   
(7) Gary R. Dreher has been a Director of the Company since 1994 and is Vice
    President and Chief Financial Officer of the Company, a position he has held
    since 1994. He has served as an officer of the Company in other capacities
    since 1990. The shares reported in the above table includes 3,684 shares
    held by the ESOP which are accrued to the account of Mr. Dreher and which he
    has the right to direct the Plan trustee to vote. Excludes an additional
    688,805 shares owned by the ESOP, for which Mr. Dreher as a co-trustee of
    the ESOP shares investment power.
    
 
   
(8) Joseph V. Schwan has been a Director of the Company since 1987. He is
    Executive Vice President and Chief Operating Officer of The Standard
    Register Company (a publicly-held manufacturer and distributor of business
    forms).
    
 
                                       4
<PAGE>
   
(9) Linda O. Doty has been a Director of the Company since 1991. She is a
    Certified Public Accountant and a partner in Doty & Associates, Certified
    Public Accountants.
    
 
   
(10) John N. Mc Connell has been a Director of the Company since 1990. He is
    Chairman and President of Labconco Corporation (a laboratory equipment
    manufacturer).
    
 
   
(11) Fred W. Wenninger has been a Director of the Company since 1990. He is
    President and Chief Executive Officer of Key Tronics Corporation (a
    publicly-held manufacturer of computer keyboards).
    
 
   
(12) Includes the shares listed in the table above opposite Kathryn
    Hach-Darrow's name. Excludes (i) 124,245 shares held by the Company's 401(k)
    Plan for the individual accounts of employees, other than executive officers
    and directors of the Company, (ii) 664,380 shares held by the Company's
    ESOP, which are allocated to the individual accounts of employees other than
    executive officers or directors of the Company, (iii) 282,594 shares
    referred to in footnote 6 to the table above, and (iv) 94,047 shares held by
    a partnership composed of the children of Kathryn Hach-Darrow and the late
    Clifford C. Hach and their spouses, as to which Bruce J. Hach, the President
    and a Director of the Company, is a partner. If all the shares referred to
    in the preceding sentence were included, the shares beneficially owned by
    officers and directors as a group would be 6,250,532 and the percent of the
    class would be 54.11%.
    
 
   
                        PROPOSAL TO AMEND THE COMPANY'S
                     RESTATED CERTIFICATE OF INCORPORATION
          SUMMARY DESCRIPTION OF THE AMENDMENT AND THE STOCK DIVIDEND
    
 
   
    At the Special Meeting, the stockholders of the Company will be asked to
consider and vote upon an amendment in the form attached hereto as Exhibit A
(the "Amendment") to Article Fourth of the Company's Restated Certificate of
Incorporation to: (i) authorize a new class of common stock designated as Class
A Common Stock, $1.00 par value ("Class A Common Stock"), which would be
non-voting (except in certain limited circumstances); (ii) increase the number
of authorized shares of capital stock of the Company from 25,000,000 to
45,000,000, consisting of 25,000,000 shares of Common Stock and 20,000,000
shares of Class A Common Stock; and (iii) establish the rights, powers and
limitations of the Class A Common Stock. The Common Stock and Class A Common
Stock sometimes are referred to collectively in this Proxy Statement as the
"Common Stocks." As of June 12, 1997,       shares of the Common Stock were
outstanding, leaving       shares available for issuance.
    
 
   
    If the Amendment is approved by the stockholders, the Board of Directors of
the Company intends to prepare and file a Certificate of Amendment to the
Company's Restated Certificate of Incorporation in accordance with the
Amendment, which will become effective (the "Effective Time") immediately upon
acceptance of filing by the Secretary of State of Delaware.
    
 
   
    Although the Board of Directors presently intends to file the Amendment
promptly after it is approved by the stockholders, as permitted under Delaware
law, the Board of Directors may decline to file the Amendment even if the
Amendment is approved by the stockholders, if the Board of Directors determines
that such action would be in the best interests of the Company. The Company
currently knows of no reason why the Amendment would not be filed if adopted by
the stockholders. The Restated Certificate of Incorporation after the Effective
Time of the Amendment is referred to herein as the "Amended Restated
Certificate."
    
 
                                       5
<PAGE>
   
    The Board of Directors, subject to the approval and filing of the Amendment,
plans to authorize and distribute as a dividend, to be made shortly after the
Effective Time, of one share of Class A Common Stock for each share of Common
Stock outstanding on the record date for such dividend (the "Stock Dividend").
If the Stock Dividend is authorized, the record date for the Stock Dividend (the
"Stock Dividend Record Date") will be set by the Board of Directors promptly
following the Effective Time. The date of distribution of the Common Stock under
the Stock Dividend, if authorized, is expected promptly after the Stock Dividend
Record Date. Stockholder approval of the Stock Dividend is not required by
Delaware law and is not being solicited by this Proxy Statement.
    
 
   
    Subject to the approval and filing of the Amendment and authorization of the
Stock Dividend, as soon as practicable after the Stock Dividend Record Date,
Harris Trust and Savings Bank, the Company's transfer agent and registrar, will
issue certificates representing the number of shares of Class A Common Stock
each stockholder is entitled to receive as a consequence of the Stock Dividend.
    
 
   
    The Amendment makes no change to the terms of the Common Stock except to the
extent voting rights with regard to those shares would be affected by the Class
A Protection Provision described below. See "Description of the Class A Common
Stock and Common Stock--Class A Protection." As more fully described below, the
new shares of Class A Common Stock created by the Amendment will have certain
special characteristics. In particular, the holders of Class A Common Stock will
not be entitled to vote on any matters except as otherwise required by law and
in certain other limited circumstances. See "Description of the Class A Common
Stock and Common Stock--Additional Voting Rights of the Class A Common Stock."
    
 
   
    If authorized and distributed, the Stock Dividend will cause no change in
the relative voting power or equity of any stockholder of the Company, including
members of the Hach family, because the Stock Dividend will be distributed to
each stockholder in proportion to the number of shares of Common Stock owned on
the Stock Dividend Record Date.
    
 
   
    The Amendment has been unanimously approved by the Company's Board of
Directors, which includes a majority of directors who are neither a member of
the Hach family nor an officer or employee of the Company. The Board of
Directors believes that the Amendment and, if authorized and distributed, the
Stock Dividend are in the best interests of the Company and its stockholders and
recommends a vote FOR the approval and adoption of the Amendment. Each of the
members of the Company's Board of Directors, including Kathryn Hach-Darrow and
Bruce Hach, have indicated that they intend to vote all shares of Common Stock
controlled by them, representing   % of the outstanding Common Stock as of the
record date, for the approval and adoption of the Amendment.
    
 
   
                      BACKGROUND OF THE PROPOSED AMENDMENT
    
 
   
    THE HACH FAMILY.  The Company was founded in 1947 by Kathryn Hach-Darrow and
her late husband, Clifford C. Hach, and the Hach family has owned a very
substantial interest in the Company since that time. As of June 12, 1997,
members of the Hach family beneficially owned an aggregate of       shares of
the Common Stock, and together control approximately    % of the voting power of
the Company. See "Stock Ownership of Certain Beneficial Owners." For purposes of
this Proxy Statement, the "Hach family" refers to Kathryn Hach-Darrow, Bruce J.
Hach, C&K Enterprises, Ltd., a corporation owned by Mrs. Hach-Darrow and Bruce
J. Hach, Paul Hach and Mary Hach Gibbs, her three children, and the charitable
foundation and trusts identified in footnote 1 to the table included above under
"Stock Ownership of Certain Beneficial Owners." The very substantial stock
ownership of the Hach family gives
    
 
                                       6
<PAGE>
   
the Hach family near voting control of the Company with respect to matters which
require the approval of a majority of the Company's outstanding voting
securities.
    
 
   
    THE COMPANY RELATIONSHIP WITH LAWTER INTERNATIONAL, INC.  Lawter
International, Inc. ("Lawter") currently owns approximately [27.33%] of the
outstanding Common Stock of the Company. The relationship between Lawter and the
Company has covered almost three decades, beginning with the Company's initial
public offering in 1968 when Lawter's founder and chief executive officer,
Daniel J. Terra, first became acquainted with Clifford C. Hach and Kathryn
Hach-Darrow. Between 1968 and 1984, Mr. Terra acquired shares of the Company in
open market and private transactions. In January 1985, Lawter acquired Mr.
Terra's interest in the Company, and at the same time purchased shares of the
Company's stock from a third party, thereby substantially establishing its
current ownership position.
    
 
   
    Over the years, Mr. Terra and Lawter have made a number of formal and
informal attempts to acquire control of the Company through proposed agreements
with the Company or the Hach family. These attempts have included unsolicited
offers to Mrs. Hach-Darrow, Mr. Clifford Hach and the Company's Board of
Directors, a proposed tender offer (to which Lawter sought the Company's
agreement), and proposed mergers and other strategic combinations (both directly
and with Lawter-sponsored third parties).
    
 
   
    With the exception of a merger agreement signed by the Company and Lawter in
August 1993, which was abandoned by the agreement of the parties prior to its
consummation, the response of the Company, and of the Hach family, to Lawter's
overtures has been a consistent "no." This position reflects: (i) the belief of
the Company's Board of Directors and the Hach family that the business and
strategic goals of Lawter are not compatible with the Company's objective of
enhancing stockholder value through its long-term strategy of independent growth
as a leader in the development, manufacture and sale of systems for water
analysis; and (ii) the desire of the Hach family at the present time not to sell
its interest in the Company. Given this position, the Board of Directors of the
Company and the Hach family have been reluctant to take actions that would
substantially increase the Company's outstanding Common Stock (through public or
private equity offerings or by issuing equity as consideration in acquisition
transactions), believing Lawter's persistent attempts to acquire control of the
Company would be enhanced by the dilution of the Hach family shareholdings which
would occur as a result of such issuances of Common Stock or that Lawter might
increase its percentage ownership of the Company through purchases of additional
shares of Common Stock in the public market.
    
 
   
    The Company and Lawter have also discussed Lawter exiting its investment in
the Company through the Company's purchase of the 3,157,220 shares of the
Company's Common Stock held by Lawter (the "Lawter Block"). Following the death
of Mr. Terra in June, 1996, the Company approached Lawter about its willingness
to consider the sale of the Lawter Block. Beginning in late August 1996, the
Company and Lawter entered into discussions and negotiations for the purchase of
the Lawter Block. The Board of Directors of the Company at its annual meeting on
August 27, 1996 authorized management to make a proposal to Lawter with respect
to the purchase of the Lawter Block, and on August 28, 1996, the Company
delivered a written proposal to Lawter which included a proposed price of $19.00
per share for the Lawter Block. That proposal was not accepted by Lawter, which
indicated that the proposed price was substantially lower than the price Lawter
wished to obtain.
    
 
    A special meeting of the Board of Directors of the Company was held on
November 22, 1996, with all directors other than Mr. Joseph Schwan present. Mrs.
Hach-Darrow reported that the Company's proposal, which had included a $19.00
per share proposed purchase price for the Lawter Block, had been
 
                                       7
<PAGE>
rejected by Lawter. After reviewing financial information about the Company and
Lawter and discussing the potential benefits to the Company of acquiring the
Lawter Block, the Board of Directors authorized senior management to make
another proposal to Lawter which would increase the proposed purchase price to
be paid by the Company for the Lawter Block.
 
   
    On December 2, 1996, senior management of the Company and senior management
of Lawter met at Lawter's headquarters in Northbrook, Illinois. At that meeting,
the Company proposed to increase the per share purchase price for the purchase
of the Lawter Block to $23.75 per share. While the Lawter representatives told
the Company they would present the revised offer to the Lawter Board of
Directors at its scheduled December 20, 1996 meeting, Lawter asked the Company
to consider a purchase price of $25 per share for the Lawter Block.
    
 
   
    Following the December 2, 1996 meeting, representatives of Lawter and the
Company continued discussions relating to the Company's proposal to purchase the
Lawter Block. During this period, the Company determined to obtain additional
financial advice with respect to its proposed purchase of the Lawter Block.
Management of the Company advised Lawter telephonically on December 17, 1996
that the Company was suspending further negotiations relating to any purchase of
the Lawter Block until after year end. The Company further advised Lawter that
the Company intended to retain a nationally-recognized investment banking firm
and that it would not be giving further consideration to a purchase of the
Lawter Block until it had received the advice of such a financial advisor. The
Company confirmed this telephone conversation, and formally withdrew all
proposals to purchase the Lawter Block, by a letter delivered to Lawter on
December 20, 1996.
    
 
   
    RETENTION OF LAZARD FRERES.  On December 20, 1996 the Company retained
Lazard Freres & Co. L.L.C. ("Lazard Freres") as a financial advisor to advise
the Company generally with respect to strategic alternatives for enhancing
stockholder value and particularly with respect to addressing the Company's
relationship with Lawter. The Company and Lazard Freres have entered into a
letter agreement dated December 20, 1996 (the "Lazard Freres Engagement Letter")
relating to the services to be provided by Lazard Freres. Pursuant to the Lazard
Freres Engagement Letter, the Company has paid Lazard Freres a fee of $250,000
to act as the Company's financial advisor through December 1997. The Company has
also agreed to pay Lazard Freres an additional $250,000 if the Company
consummates a transaction involving the purchase of the Lawter Block during the
term of the engagement. The Company will also reimburse Lazard Freres for the
fees and disbursements of Lazard Freres' counsel and Lazard Freres' other
out-of-pocket expenses and will indemnify Lazard Freres against certain
liabilities, including liabilities under the federal securities laws. Lazard
Freres had not provided any services to the Company prior to being engaged as
the Company's financial advisor on December 20, 1996.
    
 
    In connection with its engagement, among other things, Lazard Freres spoke
with the Company's management and certain employees, and reviewed certain
financial and other information supplied by the Company, as well as market
information.
 
    On January 13, 1997, Lazard Freres met with senior management of the Company
to review Lazard Freres' preliminary analysis of the Company's strategic
alternatives, which included the possible purchase of the Lawter Block and
implementation of a dual class capital structure.
 
   
    Following the January 13, 1997 meeting, senior management of the Company
directed counsel for the Company to prepare for senior management's review a
proposal which would implement a dual class structure. The draft proposal as
contemplated by senior management would (i) create a new class of nonvoting
common stock to be initially distributed pro-rata to existing stockholders, (ii)
prevent persons
    
 
                                       8
<PAGE>
   
from acquiring substantial voting positions without acquiring corresponding
non-voting positions, and (iii) provide the Board of Directors with the ability
to pay higher dividends to holders of non-voting common stock in order to
minimize any disparity in the market prices of the voting and non-voting shares.
Prior to the February 3, 1997 Board of Directors meeting, counsel for the
Company delivered a draft proposal to senior management for their review.
    
 
   
    CONSIDERATION OF THE AMENDMENT BY THE BOARD OF DIRECTORS AND THEIR
ADVISORS.  At a special meeting of the Board of Directors held on February 3,
1997, all members of the Board of Directors, representatives of the Company's
financial advisors and counsel for the Company met to review in detail the
Company's strategic alternatives. The review included a discussion of the
Company's market valuation and liquidity, industry peer group financial and
stock performance, and the Company's growth objectives and its capital
structure. The review also included a discussion of general strategic
alternatives available to the Company, including: the possible purchase of the
Lawter Block; the implementation of a dual class capital structure; an
extraordinary cash dividend to stockholders; a significant repurchase offer made
equally available to all stockholders; a negotiated sale of the Company; and
taking the Company "private" (i.e., the repurchase of the Common Stock of all
stockholders other than the Hach family and other Company affiliates).
    
 
    With respect to a purchase of the Lawter Block, the Board of Directors
concluded, based on the review and discussions with its financial advisors and
counsel, that a purchase from Lawter at a substantial premium price would place
a significant financial burden on the Company, might limit the Company's ability
to fund future growth by acquisition or otherwise, and might result in a
negative reaction from the Company's stockholders and the market. The Board of
Directors decided, based on these conclusions and notwithstanding the benefits
the Company would obtain by acquiring the Lawter Block, that a purchase of the
Lawter Block at a significant premium price at this time would not be in the
best interests of the Company or its stockholders. However, the Board of
Directors also noted that, while any negotiated purchase of the Lawter Block
would require a substantial financial commitment by the Company, the purchase of
the Lawter Block at or near a market price would have a less significant effect
on the continuing financial condition of the Company, allow the Company future
financing flexibility and as a result most likely be viewed positively by the
Company's stockholders and the market. As a result of these discussions, the
Board of Directors concluded that representatives of Lazard Freres should
contact Lawter to communicate the position of the Board of Directors that the
Company remained interested in pursuing the purchase of the Lawter Block
provided such purchase could be made at or near the market price.
 
   
    The meeting then turned to dual class capital structures, including a
discussion of the impact of similar proposals on aggregate market value of
outstanding common equity of companies with dual classes of common equity; the
potential market price differential between voting and nonvoting shares; the
potential impact on the Company's market liquidity; the reaction of
institutional investors to nonvoting stock structures; the impact on the
Company's ability to raise capital; and the market impact of various features of
the nonvoting shares. Counsel for the Company reviewed with the Board of
Directors the provisions of the proposed amendment previously reviewed and
approved by senior management and its effects on the current capital structure
of the Company. Counsel then outlined for the Board of Directors the legal
aspects of a dual class capital structure, The NASDAQ Stock Market rules
regarding the listing of both the voting and nonvoting shares, and the fiduciary
responsibilities of the Board of Directors with respect to considering and
implementing a dual class proposal. In connection with its review of the dual
class capital structure alternative, the Board of Directors considered its
financial advisor's analysis of twenty-nine New York Stock Exchange and NASDAQ
listed companies that have both voting and non-voting shares that trade publicly
which the financial advisor considered to be a representative group of such
companies. The
    
 
                                       9
<PAGE>
   
analysis addressed the following issues: (i) voting rights of each class; (ii)
relative dividend yields; (iii) relative valuation; (iv) profile of controlling
shareholders; and (v) share performance over different time periods. Lazard
Freres considered the impact that similar capital structures in other public
companies may have had on total market value of outstanding common equity,
potential market-price differentials between voting and nonvoting shares,
potential impact on liquidity, reaction of institutional investors to nonvoting
structures and the ability to raise capital through the issuance of nonvoting
common stock. Lazard Freres gave its view that the adoption of a dual class
capital structure does not appear to have a material adverse effect upon market
liquidity or the ability of public companies to raise capital through an
offering of either classes of shares. Further, the information supported the
conclusion that the market does not appear to penalize, other things being
equal, the price of non-voting stocks based on the lack of voting rights. The
Board also reviewed additional information on the eighteen of the aforementioned
companies that subsequent to their initial public offering implemented a dual
class structure and the impact on market value of such implementation. This
information supported the conclusion that there does not appear to be a
significant effect, positive or negative, on most companies' stock price as a
result of the announcement and implementation of a dual class capital structure
relative to the market in general. Lazard Freres cautioned the Board of
Directors, however, that since the circumstances surrounding each company's
situation is unique no assurance can be given as to the market's reaction to a
dual class capital structure for a particular company, particularly one whose
stock is as illiquid as the Company's.
    
 
   
    The Board of Directors then reviewed and discussed the specific terms of a
proposal to implement a dual class structure presented by counsel for the
Company, as well as the likely benefits and possible disadvantages of the
proposal. As originally proposed, the dual class structure was to be implemented
by way of an amendment to the Company's Restated Certificate which would effect
a recapitalization of the Company by creating two classes of common stock, one
voting and one non-voting (except in certain limited circumstances), and by
changing each share of the outstanding Common Stock into one-half share of new
voting common stock and one-half share of new non-voting common stock (the
"Recapitalization Proposal"). The Board of Directors noted that a dual class
capital structure would not preclude the Company from pursuing other strategic
alternatives in the future, including a purchase of the Lawter Block. Based on
the presentation of management and the Company's advisors, the Board of
Directors acknowledged that the Recapitalization Proposal was worthy of further
consideration, directed management and counsel to finalize a Recapitalization
Proposal for the Board of Directors' consideration and instructed management and
counsel to submit the Recapitalization Proposal to The NASDAQ Stock Market for
its review in advance of any final approval by the Board of Directors.
    
 
   
    The Board also discussed with its advisors other strategic alternatives
available to the Company, but determined not to pursue them at the present time.
The February 3, 1997 special meeting was adjourned without further action by
Board of Directors.
    
 
   
    The Board of Directors met again on March 3, 1997 in a special meeting with
all members present. Also present were representatives of the Company's
financial advisor and counsel. Prior to the meeting counsel to the Company
delivered to all directors a draft of the Recapitalization Proposal and a
written summary of the terms and conditions of the Recapitalization Proposal and
its effects on the current capital structure of the Company.
    
 
    The representatives of Lazard Freres reported to the Board of Directors that
they met with Mr. John O'Mahoney, the Chairman and Chief Executive Officer of
Lawter, on February 13, 1997 and informed him that, while the Company remained
interested in purchasing the Lawter Block, such purchase could at this
 
                                       10
<PAGE>
time only be made at or near a market price. Lazard Freres indicated Lawter's
lack of interest in a sale that would not include a significant premium to
market.
 
   
    The Board of Directors then considered the Recapitalization Proposal as a
method to implement a dual class stock structure for the Company. The Board of
Directors was informed by counsel for the Company that a representative of The
NASDAQ Stock Market had advised the Company that the issuance of nonvoting
common stock pursuant to the Recapitalization Proposal would be permitted under
the rules and regulations of The NASDAQ Stock Market.
    
 
   
    The Board of Directors discussed the Recapitalization Proposal in detail,
including, without limitation, reviewing substantially those same matters more
fully described below under "Reasons for the Amendment; Recommendation of the
Board of Directors." Following these discussions all members of the Board of
Directors present at the meeting, including the directors who are neither
members of the Hach family nor an officer or employee of the Company
(representing a majority of the full Board of Directors), voted to approve the
Recapitalization Proposal and to recommend it to the Company's stockholders.
    
 
   
    The Board of Directors then called a special meeting of stockholders for
June 19, 1997 to consider the approval of Recapitalization Proposal, set a
record date of April 25, 1997 for the purpose of determining stockholders who
can vote at such special meeting and authorized the Company to file a proxy
statement with the Securities and Exchange Commission (the "Commission"),
relating to such special meeting.
    
 
   
    Following the Company's filing of its preliminary proxy materials on April
8, 1997 with the Commission, the Commission staff contacted counsel for the
Company with respect to the statement in the preliminary proxy materials that
only a majority vote of stockholders was required to adopt the Recapitalization
Proposal. The Commission staff raised the issue of whether the change of the
Company's Common Stock into new voting and non-voting common stock as a result
of the Recapitalization Proposal could be properly characterized as an issuance
of more than 10% of the outstanding voting securities of the Company to persons,
like Mrs. Hach-Darrow and Lawter, who own in excess of 5% of the Company's
voting securities, in exchange for securities, cash or other property. If the
Recapitalization Amendment were so characterized, Article Ninth of the Company's
Restated Certificate would require the affirmative vote of 80% of the holders of
the Company's Common Stock, rather than the majority vote described in the
preliminary proxy materials, in order to authorize such an issuance in
connection with the Recapitalization Proposal. After Company counsel's
conversation with the Commission, Lawter provided the Company with a copy of a
letter Lawter had earlier sent to the Commission with respect to the Company's
preliminary proxy materials, objecting in general to the Company's proposal to
implement a dual class structure and in particular to certain of the disclosures
contained in the preliminary proxy materials ("Lawter Comment Letter"). One of
the objections stated in the Lawter Comment Letter raised the same issue
communicated to the Company by the Commission, namely that the eighty percent
standard of Article Ninth was applicable to the vote required for the
Recapitalization Proposal as structured.
    
 
   
    At the Board of Directors' regularly scheduled year-end meeting on April 28,
1997, the Board and the Company discussed the status of the Recapitalization
Proposal, the Commission's comments with respect to the Company's filed
preliminary proxy materials, and the Lawter Comment Letter. The Company's legal
advisors advised the Board of Directors that, notwithstanding their belief that
the eighty percent standard of Article Ninth would not apply to the vote
required to authorize the Recapitalization Proposal, the Company's position
would be strengthened if the dual class structure previously discussed and
approved by the Board of Directors were implemented by an alternative method. In
addition, management stated the view that it might be desirable in promoting
liquidity to have outstanding after implementation of the dual
    
 
                                       11
<PAGE>
   
class structure as many shares of each class of common stock as there presently
are shares of Common Stock outstanding. After further discussion, the Board of
Directors concurred with the position of the Company's legal advisors and
management, and authorized the Company's legal advisors to prepare a revised
proposal which would implement a dual class structure by means of (i) an
amendment to the Company's Restated Certificate which would create a new class
of common stock which would be nonvoting (except in certain limited
circumstances) and (ii) a subsequent stock dividend of one share of the new
class of common stock for each share of Common Stock outstanding.
    
 
   
    On May 19, 1997, the Board of Directors again met telephonically with its
legal and financial advisors with respect to the Amendment and the Stock
Dividend. The Board of Directors discussed the Amendment and Stock Dividend in
detail, including, without limitation, reviewing matters generally described
below under "Reasons for the Amendment; Recommendation of the Board of
Directors."
    
 
   
    Following these discussions all members of the Board of Directors present at
the meeting, including the directors who are neither members of the Hach family
nor an officer or employee of the Company (representing a majority of the full
Board of Directors), voted to approve the Amendment and recommend it to the
Company's stockholders and, upon authorization of the Amendment by the Company's
stockholders and the determination by the Board to file the Amendment, to
consider authorizing and distributing the Stock Dividend. The Board of Directors
then determined to reschedule the special meeting of stockholders to consider
the approval of the Amendment until Wednesday, July 23, 1997, to set a new
record date of June 12, 1997 for the purpose of determining stockholders who can
vote on the authorization of the Amendment at such special meeting, and
authorized the Company to file revised preliminary proxy materials with the
Commission with respect to the Amendment to be presented to the Company's
stockholders at such rescheduled special meeting.
    
 
   
                           REASONS FOR THE AMENDMENT;
                    RECOMMENDATION OF THE BOARD OF DIRECTORS
    
 
   
    The Board of Directors of the Company believes, after careful consideration
of the potential advantages and disadvantages of the Amendment, that the
Amendment is in the best interest of the Company and its stockholders. The
material advantages and disadvantages of the Amendment considered by the Board
of Directors are set forth herein. The Board of Directors believes that a
capital structure which has two classes of common stock offers a number of
potential benefits to the Company and its stockholders, which are described
below. THEREFORE, THE BOARD OF DIRECTORS RECOMMENDS THAT YOU VOTE "FOR" THE
RESOLUTION AUTHORIZING THE AMENDMENT.
    
 
   
    FINANCING AND ACQUISITION FLEXIBILITY.  The Board of Directors believes that
the management of the Company by members of the Hach family has contributed
substantially to the growth and success of the Company and that maintaining the
relative voting power of the Hach family is in the best interests of the Company
and its stockholders. Because any sales of voting stock by the Company would
reduce the Hach family's voting power, and might lead to an acquisition of
control by Lawter, the Board of Directors' goal of preserving that voting power
has limited the Company's ability to sell or issue stock for financings,
acquisitions or other purposes. In addition, the Board of Directors is aware
that the Hach family desires at the present time to retain control of the
Company and therefore would probably be opposed to the sale or issuance of
significant amounts of voting stock by the Company.
    
 
                                       12
<PAGE>
   
    Implementation of the Amendment would provide the Company with increased
flexibility in the future to issue common equity in connection with acquisitions
and to raise equity capital or to issue convertible debt as a means to finance
future growth without diluting the voting power of the Company's existing
stockholders, including the Hach family. The Class A Common Stock may also be
used, rather than voting Common Stock, for the Company's stock benefit plans.
The Company has no present plans to issue additional equity or convertible
securities in any acquisition or financing arrangement, although the Company
continues to evaluate possible acquisition candidates.
    
 
   
    STOCKHOLDER FLEXIBILITY AND LIQUIDITY.  Once the Amendment is effective and
the Stock Dividend is distributed, stockholders who desire to maintain their
voting positions would be able to do so even if they decide to sell or otherwise
dispose of shares of Class A Common Stock (subject to the Class A protection
provisions discussed below). The Amendment and Stock Dividend, if it is
distributed, thus would give all stockholders, including members of the Hach
family and Lawter, increased flexibility to dispose of a portion of their equity
interest in the Company for estate planning or other purposes without affecting
their relative voting power. In addition, because stockholders who are
interested in maintaining their voting interest in the Company may be more
willing to sell shares of the Company if such sale does not result in a decrease
in their relative voting power, the Amendment may result in increased trading of
equity securities of the Company, thereby increasing liquidity. It is
anticipated that the voting Common Stock will continue to be listed, and
nonvoting Class A Common Stock will be listed, on The NASDAQ Stock Market. The
Company is unaware of any current plans or arrangements on the part of the
members of the Hach family to sell their Common Stock.
    
 
   
    CONTINUITY.  The adoption of the Amendment would enable the Company to issue
Class A Common Stock for financing, acquisition and other purposes without
immediate dilution of the voting power of the Company's existing stockholders,
although their percentage equity interests would be diluted. The adoption of the
Amendment and the Stock Dividend should reduce the risk of disruption in the
continuity of the Company's long-term plans and objectives that could otherwise
result if the members of the Hach family choose to sell a significant block of
Common Stock for diversification, for estate planning purposes or for other
reasons. Implementation of the proposal would allow members of the Hach family
to continue to exercise control over a substantial portion of the Company's
voting power even if members of the Hach family choose to reduce their total
equity position significantly, and allow members of the Hach family additional
estate planning flexibility to determine the succession of voting control
through gifts or bequests of Common Stock. Therefore, the Amendment and, if
authorized and distributed, the Stock Dividend should reduce the risk that the
Company could, at some future date, be compelled to consider a sale of the
Company in an environment that could be dictated to the Company and the Board of
Directors by the financial circumstances of the members of the Hach family or by
third parties who may be anticipating or speculating about such circumstances.
    
 
   
    KEY EMPLOYEES.  The Amendment and, if authorized and distributed, the Stock
Dividend should allow all employees of the Company to continue to concentrate on
their employment responsibilities without undue concern that the future of the
Company could be affected by real or perceived succession issues or by an
unsolicited takeover attempt that might otherwise be triggered by significant
sales of shares of the Company by members of the Hach family in the future. By
reducing these uncertainties, the Amendment and, if authorized and distributed,
the Stock Dividend may enhance the ability of the Company to attract and retain
highly qualified key employees. In addition, the Company's ability to issue
Class A Common Stock should increase the Company's flexibility in structuring
compensation plans and arrangements so
    
 
                                       13
<PAGE>
that employees may continue to participate in the growth of the Company without
diluting the voting power of existing stockholders.
 
   
    BUSINESS RELATIONSHIPS.  Implementation of the Amendment and the
distribution of the Stock Dividend may enhance the existing and potential
business relationships of the Company with suppliers, customers, and other
parties who may become concerned about changes in control of the Company in the
event the Hach family holdings are diluted.
    
 
   
                CERTAIN POTENTIAL DISADVANTAGES OF THE AMENDMENT
    
 
   
    While the Board of Directors has determined that implementation of the
Amendment and the distribution of the Stock Dividend is in the best interests of
the Company and its stockholders, the Board of Directors recognizes that the
implementation of the Amendment and the distribution of the Stock Dividend may
also be considered to have certain disadvantages, including the following and
those set forth under "Certain Effects of the Amendment."
    
 
   
    CHANGE OF CONTROL IMPACT.  The Hach family currently owns a significant
portion of the Common Stock. Historically, the ownership position of the Hach
family has prevented Lawter and other third parties from acquiring control of
the Company. Practically speaking, no attempt to obtain control of the Company
is likely to succeed without the consent of the Hach family. Currently, however,
the members of the Hach family can reduce their equity position in the Company
only by diluting their ownership of voting stock and increasing the possibility
that a third party could gain control of the Company over the objections of the
Hach family. Once effective, the Amendment and the Stock Dividend will allow
members of the Hach family to continue to exercise voting control even if some
or all of them choose to reduce their holdings of shares of Class A Common
Stock. As a result, implementation of the Amendment and the distribution of the
Stock Dividend is likely to limit the future circumstances in which a sale or
transfer of equity by the Hach family could lead to a merger proposal or tender
offer that is not acceptable to the Hach family or a proxy contest for the
removal of incumbent directors, whether made by Lawter or some other person.
Consequently, the Amendment and Stock Dividend, if distributed, might reduce the
possibility that stockholders of the Company may sell their shares at a premium
over prevailing market prices and make it more difficult to replace the current
Board of Directors and management of the Company.
    
 
   
    STATE STATUTES.  Some state securities statutes contain provisions which,
due to the existence of the nonvoting Class A Common Stock, may restrict an
offering of equity securities by the Company or the secondary trading of its
equity securities in those states. However, assuming, as expected, that the
Common Stock will continue to be listed on, and the Class A Common Stock will be
listed on The NASDAQ Stock Market National Market System, the Securities Act of
1933 will provide an exemption from such state regulations for the offering and
secondary trading of the Company's equity securities.
    
 
   
    ACQUISITION ACCOUNTING.  The Class A Common Stock may not be used to effect
a business combination intended to be accounted for using the "pooling of
interests" method. In order for such method to be used, the Company would be
required to issue shares of Common Stock as the consideration for the
combination. As a result, the Company's flexibility with respect to structuring
business combinations using Class A Common Stock could be restricted.
    
 
   
    BROKERAGE COSTS; SECURITY FOR CREDIT.  As is typical in connection with any
stock dividend, brokerage charges and stock transfer taxes, if any, may be
somewhat higher with respect to purchases and sales of
    
 
                                       14
<PAGE>
   
Common Stock and Class A Common Stock after the Stock Dividend, if distributed,
assuming transactions of the same dollar amount, because of the increased number
of shares involved.
    
 
   
    The Company does not expect that the adoption of the Amendment and the Stock
Dividend, if distributed, will affect the ability of holders to use the Common
Stock or Class A Common Stock as security for the extension of credit by
financial institutions, securities brokers, or dealers.
    
 
   
    INVESTMENT BY INSTITUTIONS.  Implementation of the Amendment and the
distribution of the Stock Dividend may affect the decision of certain
institutional investors that would otherwise consider investing in or retaining
the Common Stock. The holding of nonvoting shares may not be permitted by the
investment policies of certain institutional investors or may be less attractive
to managers of certain institutional investors. The Company is not aware of the
effect, if any, the implementation of the Amendment will have on the continued
holdings of those institutional investors who currently own Common Stock.
    
 
   
                  DESCRIPTION OF THE CLASS A COMMON STOCK AND
                                THE COMMON STOCK
    
 
   
    As indicated above, the Amendment will create the Class A Common Stock as a
new class of common stock which will be nonvoting except under the limited
circumstances described below. The rights, powers and limitations of the Class A
Common Stock and the Common Stock are set forth in full in the proposed Article
Fourth of the Company's Restated Certificate of Incorporation. The full text of
Article Fourth as proposed to be amended and restated is set forth as Exhibit A
to this Proxy Statement and is incorporated herein by reference. The following
summary should be read in conjunction with, and is qualified in its entirety by
reference to, such Exhibit A.
    
 
   
    GENERAL.  Except as otherwise required by the Delaware General Corporation
Law ("DGCL") or as otherwise provided in the Company's Amended Restated
Certificate, each share of Class A Common Stock and each share of Common Stock
have identical powers, preferences and rights in all other respects. There are
no redemption or sinking fund provisions applicable to the Class A Common Stock
or the Common Stock. Holders of Class A Common Stock and Common Stock are not
subject to further calls or assessments by the Company. All outstanding shares
of Class A Common Stock and Common Stock, when validly issued, will be fully
paid and non-assessable.
    
 
   
    VOTING.  The holders of shares of Common Stock are entitled to one vote on
any matter to be voted on by the stockholders of the Company. There is no
provision in the Company's Amended Restated Certificate permitting cumulative
voting. The holders of shares of Class A Common Stock are not entitled to vote
on any matter to be voted on by the stockholders of the Company, except as
required under the DGCL or the Company's Amended Restated Certificate.
    
 
   
    Under the Amended Restated Certificate and the DGCL, only the affirmative
vote of the holders of a majority of the outstanding shares of Common Stocks
entitled to vote will be required to amend the Restated Certificate or to
authorize additional shares of Class A Common Stock or Common Stock; and the
affirmative vote of the holders of a majority of the outstanding shares of the
Common Stocks entitled to vote will be required to approve any merger or
consolidation of the Company with or into any other corporation or sale of
substantially all its assets or to approve the dissolution of the Company,
subject to the provisions of Article Ninth of the Company's Restated Certificate
that requires approval by the vote of the holders of at least 80% of the
outstanding voting capital stock of the Company in those circumstances
    
 
                                       15
<PAGE>
   
described below under "Certain Effects of the Amendment--Effect on Fair Price
Provision.". Except under limited circumstances described below, the holders of
the Common Stock will elect the entire Board of Directors. In addition, as
permitted under the DGCL, the Amended Restated Certificate will provide that the
number of authorized shares of either class may be increased or decreased, but
not below the number of shares then outstanding, by the affirmative vote of the
holders of a majority of the outstanding shares of the Common Stock entitled to
vote.
    
 
   
    Under the DGCL, the holders of Class A Common Stock will be entitled to vote
on proposals to change the par value of the Class A Common Stock or to alter or
change the powers, preferences or special rights of shares of Class A Common
Stock, including the Class A Protection Provision, which may affect them
adversely. Additionally, the Class A Common Stock will be entitled to certain
additional voting rights in those circumstances described below under
"Additional Voting Rights of the Class A Common Stock."
    
 
   
    DIVIDENDS AND DISTRIBUTIONS.  Each share of Class A Common Stock and Common
Stock will be equal in respect to dividends and other distributions in cash,
stock or property, including distributions in connection with any and upon
liquidation, dissolution, or winding up of the Company, except that (i) a
dividend or distribution in cash or property on a share of Class A Common Stock
may be greater than any dividend or distribution in cash or property on a share
of Common Stock, and (ii) dividends or other distributions payable on the Class
A Common Stock and Common Stock in shares of capital stock shall be made to all
holders of the Class A Common Stock and Common Stock and may be made (a) in
shares of Class A Common Stock to the holders of Class A Common Stock and in
shares of Common Stock to the holders of Common Stock, (b) in shares of Class A
Common Stock to the holders of Class A Common Stock and to holders of Common
Stock, or (c) in any other authorized class or series of capital stock to the
holders of Class A Common Stock and Common Stock. In no event will either the
Class A Common Stock or Common Stock be split, subdivided, or combined unless
the other is proportionately split, subdivided, or combined.
    
 
   
    Although the Board of Directors would have authority under the Amended
Restated Certificate to pay dividends and make distributions on the Class A
Common Stock in amounts greater than on the Common Stock, the Board of Directors
currently intends that future dividends will be paid on both classes on an equal
per share basis.
    
 
   
    MERGERS AND CONSOLIDATIONS.  Each holder of Class A Common Stock and Common
Stock will be entitled to receive the same per share consideration in the event
of a merger or consolidation.
    
 
   
    CLASS A PROTECTION.  Once the Amendment becomes effective, voting rights
disproportionate to equity ownership could be acquired through acquisitions of
Common Stock without corresponding purchases of Class A Common Stock, and the
Common Stock could therefore trade at a premium to the Class A Common Stock
under certain circumstances. In order to reduce or eliminate the economic
reasons for the Common Stock and Class A Common Stock to trade at disparate
market prices and to give holders of Class A Common Stock the opportunity to
participate in any premium paid in the future for a significant block (15% or
more) of the Common Stock by a buyer who has not acquired a proportionate share
of Class A Common Stock, the Board of Directors determined that the Amendment
would include a "Class A Protection Provision." The Class A Protection Provision
might have an anti-takeover effect by making the Company a less attractive
target for a takeover bid. As discussed below, there can be no assurance that
the Company will in all instances be able to readily identify persons whose
holdings subject them to the Class A Protection Provision.
    
 
                                       16
<PAGE>
   
    The Class A Protection Provision provides that if any person or group (other
than the Company), acquires beneficial ownership of 15% or more of the then
outstanding shares of Common Stock after the Effective Time of the Amendment,
and such person or group (a "Significant Stockholder") does not immediately
after such acquisition beneficially own an equal or greater percentage of all
then outstanding shares of Class A Common Stock, such Significant Stockholder
must, within a 90-day period beginning the day after becoming a Significant
Stockholder, commence a public cash tender offer as described below to acquire
additional shares of Class A Common Stock (a "Class A Protection Transaction").
If a Significant Stockholder does not undertake the required Class A Protection
transaction, he would lose the right to vote those shares of Common Stock
acquired after the Effective Time. For example, if a stockholder owns 4% of the
Common Stock prior to the adoption of the Amendment and thereafter purchases an
additional 16% of the Common Stock without purchasing any additional Class A
Common Stock, such stockholder will not be allowed to vote the 16% of the Common
Stock acquired after the Effective Time of the Amendment unless he commences a
tender offer for an additional 16% of the Class A Common Stock at the prescribed
price. Alternatively, such stockholder could sell that number of shares equal to
2% of the outstanding Common Stock, thus dropping the percentage of Common Stock
acquired by him after the Effective Time of the Amendment to 14%, leaving him
with an aggregate of 18% of the Common Stock, all of which he could vote.
    
 
   
    The 15% Common Stock ownership threshold which initially triggers a Class A
Protection Transaction may not be waived by the Board of Directors, nor may the
Board of Directors amend this threshold in the Amended Restated Certificate
without stockholder approval, including under the Amended Restated Certificate,
a majority vote of the outstanding Class A Common Stock voting separately as a
class.
    
 
   
    In connection with the application of the Class A Protection Provision, the
following shares of the Company's Common Stock shall be excluded from any
determination of the shares of Common Stock owned by a person or group, but not
for the purpose of determining shares outstanding: (i) shares beneficially owned
at the Effective Time; (ii) shares acquired by will, by laws of descent and
distribution, by gift, or by foreclosure of a bona fide loan; (iii) shares
acquired from the Company; (iv) shares acquired by operation of law (including a
merger or consolidation effected for the purpose of recapitalizing or
reincorporating such person but not for the purpose of acquiring another
person); (v) shares acquired in exchange for shares of Class A Common Stock if
the Class A Common Stock were acquired by the exchanging party directly from the
Company in any stock split or as a dividend on Common Stock; and (vi) shares
acquired by or from a qualified employee benefit plan of the Company
(collectively the "Excluded Shares").
    
 
   
    In each Class A Protection Transaction, the Significant Stockholder must
make a public tender offer to acquire at least that number of additional shares
of Class A Common Stock (the "Additional Shares") determined by (i) multiplying
the percentage of the number of shares of outstanding Common Stock beneficially
owned and acquired after the Effective Time by such Significant Stockholder by
the total number of shares of Class A Common Stock outstanding on the date such
Person or group became a Significant Stockholder; and (ii) subtracting therefrom
the number of shares of Class A Common Stock beneficially owned by such
Significant Stockholder on the date such Person became a Significant Shareholder
which were acquired after the Effective Time. The Significant Stockholder must
acquire all Class A Common Stock validly tendered or, if the number of shares
tendered exceeds the number determined pursuant to such formula, a pro-rata
number of Class A Common Stock from each tendering holder (based on the number
of shares of Class A Common Stock tendered by each tendering stockholder).
    
 
                                       17
<PAGE>
   
    The offer price for any shares of Class A Common Stock required to be
purchased by the Significant Stockholder pursuant to this provision would be the
greatest of: (i) the highest price per share paid by the Significant Stockholder
for any share of Class A Common Stock or Common Stock in the six-month period
ending on the date such person or group became a Significant Stockholder (or
such shorter period after the Effective Time if the date such person or group
became a Significant Stockholder is not more than six months following the
Effective Time); (ii) the highest reported sale price of a share of Class A
Common Stock or Common Stock on The NASDAQ Stock Market National Market System
(or such other securities exchange or quotation system as is then the principal
trading market for such shares) during the thirty-day period preceding the date
such person or group became a Significant Stockholder; or (iii) the highest
reported sale price for a share of Class A Common Stock or a share of Common
Stock on The NASDAQ Stock Market National Market System (or such other
securities exchange or quotation system constituting the principal trading
market for such shares) on the business day preceding the date the Significant
Stockholder commences the required tender offer.
    
 
   
    A Class A Protection Transaction would also be required of any Significant
Stockholder that acquires an additional amount of Common Stock equal to or
greater than the next higher multiple of 5% (e.g., 20%, 25%, 30%, etc.) of the
outstanding Common Stock (excluding Excluded Shares) after the Effective Time if
such Significant Stockholder does not then own an equal or greater percentage of
all then outstanding Class A Common Stock that such Significant Stockholder
acquired after the Effective Time. Such Significant Stockholder would be
required to make a public cash tender offer to buy that number of Additional
Shares determined in accordance with the formula set forth above in the second
preceding paragraph at the offer price described in the immediately preceding
paragraph, even if a previous Class A Protection Transaction resulted in fewer
shares of Class A Common Stock being tendered than the Significant Stockholder
was required to offer to purchase in the previous offer.
    
 
   
    The requirement to engage in a Class A Protection Transaction will be
satisfied by making the requisite offer and purchasing validly tendered shares,
even if the number of shares tendered is less than the number of shares the
Significant Stockholder was required to offer to purchase. If any Significant
Stockholder fails to make the required tender offer, or to purchase shares
validly tendered (after proration, if any), the voting rights of all Common
Stock owned by such Significant Stockholder and acquired after the Effective
Time will be automatically suspended until consummation of an offer as required
by the terms of the Class A Protection feature or until divestiture of the
excess Common Stock that triggered the tender offer requirement. To the extent
that the voting power of any Common Stock is so suspended, such shares will not
be included in the determination of aggregate voting shares for any purpose.
    
 
   
    Neither the Class A Protection Transaction requirement nor the related
possibility of suspension of voting rights applies to any increase in percentage
ownership of Common Stock resulting solely from a change in the total number of
shares of Common Stock outstanding. All calculations with respect to percentage
ownership of outstanding shares of either class of Common Stock shall be based
upon the number of outstanding shares reflected in either the records of or a
certificate from the Company's stock transfer agent or reported in the last to
be filed of the Company's Annual Report on Form 10-K, Quarterly Report on Form
10-Q, Current Report on Form 8-K or definitive proxy statement.
    
 
   
    Since the definition of Significant Stockholder is based on the beneficial
ownership percentage of Common Stock acquired after the Effective Time of the
Amendment, a person or group who is a stockholder of the Company at the
Effective Time will not become a Significant Stockholder unless such person or
group acquires an additional 15% of the then outstanding Common Stock,
regardless of the
    
 
                                       18
<PAGE>
   
number of shares of Common Stock owned prior to the Effective Time of the
Amendment. For purposes of the Class A Protection feature, the terms "beneficial
ownership" and "group" generally have the same meanings as used in Regulation
13D promulgated under the Securities Exchange Act of 1934 (the "Exchange Act"),
subject to certain exceptions set forth therein.
    
 
   
    The Class A Protection provision does not prevent any person or group from
acquiring a significant or controlling interest in the Company, provided such
person or group acquires a proportionate percentage of the Class A Common Stock,
undertakes a Class A Protection Transaction or incurs the suspension of the
voting rights of the Common Stock as provided by the Class A Protection feature.
If a Class A Protection Transaction is required, the purchase price to be paid
in such offer may be higher than the price at which a Significant Stockholder
might otherwise be able to acquire an identical number of Class A Common Stock.
Such requirement could make an acquisition of a significant or controlling
interest in the Company more expensive and, if the Class A Protection
Transaction is required, more time consuming, than if such requirement did not
exist. Consequently, a person or group might be deterred from acquiring a
significant or controlling interest in the Company as a result of such
requirement. See "Certain Potential Disadvantages of the Amendment--Change of
Control Impact." However, by restricting the ability of an acquiror to acquire a
significant interest in the Common Stock by paying a "control premium" for such
shares without acquiring, or paying a similar premium for, Class A Common Stock,
the Class A Protection feature is designed to help reduce or eliminate any
discount on either of these classes of Common Stocks.
    
 
   
    There can be no assurance that the Company will be able to readily identify
a person or group as a Significant Stockholder. Although the Exchange Act
requires persons or groups holding 5% or more of the Common Stock or the Class A
Common Stock to file reports with the Commission and the Company specifying the
level of their ownership, there can be no assurance that a person or group will
comply with such law or that alternative methods of identifying such holders
will be available. As a result, the benefits of the Class A Protection feature
may be difficult to enforce.
    
 
   
    ADDITIONAL VOTING RIGHTS OF CLASS A COMMON STOCK.  Neither the Common Stock
nor the Class A Common Stock will be convertible into another class of common
stock or any other security of the Company. However, the holders of outstanding
Class A Common Stock will be entitled to one vote per share of Class A Common
Stock on all matters presented to the stockholders of the Company automatically
(i) at any time when the number of outstanding shares of Common Stock falls
below 10% of the aggregate number of outstanding Common Stock and Class A Common
Stock; and (ii) upon resolution of the Board of Directors if, as a result of the
existence of the Class A Common Stock, either the Common Stock or Class A Common
Stock or both, are excluded from trading on The NASDAQ Stock Market National
Market System and other comparable quotation systems then in use, and are
excluded from trading by the New York Stock Exchange, American Stock Exchange
and all other principal national securities exchanges then in use. Upon any such
change, the voting interests of the holders of outstanding Common Stock would be
diluted. In addition, to the extent that the market price of the Common Stock is
higher or lower than the market price of the Class A Common Stock immediately
prior to such change, the market price of the shares held by particular holders
may be adversely affected by the change.
    
 
   
    PREEMPTIVE RIGHTS.  None of the Common Stock or the Class A Common Stock
will carry any preemptive rights enabling a holder to subscribe for or receive
shares of the Company of any class or any other securities convertible into any
class of the Company's shares.
    
 
   
    TRANSFERABILITY; TRADING MARKET.  Like the Common Stock, the Class A Common
Stock will be freely transferable. The Common Stock is currently listed on The
NASDAQ Stock Market and the Company is
    
 
                                       19
<PAGE>
   
filing an application with The NASDAQ Stock Market to list the Class A Common
Stock. It is expected that the Common Stock will continue to be, and the Class A
Common Stock will be, approved for quotation on The NASDAQ Stock Market National
Market System.
    
 
   
    INCREASE IN AUTHORIZED CAPITAL STOCK.  The current Restated Certificate of
Incorporation of the Company authorizes 25,000,000 shares of Common Stock. The
Amendment would increase the authorized number of shares of Common Stocks to
45,000,000, consisting of 20,000,000 shares of Class A Common Stock and
25,000,000 shares of Common Stock. After the effectiveness of the Amendment and
the Stock Dividend, approximately 11.4 million shares of each of the Common
Stock and Class A Common Stock would be issued and outstanding. Additional
Common Stock and Class A Common Stock would therefore be available for issuance
from time to time in the future for any proper corporate purpose, including
public and private equity offerings, stock splits, stock dividends,
acquisitions, stock option plans, and funding of employee benefit plans. No
further action or authorization by the stockholders would be necessary prior to
the issuance of the additional shares of Common Stocks authorized pursuant to
the Amendment unless applicable laws or regulations would require such approval
in a given instance. The future issuance by the Company of shares of Common
Stock and Class A Common Stock may dilute the equity ownership position of
current holders of Common Stock and Class A Common Stock.
    
 
   
    The Board of Directors of the Company believes that it is desirable to have
the additional authorized shares of Common Stocks available for possible future
financings, acquisition transactions, and other general corporate purposes.
Having such additional authorized shares of Common Stocks available for issuance
in the future would give the Company greater flexibility and may allow such
shares to be issued without the expense and delay of a special stockholders'
meeting. At the date hereof, other than pursuant to the stock incentive plans of
the Company described below, the Company has no existing agreements,
understandings or plans for the issuance of additional shares of Common Stocks.
Unissued shares of Common Stocks could be issued in circumstances that would
serve to preserve control of the Company's then existing management. Absent the
special circumstances described above, the Company's Amended Restated
Certificate would permit the holders of a majority of the outstanding Common
Stock voting as a single class to amend the Amended Articles to increase the
number of authorized shares of any class of Common Stocks; the holders of Class
A Common Stock would have no right to participate in any such vote.
    
 
   
    STOCKHOLDER INFORMATION.  The Company would deliver to the holders of Class
A Common Stock the same proxy statements (without proxies except as required by
law), annual reports and other information and reports as it delivers to holders
of Common Stock.
    
 
   
                        CERTAIN EFFECTS OF THE AMENDMENT
    
 
   
    EFFECTS ON RELATIVE OWNERSHIP INTEREST AND VOTING POWER.  Because the
Amendment does not affect the number of issued shares of Common Stock and
because the Stock Dividend, if distributed as planned, would be made in
proportion to the number of shares of Common Stock owned on the Stock Dividend
Record Date by each stockholder, the relative ownership interest and voting
power of each record holder of Common Stock would be unaffected by the Stock
Dividend. Consequently, assuming that the members of the Hach family retain
their shares of Common Stock, the Amendment and the Stock Dividend will not
alter the Hach family's present voting position in the Company.
    
 
   
    Stockholders who sell their Common Stock after the Stock Dividend Record
Date would lose a greater amount of voting power in proportion to equity than
they would have prior to such time. At the
    
 
                                       20
<PAGE>
   
same time, stockholders desiring to maintain a long-term investment in the
Company will be free to continue to hold the Common Stock and retain the
benefits of the voting power attached to such Common Stock.
    
 
   
    As of the date of this Proxy Statement members of the Hach family owned an
aggregate of approximately         shares or 42% of the Common Stock of the
Company. Accordingly, the Hach family will receive an aggregate of
shares of Class A Common Stock as a result of the Stock Dividend.
    
 
   
    If the Hach family, following the Stock Dividend, if distributed as planned,
were to sell all of the shares of Class A Common Stock received as a result of
the Stock Dividend, the Hach family would still have approximately 42% of the
voting power assuming no other change. The foregoing is for illustrative
purposes only and is in no way intended to suggest that the Hach family has any
intention of selling any or all of its shares of Class A Common Stock or Common
Stock following the Stock Dividend, if it is distributed. The Company has been
advised that it is the present intention of members of the Hach family to hold
their shares of Common Stock and to dispose of shares of Class A Common Stock if
they were to dispose of any shares.
    
 
   
    EFFECT ON MARKET PRICE.  The market price of shares of Class A Common Stock
and Common Stock after the Stock Dividend, if distributed as planned, will
depend, as before the effectiveness of the Amendment and the Stock Dividend, on
many factors, including among others, the future performance of the Company,
general market conditions, and conditions relating to companies similar to the
Company in its business and industry in general. Accordingly, the Company cannot
predict the prices at which the Class A Common Stock and Common Stock will trade
following the effectiveness of the Amendment and the distribution of the Stock
Dividend or whether one class will trade at a premium over the other class. The
Company anticipates that any differential between the trading prices of the
Common Stock and Class A Common Stock will be modest, but there can be no
assurance as to the trading prices of either of them. On June 12, 1997, the
closing sale price of the Common Stock as reported on The NASDAQ Stock Market
was $         . As a result of the Stock Dividend, if it is distributed, the
market price of each of the Common Stock and Class A Common Stock is expected to
be approximately half the market price of the Common Stock immediately prior to
the distribution of the Stock Dividend. However, there can be no assurance that
the Stock Dividend, or future issuances of either Common Stock or Class A Common
Stock will not result in a reduction of the market price of the Company's Common
Stocks or adversely affect the liquidity of the Company's Common Stocks. If the
market price of the Class A Common Stock were to drop significantly below the
price of the Common Stock, the potential benefits of the Amendment with respect
to flexibility for financings by the Company or resales by the stockholders may
be limited.
    
 
   
    It is possible that either the Class A Common Stock or Common Stock may
trade from time to time at a premium to the other. The Class A Protection
Provision and the flexibility afforded by the provision permitting the Board of
Directors, in its discretion, should it so determine in the future to declare
larger dividends on the Class A Common Stock are expected to reduce somewhat the
reasons for the Common Stock to trade at a premium compared to the Class A
Common Stock. Should a premium on either the Class A Common Stock or the Common
Stock develop, the Amendment permits the Board of Directors to issue and sell
authorized but unissued shares of either the Class A Common Stock or the Common
Stock even if the consideration which could be obtained by issuing or selling
shares of the other class may be greater. The Amendment also expressly permits
the Board of Directors to purchase shares of either the Class A Common Stock or
the Common Stock even if the consideration which would be paid for shares of
another class may be less.
    
 
                                       21
<PAGE>
   
    Because the market price of the Common Stock is expected to be approximately
one-half of its price prior to the Stock Dividend (if it is distributed as
planned), it will be possible to acquire more voting Common Stock for a given
amount of consideration after the Stock Dividend. Therefore, subject to the
requirement to purchase a proportionate amount of Class A Common Stock under
certain circumstances pursuant to Class A Protection provision discussed above,
the Amendment and Stock Dividend, if distributed as planned would permit
stockholders, including the Hach family, to increase their relative voting
control at a lower cost. The Hach family has advised the Company that it has no
present plans to acquire any additional shares of Common Stock after the Stock
Dividend, if distributed as planned.
    
 
   
    TRADING MARKET.  Upon effectiveness of the Amendment, approximately 11.4
million shares of Common Stock will also be issued and outstanding. If the Stock
Dividend is distributed as planned, approximately 11.4 million shares of Class A
Common Stock will be issued and outstanding. To minimize dilution of voting
power to existing stockholders, the Company is more likely to issue additional
shares of Class A Common Stock than Common Stock in the future to raise equity
capital, finance acquisitions, or fund employee benefit plans. Furthermore,
members of the Hach family are more likely to dispose of Class A Common Stock
over time rather than Common Stock. Any such issuance of additional Class A
Common Stock by the Company or dispositions of Class A Common Stock by members
of the Hach family or other major stockholders may serve to further increase
market activity in the Class A Common Stock relative to the Common Stock.
Greater market activity may result in increased volatility in pricing and could
enlarge any price differential, either higher or lower, between the Class A
Common Stock and Common Stock.
    
 
   
    BENEFIT PLANS.  The incentive stock plans of the Company that will be
affected by the Amendment are the (i) 1993 Employee Stock Option Plan (the
"Employee Option Plan"), (ii) 1995 Non-Employee Directors Stock Plan (the
"Director Option Plan"), (iii) the Employee Stock Ownership Plan (the "ESOP"),
(iv) the Employee Stock Purchase Plan (the "Stock Purchase Plan") and (v) the
Employees' Profit Sharing Plan (the "Profit Sharing Plan").
    
 
   
    With respect to the Employee Option Plan and the Director Option Plan (the
"Option Plans"), outstanding options will be adjusted appropriately to reflect
the Amendment and the Stock Dividend. In addition, the Board of Directors
anticipates amending the Option Plans to provide that options granted thereunder
after the Effective Time may relate solely to Common Stock, solely to Class A
Common Stock, or to a combination of the two, at the discretion of the committee
administering such plan, and will adjust the shares of Common Stocks reserved
for issuance under the Option Plans accordingly.
    
 
   
    The Board of Directors anticipates amending the Stock Purchase Plan to
provide that all purchases under the Stock Purchase Plan for the offering
periods beginning after the Effective Time will be for shares of Class A Common
Stock.
    
 
   
    As with any stockholder of the Company, if the Stock Dividend is
distributed, the ESOP and the Profit Sharing Plan will receive one share of
Class A Common Stock for each share of Common Stock it holds as of the Stock
Dividend Record Date. As of June 12, 1997, the ESOP held an aggregate of
shares of Common Stock, and the Profit Sharing Plan held an aggregate of
shares of Common Stock. In addition, the Board of Directors anticipates amending
the Profit Sharing Plan to authorize the Company to make its required matching
contributions under the 401(k) component of the Profit Sharing Plan solely in
Common Stock, solely in Class A Common Stock, or in a combination of the two, at
the discretion of the Plan trustees.
    
 
                                       22
<PAGE>
   
    BOOK VALUE AND EARNINGS PER SHARE.  Although the interest of each
stockholder in the total equity of the Company will remain unchanged as a result
of the Stock Dividend, if it is distributed, the issuance of the Class A Common
Stock pursuant to the Stock Dividend will, like any stock dividend, cause the
book value and earnings per share of the Company to be adjusted to reflect the
increased number of shares outstanding. Although effected in the form of a
dividend, for accounting purposes, the Stock Dividend, if it is distributed,
will be treated as a two-for-one stock split effected in the form of a stock
dividend.
    
 
   
    EFFECT ON FAIR PRICE PROVISION.  Article Ninth of the Company's Restated
Articles, which was adopted in 1977, requires, subject to certain exceptions,
the affirmative vote of the holders of at least 80% of all outstanding shares of
capital stock of the Company entitled to vote on all matters that may come
before a meeting of stockholders in order to (i) effect a merger or
consolidation of the Company or any subsidiary with or into another corporation
or (ii) authorize the sale, lease, exchange or other disposition by the Company
or any subsidiary of all or a substantial part of the assets of the Company or
any subsidiary to any corporation, person or entity or (iii) authorize the
Company or its subsidiary to issue or transfer more than 10% of the Company's
outstanding voting securities or any securities of any subsidiary to any other
corporation, person or entity in exchange for securities, cash or other
property, if, in any of the above cases, such other corporation, person or
entity including its affiliates and associated persons, is the beneficial owner,
directly or indirectly, of 5% or more of the outstanding shares of capital stock
of the Company entitled to vote on all matters that may come before such meeting
of stockholders (an "Interested Party"). The requirement for approval by an 80%
vote is not applicable to any of the above referenced transactions if (i) the
Board of Directors by resolution has approved a memorandum of understanding with
the other party substantially consistent with such transaction prior to the time
such party became a holder of more than 5% of the capital stock of the Company
or (ii) the Company or any subsidiary is at the time of the consummation of such
transaction is the beneficial owner of (x) a majority, by vote, of the
outstanding shares of all classes of capital stock entitled to vote in elections
for directors of such other corporation or (y) a majority by voting interest in
the other entity when the transaction is consummated. Once the Amendment is
effective, the provisions of Article Ninth will continue to be generally
applicable to those transactions, and in the manner, described in Article Ninth,
except that, unless the Class A Common Stock becomes entitled to the additional
voting rights described above, (i) holders of Class A Common Stock will not be
entitled to vote on the approval of a proposed transaction with an Interested
Party and (ii) a person's ownership of Class A Common Stock will not be counted
in determining whether such person is an "Interested Party" under Article Ninth.
    
 
   
    CERTAIN FEDERAL INCOME TAX CONSEQUENCES.  The following is a summary of
certain U.S. federal income tax consequences to the stockholders of the Company
resulting from the distribution of Class A Common Stock to the holders of Common
Stock. The following discussion is based upon current provisions of the Internal
Revenue Code of 1986, as amended (the "Code"), its legislative history,
administrative pronouncements, judicial decisions and Treasury Regulations, all
of which are subject to change, possibly with retroactive effect. The following
discussion assumes that the stockholders hold their Common Stock as a capital
asset. The following discussion does not purport to be a complete discussion of
all U.S. federal income tax considerations resulting from the distribution of
Class A Common Stock to the holders of Common Stock. The following discussion
also does not address the tax consequences resulting from the distribution of
Class A Common Stock to the holders of Common Stock under state, local or
non-U.S. tax laws. In addition, the following discussion may not apply, in whole
or in part, to particular categories of stockholders of the Company, such as
dealers in securities, insurance companies, foreign persons, tax-exempt
organizations, financial institutions and stockholders that acquired Common
Stock upon the
    
 
                                       23
<PAGE>
   
exercise of compensatory stock options or otherwise as compensation. No ruling
on the federal, state or local tax considerations resulting from the
distribution of Class A Common Stock to holders of Common Stock has been
requested or is expected from the Internal Revenue Service or any other taxing
authority. THE FOLLOWING DISCUSSION IS INCLUDED FOR GENERAL INFORMATION ONLY.
ALL STOCKHOLDERS OF THE COMPANY ARE URGED TO CONSULT THEIR TAX ADVISORS TO
DETERMINE THE SPECIFIC TAX CONSEQUENCES RESULTING FROM THE DISTRIBUTION OF CLASS
A COMMON STOCK TO HOLDERS OF COMMON STOCK INCLUDING ANY STATE, LOCAL OR NON-U.S.
TAX CONSEQUENCES.
    
 
   
    A holder of Common Stock will recognize no income, gain or loss on the
receipt of Class A Common Stock from the Company. In addition, the Company will
recognize no income, gain or loss on the distribution of Class A Common Stock to
the holders of Common Stock.
    
 
   
    A stockholder's aggregate tax basis in its Common Stock will be allocated
between its Class A Common Stock and its Common Stock in proportion to the fair
market value of each share of Class A Common Stock and Common Stock at time of
the distribution of the Stock Dividend. If a stockholder acquired its shares of
Common Stock in different lots at different prices, the basis of the shares of
Class A Common Stock received will be calculated separately with respect to each
lot of Common Stock on which Class A Common Stock is received, provided such
stockholder takes adequate steps to identify the shares of Class A Common Stock
received with respect to the different lots of Common Stock. A stockholder's
holding period for its Class A Common Stock will include such a stockholder's
holding period for its Common Stock.
    
 
   
    A shareholder will recognize no income, gain or loss upon becoming entitled
to one vote per share of Class A Common Stock on all matters presented to
shareholders pursuant to the additional voting rights feature described above.
The tax basis and holding of the shares of Class A Common Stock will be
unchanged.
    
 
   
    SECURITIES ACT OF 1933.  No "offer," "offer to sell," "offer for sale," or
"sale" of a security within the meaning of Section 2(3) of the Securities Act
and Rule 145 thereunder will occur as a result of the Amendment. In addition,
the Stock Dividend, if distributed as planned, will not involve a "sale" of a
security under the Act or Rule 145. Consequently, the Company is not required to
register and has not registered the Class A Common Stock under the Act.
    
 
   
    Because the Amendment and Stock Dividend do not constitute a "sale" of the
Class A Common Stock, stockholders would not be deemed to have acquired such
shares separately from the Common Stock for purposes of the Securities Act and
Rule 144 thereunder. Class A Common Stock held immediately upon effectiveness of
the Amendment and the Stock Dividend, other than any such shares held by
affiliates of the Company within the meaning of the Securities Act, may be
offered for sale and sold in the same manner as the Common Stock without
registration under the Securities Act. Affiliates of the Company, including
certain members of the Hach Family, and holders of "restricted" shares would
continue to be subject to the restrictions specified in Rule 144 under the
Securities Act with respect to sales of shares of Class A Common Stock and
Common Stock.
    
 
   
    THE NASDAQ STOCK MARKET CRITERIA.  The Common Stock is currently traded on
The NASDAQ Stock Market National Market System and application is being made to
trade the Class A Common Stock on The NASDAQ Stock Market National Market
System. The NASDAQ Stock Market has advised the Company that the issuance of
nonvoting Class A Common Stock pursuant to the Amendment and the
    
 
                                       24
<PAGE>
   
Stock Dividend would not violate the rules and regulations of The NASDAQ Stock
Market and would be permitted thereunder. The Company presently anticipates that
the Common Stock will remain approved for trading, and the Class A Common Stock
will be approved for trading, on The NASDAQ Stock Market.
    
 
   
    SUBSEQUENT AMENDMENTS.  The Amendment would not prevent the Company from
taking any action, or otherwise affect the Company's ability, with the requisite
approval of its stockholders, to adopt any future amendments to the Amended
Restated Certificate for the purpose of further changing the Company's capital
structure or for any other lawful purpose.
    
 
                          INTERESTS OF CERTAIN PERSONS
 
   
    Members of the Hach Family have an interest in the implementation of the
Amendment and Stock Dividend because, as noted above, they may retain their
current effective control of the Company, even if they dispose of some or all of
the Class A Common Stock received by them as a result of the implementation of
the Amendment and Stock Dividend, if it is distributed. Also, as a result of the
Amendment and Stock Dividend, members of the Hach Family will be able to
increase their voting power without increasing their equity investment by
selling Class A Common Stock and by purchasing Common Stock with the proceeds
(subject to the Class A Protection provision). In addition, Kathryn Hach-Darrow,
Bruce J. Hach and Gary R. Dreher are members of the Company's senior management,
as well as members of the Board of Directors. The Company is not aware of any
current plans of members of the Hach family or senior management to acquire any
additional shares of the Company's Common Stocks after the Effective Time of the
Amendment and the Stock Dividend (except to the extent such individuals may
participate in director and employee incentive and benefit plans of the
Company). For information related to the stock ownership of certain members of
the Hach family and the Company's officers and directors, see "Stock Ownership
of Certain Beneficial Owners."
    
 
             SELECTED TRADING ACTIVITY, MARKET PRICES AND DIVIDENDS
 
   
    The Company's Common Stock is traded on The NASDAQ Stock Market (symbol:
HACH). The average daily trading volume for each quarter of the fiscal year
ended April 30, 1997, and the range of daily high and low last sale prices of
the Common Stock for the periods as reported by The National Quotations Bureau,
Inc., are as follows:
    
 
   
<TABLE>
<CAPTION>
                                                                                                     LAST SALE PRICE
                                                                                   AVERAGE DAILY   --------------------
FISCAL YEAR ENDED APRIL 30, 1997                                                      VOLUME         HIGH        LOW
- --------------------------------------------------------------------------------  ---------------  ---------  ---------
<S>                                                                               <C>              <C>        <C>
First Quarter...................................................................         2,450     $   17.50  $   14.50
Second Quarter..................................................................         2,080     $   20.00  $   14.88
Third Quarter...................................................................         1,580     $   19.00  $   16.25
Fourth Quarter..................................................................         1,908     $   19.75  $   14.50
</TABLE>
    
 
- ------------------------
 
   
    As of June 12, 1997, there were approximately       holders of record of the
Company's common stock.
    
 
    During the fiscal year ended April 30, 1997, the Company declared cash
dividends of $.06 cents per share for each fiscal quarter. During the fiscal
year ended April 30, 1996, the Company declared cash dividends of $.05 cents per
share for each of the first two fiscal quarters and $.06 per share for each of
the third and fourth fiscal quarters.
 
                                       25
<PAGE>
                                    EXPENSES
 
   
    The costs of proceeding with the Amendment (such as transfer agent's fees,
printing and mailing costs, legal fees, financial advisory fees, and The NASDAQ
Stock Market fees) are estimated to be approximately $         , inclusive of
fees of financial and legal advisors.
    
 
                                 VOTE REQUIRED
 
   
    The affirmative vote of holders of a majority of the outstanding Common
Stock is needed to approve the Amendment. Unless otherwise directed, proxies in
the accompanying form will be voted "FOR" the Amendment. AS NOTED ABOVE, THE
BOARD OF DIRECTORS RECOMMENDS THAT THE STOCKHOLDERS VOTE "FOR" APPROVAL OF THE
AMENDMENT.
    
 
                             STOCKHOLDER PROPOSALS
 
    As described in the Company's Proxy Statement relating to its 1996 annual
meeting of stockholders, any proposal which a stockholder intends to present at
the 1997 annual meeting of stockholders was required to be received by the
Company not later than March 25, 1997, in order to be considered for inclusion
in the Company's Proxy Statement and form of proxy relating to the 1997 annual
meeting of stockholders. No such proposals were received.
 
                                 OTHER MATTERS
 
   
    No business other than to consider and vote upon the Amendment will be
transacted at the Special Meeting, except for possible adjournments or
postponements thereof. If any matters other than a vote on the Amendment should
come properly before the Special Meeting, it is the intention of the persons
named in the accompanying proxy to vote such proxies in accordance with their
best judgment.
    
 
                                       26
<PAGE>
                                   EXHIBIT A
               ARTICLE FOURTH OF THE CERTIFICATE OF INCORPORATION
                                OF HACH COMPANY
                     AS PROPOSED TO BE AMENDED AND RESTATED
 
   
    FOURTH: The total number of shares of all classes of capital stock which the
Corporation shall have authority to issue is forty-five million (45,000,000)
shares which shall be divided into two classes as follows:
    
 
   
    (a) Twenty Million (20,000,000) shares of Class A Common Stock of the par
       value of one dollar ($1.00) per share; and
    
 
   
    (b) Twenty Five Million (25,000,000) shares of Common Stock of the par value
       of one dollar ($1.00) per share.
    
 
   
    The Class A Common Stock and Common Stock are hereinafter collectively
referred to as the "Common Stocks." The designations and powers, preferences and
rights, and the qualifications, limitations and restrictions thereof, of the
above classes of stock shall be as follows:
    
 
   
    1.  RIGHTS. Except as otherwise required by law or as otherwise provided in
this Article Fourth, each share of Class A Common Stock and each share of Common
Stock shall have identical powers, preferences, qualifications, limitations and
other rights.
    
 
   
    2.  DIVIDENDS. Subject to all of the rights of any class of stock authorized
after the effective date of this provision of Article Fourth ranking senior to
the Common Stocks as to dividends, dividends may be paid upon the Class A Common
Stock and the Common Stock as and when declared by the Board of Directors out of
funds and other assets legally available for the payment of dividends. If and
when dividends on the Class A Common Stock and the Common Stock are declared and
payable from time to time by the Board of Directors whether payable in cash, in
property or in shares of stock of the Corporation, the holders of the Class A
Common Stock and the holders of the Common Stock shall be entitled to share
equally, on a per share basis, in such dividends, except that (a) a dividend or
distribution in cash or property on a share of Class A Common Stock may be
greater than a dividend or distribution in cash or property on a share of Common
Stock, and (b) dividends or other distributions payable on the Common Stocks in
shares of any authorized class or series of capital stock of the Corporation may
be made (i) in shares of Class A Common Stock to the holders of Class A Common
Stock and in shares of Common Stock to the holders of Common Stock, (ii) in
shares of Class A Common Stock to the holders of Class A Common Stock and to the
holders of Common Stock, or (iii) in any other authorized class or series of
capital stock to the holders of both classes of Common Stocks.
    
 
   
    3.  LIQUIDATION. In the event of any liquidation, dissolution or winding up
of the Corporation, whether voluntary or involuntary, and after the holders of
any class of stock authorized after the effective date of this provision of
Article Fourth ranking senior to the Common Stocks as to assets shall have been
paid in full the amounts to which such holders shall be entitled, or an amount
sufficient to pay the aggregate amount to which such holders shall be entitled
shall have been set aside for the benefit of the holders of such stock, the
remaining net assets of the Corporation shall be distributed PRO RATA to the
holders of both classes of Common Stocks.
    
 
    4.  MERGER AND CONSOLIDATION. In the event of a merger or consolidation of
the Corporation with or into another entity (whether or not the Corporation is
the surviving entity), the holders of
 
                                      A-1
<PAGE>
   
Class A Common Stock shall be entitled to receive the same per share
consideration as the per share consideration, if any, received by any holder of
the Common Stock in such merger or consolidation.
    
 
    5.  VOTING.
 
   
        (a) Except as otherwise expressly provided with respect to any other
    class of stock and except as otherwise may be required by law or this
    certificate, the Common Stock shall have the exclusive right to vote for the
    election of directors and for all other purposes and each holder of Common
    Stock shall be entitled to one vote for each share of Common Stock held.
    Except as expressly provided in this certificate and except as otherwise
    required by law, the Class A Common Stock shall have no voting rights.
    
 
        (b) The Class A Common Stock shall be entitled to vote separately as a
    class only with respect to (i) proposals to change the par value of the
    Class A Common Stock, (ii) other amendments to this certificate that alter
    or change the powers, preferences or special rights of the Class A Common
    Stock so as to affect them adversely, and (iii) such other matters as may
    require class voting under the Delaware General Corporation Law.
 
   
        (c) The number of authorized shares of Class A Common Stock and Common
    Stock may be increased or decreased (but not below the number of shares then
    outstanding) by the affirmative vote of the holders of a majority of the
    outstanding shares of Common Stocks entitled to vote.
    
 
   
    6.  STOCK SPLITS. The Corporation may not split, divide or combine the
shares of either class of Common Stocks unless, at the same time, the
Corporation splits, divides or combines, as the case may be, the shares of the
other class of Common Stocks in the same proportion and manner.
    
 
    7.  NO PRE-EMPTIVE RIGHTS. No stockholder of this Corporation shall by
reason of his holding shares of any class have any pre-emptive or preferential
right to purchase or subscribe to any shares of any class of this Corporation,
now or hereafter to be authorized, or any notes, debentures, bonds, or other
securities convertible into or carrying options or warrants to purchase shares
of any class, now or hereafter to be authorized, whether or not the issuance of
any such shares, or such notes, debentures, bonds or other securities, would
adversely affect the dividends or voting rights of such stockholder, other than
such rights, if any, as the Board of Directors, in its discretion from time to
time may grant and at such price as the Board of Directors in its discretion may
fix; and the Board of Directors may issue shares of any class of this
Corporation, or any notes, debentures, bonds, or other securities convertible
into or carrying options or warrants to purchase shares of any class, without
offering any such shares of any class, either in whole or in part, to the
existing stockholders of any class.
 
   
    8.  ISSUANCES AND REPURCHASES OF COMMON STOCKS.
    
 
   
        (a) The Board of Directors shall have the power to issue and sell all or
    any part of any class of stock herein or hereafter authorized to such
    persons, firms, associations or corporations and for such consideration as
    the Board of Directors shall from time to time, in its discretion,
    determine, whether or not greater consideration could be received upon the
    issue or sale of the same number of shares of another class, and as
    otherwise permitted by law.
    
 
        (b) The Board of Directors shall have the power to purchase any class of
    stock herein or hereafter authorized from such persons, firms, associations
    or corporations for such consideration as the Board of Directors shall from
    time to time, in its discretion, determine, whether or not less
 
                                      A-2
<PAGE>
    consideration could be paid upon the purchase of the same number of shares
    of another class, and as otherwise permitted by law.
 
        (c) For purposes of this subsection 8 of this Article Fourth, the term
    "persons" means a natural person, company, government, or any political
    subdivision, agency or instrumentality of a government, or other entity.
 
    9.  CLASS A PROTECTION PROVISIONS.
 
   
        (a) If, after the time that this Section 9 of Article Fourth becomes
    effective (the "Effective Time"), a Person or group, each as defined in
    Section 9(j) of this Article Fourth, acquires beneficial ownership of shares
    representing 15% or more of the number of then outstanding shares of Common
    Stock and such Person or group (a "Significant Stockholder") does not then
    beneficially own an equal or greater percentage of all then outstanding
    shares of the Class A Common Stock, all of which Class A Common Stock must
    have been acquired by such Significant Stockholder after the Effective Time,
    such Significant Stockholder must, within a ninety (90) day period beginning
    the day after becoming a Significant Stockholder, make a public cash tender
    offer in compliance with all applicable laws and regulations to acquire
    additional shares of Class A Common Stock as provided in this Section 9 of
    Article Fourth (a "Class A Protection Transaction").
    
 
   
        (b) In each Class A Protection Transaction, the Significant Stockholder
    must make a public tender offer to acquire that number of additional shares
    of Class A Common Stock determined by (i) multiplying the percentage of the
    number of outstanding shares of Common Stock beneficially owned and acquired
    after the Effective Time by such Significant Stockholder by the total number
    of shares of Class A Common Stock outstanding on the date such Person or
    group became a Significant Stockholder, and (ii) subtracting therefrom the
    number of shares of Class A Common Stock beneficially owned by such
    Significant Stockholder on the date such Person or group became a
    Significant Stockholder which were acquired after the Effective Time (as
    adjusted for stock splits, stock dividends and similar events). The
    Significant Stockholder must acquire all shares validly tendered; or if the
    number of shares of Class A Common Stock tendered to the Significant
    Stockholder exceeds the number of shares required to be acquired pursuant to
    this Section 9(b), the number of shares of Class A Common Stock acquired
    from each tendering holder shall be pro rata based on the percentage that
    the number of shares tendered by such stockholder bears to the total number
    of shares tendered by all tendering holders.
    
 
   
        (c) The offer price for any Class A Common Stock required to be
    purchased by the Significant Stockholder pursuant to Section 9 of this
    Article Fourth shall be the greatest of (i) the highest price per share paid
    by the Significant Stockholder for any Common Stock or Class A Common Stock
    during the six month period ending on the date such Person or group became a
    Significant Stockholder (or such shorter period if the date such Person or
    group became a Significant Stockholder is not more than six months following
    the Effective Time), (ii) the highest reported sale price of Common Stock or
    Class A Common Stock on the National Association of Securities Dealers
    Automated Quotation System--National Market System ("NASDAQ/NMS") during the
    last five days that the Corporation's shares were traded prior to the
    Effective Time (or such other securities exchange or quotation system as is
    then the principal trading market for such shares) during the 30 day period
    preceding such Person or group becoming a Significant Stockholder, and (iii)
    the highest reported sale price of Common Stock or Class A Common Stock on
    the NASDAQ/NMS (or such other securities exchange or quotation system as is
    then the principal trading market for such shares)
    
 
                                      A-3
<PAGE>
   
    on the business day preceding the date the Significant Stockholder makes the
    tender offer required by this Section 9 of this Article Fourth. For purposes
    of Section 9(d) of this Article Fourth, the applicable date for each
    calculation required by clauses (i) and (ii) of the preceding sentence shall
    be the date on which the Significant Stockholder becomes required to engage
    in the Class A Protection Transaction for which such calculation is
    required. In the event that the Significant Stockholder has acquired Common
    Stock or Class A Common Stock in the six month period ending on the date
    such Person or group becomes a Significant Stockholder for consideration
    other than cash, the value of such consideration per share of Common Stock
    shall be as determined in good faith by the Board of Directors.
    
 
   
        (d) A Class A Protection Transaction shall also be required to be
    effected by any Significant Stockholder each time that the Significant
    Stockholder acquires after the Effective Time beneficial ownership of
    additional Common Stock in an amount equal to or greater than the next
    higher multiple of 5% in excess of 15% (e.g., 20%, 25%, 30%, etc.) of the
    number of outstanding shares of Common Stock if such Significant Stockholder
    does not then own an equal or greater percentage of the Class A Common Stock
    (all of which Class A Common Stock must have been acquired by such
    Significant Stockholder after the Effective Time). Such Significant
    Stockholder shall be required to make a public cash tender offer to acquire
    that number of shares of Class A Common Stock prescribed by the formula set
    forth in Section 9(b) of this Article Fourth, and must acquire all shares
    validly tendered or a PRO RATA portion thereof, as specified in such Section
    9(b), at the price determined pursuant to Section 9(c) of this Article
    Fourth, even if a previous Class A Protection Transaction resulted in fewer
    shares of Class A Common Stock being tendered than the Significant
    Stockholder was required to offer to purchase in the previous offer.
    
 
   
        (e) If any Significant Stockholder fails to make an offer required by
    this Section 9 of this Article Fourth, or to purchase shares validly
    tendered and not withdrawn (after proration, if any), such Significant
    Stockholder shall not be entitled to vote any Common Stock beneficially
    owned by such Significant Stockholder and acquired by such Significant
    Stockholder after the Effective Time unless and until such requirements are
    complied with or unless and until all shares of Common Stock causing such
    offer requirement to be effective are no longer beneficially owned by such
    Significant Stockholder. To the extent that the voting power of any shares
    of Common Stock is so suspended, such shares shall not be included in the
    determination of aggregate voting shares for any purpose under this Amended
    Restated Certificate of Incorporation or the Delaware General Corporation
    Law. The requirement to engage in a Class A Protection Transaction is
    satisfied by the making of the requisite offer and purchasing validly
    tendered shares pursuant to this Section 9 of this Article Fourth, even if
    the number of shares tendered is less than the number of shares the
    Significant Stockholder was required to offer to purchase.
    
 
   
        (f) The Class A Protection Transaction requirement shall not apply to
    any increase in percentage beneficial ownership of Common Stock resulting
    solely from a change in the aggregate amount of Common Stock outstanding,
    provided that any acquisition after such change which resulted in any Person
    or group beneficially owning fifteen percent (15%) or more of the number of
    outstanding shares of Common Stock (or an additional 5% or more of the
    number of shares of the Common Stock after the last acquisition which
    triggered the requirement for a Class A Protection Transaction) shall be
    subject to any Class A Protection Transaction requirement that would be
    imposed pursuant to this Section 9 of this Article Fourth.
    
 
                                      A-4
<PAGE>
   
        (g) In connection with Sections 9(a) through 9(d) of this Article
    Fourth, the following shares of Common Stock shall be excluded for the
    purpose of determining the shares of Common Stock beneficially owned by such
    Person or group but not for the purpose of determining shares outstanding:
    
 
            (i) shares beneficially owned by such Person or group at the
       Effective Time;
 
            (ii) shares acquired by will or by the laws of descent and
       distribution, or by gift that is made in good faith and not for the
       purpose of circumventing this Section 9 of Article Fourth or by
       foreclosure of a bona fide loan;
 
           (iii) shares acquired upon issuance or sale by the Corporation,
       including shares issued by the Corporation in a merger or consolidation
       involving the Corporation or a subsidiary;
 
            (iv) shares acquired by operation of law (including a merger or
       consolidation effected for the purpose of recapitalizing such Person or
       reincorporating such Person in another jurisdiction but excluding a
       merger or consolidation effected by such Person for the purpose of
       acquiring another Person);
 
   
            (v) shares acquired in exchange for Class A Common Stock by a holder
       of Class A Common Stock (or by a parent, lineal descendant or donee of
       such holder of Class A Common Stock who received such Class A Common
       Stock from such holder) if the Class A Common Stock so exchanged were
       acquired by such holder directly from the Corporation as a result of a
       stock split or as a dividend on Common Stock; and
    
 
            (vi) shares acquired by a plan of the Corporation qualified under
       Section 401(a) of the Internal Revenue Code of 1986, as amended, or any
       successor provision thereto, or acquired by reason of a distribution from
       such a plan.
 
        (h) In connection with Sections 9(a) through 9(b) of this Article
    Fourth, for purposes of calculating the number of shares of Class A Common
    Stock beneficially owned by any Persons or group:
 
            (i) Class A Common Stock acquired by gift shall be deemed to be
       beneficially owned by such Person or member of a group if such gift was
       made in good faith and not for the purpose of circumventing the operation
       of this Section 9 of this Article Fourth; and
 
            (ii) only Class A Common Stock owned of record by such Person or
       member of a group or held by others as nominees of such Person or member
       of a group and identified as such to the Corporation shall be deemed to
       be beneficially owned by such Person or group (provided that Class A
       Common Stock with respect to which such Person or member of a group has
       sole investment and voting power shall be deemed to be beneficially owned
       thereby).
 
   
        (i) All calculations with respect to percentage beneficial ownership of
    either issued and outstanding Common Stock or Class A Common Stock will be
    based upon the numbers of issued and outstanding shares reflected in either
    the records of or a certification from the Corporation's stock transfer
    agent or reported by the Corporation on the last to be filed of (i) the
    Corporation's most recent Annual Report on Form 10-K, (ii) its most recent
    Quarterly Report on Form 10-Q, (iii) its most recent Current Report on Form
    8-K, and (iv) its most recent definitive proxy statement filed with the
    Securities and Exchange Commission.
    
 
                                      A-5
<PAGE>
        (j) For purposes of this Section 9 of this Article Fourth, the term
    "Person" means any individual, partnership, corporation, association, trust,
    or other entity (other than the Corporation). Subject to Sections 9(g) and
    9(h) of this Article Fourth, "beneficial ownership" shall be determined
    pursuant to Rule 13d-3 promulgated under the Securities Exchange Act of
    1934, as amended (the "1934 Act"), or any successor regulation and the
    formation or existence of a "group" shall be determined pursuant to Rule
    13d-5(b) under the 1934 Act or any successor regulation, subject to the
    following qualifications:
 
            (i) relationships by blood or marriage between or among any Persons
       will not constitute any of such Persons as a member of a group with such
       other Person, absent affirmative attributes of concerted action; and
 
            (ii) any Person acting in his official capacity as a director or
       officer of the Corporation shall not be deemed to beneficially own shares
       where such ownership exists solely by virtue of such Person's status as a
       trustee (or similar position) with respect to shares held by plans or
       trusts for the general benefit of employees or former employees of the
       Corporation, and actions taken or agreed to be taken by a Person in such
       Person's official capacity as an officer or director of the Corporation
       will not cause such Person to become a member of a group with any other
       Person.
 
   
    10. ADDITIONAL VOTING RIGHTS OF CLASS A COMMON STOCK. Each share of Class A
Common Stock (whether or not then issued) shall be entitled to vote on all
matters presented to the stockholders of the Corporation (i) automatically at
the time the number of outstanding shares of Common Stock is less than 10% of
the aggregate number of outstanding shares of Common Stock and Class A Common
Stock; or (ii) upon resolution of the Board of Directors, if as a result of the
existence of the Class A Common Stock, either the Common Stock or Class A Common
Stock or both are, or will be, excluded from quotation on NASDAQ/NMS and other
comparable quotation systems then in use and are also, or will be, excluded from
trading on the New York Stock Exchange, the American Stock Exchange and all
other principal national securities exchanges then in use. The Board of
Directors shall have the power to determine whether the conditions set forth in
clauses (i) or (ii) above have occurred. In making its determination, the Board
of Directors may conclusively rely on information and documentation available to
it, including but not limited to, information or certification from its stock
transfer agent, filings made with the Securities and Exchange Commission, any
stock exchange, the National Association of Securities Dealers, Inc., or any
other national quotation system. The determination of the Board of Directors
that the conditions described in either (i) or (ii) have occurred shall be
conclusive and binding and the acquisition of voting rights by each share of
Class A Common Stock shall remain effective regardless of whether the conditions
described in (i) or (ii) have occurred in fact.
    
 
                                      A-6
<PAGE>


                                 PROXY

                             HACH COMPANY

             SPECIAL MEETING OF SHAREHOLDERS -- JULY 23, 1997
        THIS PROXY IS SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS

     The undersigned hereby appoint(s) KATHRYN HACH-DARROW, BRUCE J. HACH and 
ROBERT O. CASE, and each of them, each with the power of substitution, as 
proxies and agents ("Proxy Agents"), in the name of the undersigned to 
represent and to vote as designated below all of the shares of Common Stock 
of HACH COMPANY (the "Company"), held of record by the undersigned on 
Thursday, June 12, 1997, at the Special Meeting of Stockholders to be held 
on Wednesday, July 23, 1997, and any adjournment(s) thereof, the undersigned 
herewith ratifying all that the said Proxy Agents may so do. The undersigned 
further acknowledges receipt of the Notice of Special Meeting and the Proxy 
Statement in support of the Board's solicitation of proxies dated June 16, 
1997.


     THIS PROXY, WHEN PROPERLY EXECUTED AND RETURNED TO THE COMPANY, WILL BE 
VOTED IN THE MANNER DIRECTED HEREIN BY THE UNDERSIGNED STOCKHOLDER(S). IF NO 
DIRECTION IS MADE, THIS PROXY WILL BE VOTED FOR THE APPROVAL OF THE 
AMENDMENT TO ARTICLE FOURTH OF THE COMPANY'S RESTATED CERTIFICATE OF 
INCORPORATION IN THE FORM ATTACHED AS EXHIBIT A TO THE PROXY STATEMENT.

                                                 (continued on reverse side)

<PAGE>

    PLEASE MARK VOTE IN OVAL IN THE FOLLOWING MANNER USING DARK INK ONLY  /X/


1. PROPOSAL TO APPROVE THE AMENDMENT OF ARTICLE FOURTH   For   Against   Abstain
   OF THE COMPANY'S RESTATED CERTIFICATE OF              / /     / /       / /
   INCORPORATION IN THE FORM ATTACHED AS EXHIBIT A 
   TO THE PROXY STATEMENT.


2. In their discretion, the Proxy Agents are authorized to vote upon
   such other business as may properly come before the meeting.


Dated: ________________________________, 1997


Signature _____________________________________________


Signature _____________________________________________



PLEASE DATE AND SIGN exactly as name(s) appears hereon and return
promptly in the accompanying prepaid envelope. If shares are held by joint
tenants or as community property, both shareholders should sign.




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