HYCOR BIOMEDICAL INC /DE/
10-Q, 1997-11-14
IN VITRO & IN VIVO DIAGNOSTIC SUBSTANCES
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<PAGE>   1

                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D. C. 20549

                                    FORM 10-Q

(MARK ONE)

[X]      QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
         EXCHANGE ACT OF 1934

         FOR THE QUARTERLY PERIOD ENDED: SEPTEMBER 30, 1997

[ ]      TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
         EXCHANGE ACT OF 1934

         FOR THE TRANSITION PERIOD FROM                     TO
                                        -------------------    -----------------

                         Commission File Number: 0-11647

                              HYCOR BIOMEDICAL INC.
                              ---------------------
             (Exact name of registrant as specified in its charter)

          Delaware                                              58-1437178
- -------------------------------                             ------------------
(State or other jurisdiction of                             (I. R. S. Employer
incorporation or organization)                              Identification No.)

             18800 Von Karman Avenue, Irvine, California 92612-1517
             ------------------------------------------------------
               (Address of principal executive offices) (Zip Code)

Registrant's telephone number, including area code (714) 440-2000
                                                   --------------

      Indicate by check mark whether the registrant (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Exchange Act of
1934 during the preceding 12 months (or for such shorter period that the
registrant was required to file such reports), and (2) has been subject to such
filing requirements for the past 90 days. Yes [X] No [ ]

      Indicate the number of shares outstanding of each of the issuer's classes
of common stock, as of the latest practicable date.

            Class                               Outstanding at October 31, 1997
- ----------------------------                    --------------------------------
Common Stock, $.01 Par Value                                7,131,467

<PAGE>   2

PART I.  FINANCIAL INFORMATION

ITEM I.  FINANCIAL STATEMENTS

                     HYCOR BIOMEDICAL INC. AND SUBSIDIARIES
                           CONSOLIDATED BALANCE SHEETS

<TABLE>
<CAPTION>
                                                              September 30,        December 31,
ASSETS                                                            1997                 1996
                                                              -------------        ------------
CURRENT ASSETS:                                                (unaudited)
<S>                                                           <C>                  <C>         
  Cash and cash equivalents                                   $    662,565         $    631,404
  Investments                                                    2,009,066            4,732,585
  Accounts receivable, net of allowance for
   doubtful accounts of $76,934 and $101,191                     3,057,000            3,028,689
  Income tax receivable                                            527,989              409,242
  Inventories (Note 2)                                           4,306,588            3,922,543
  Prepaid expenses and other current assets                        535,768              602,533
  Deferred income tax benefit                                      881,570              491,000
                                                              ------------         ------------
      Total current assets                                      11,980,546           13,817,996
                                                              ------------         ------------
PROPERTY AND EQUIPMENT, at cost                                 12,543,636           11,437,612
  Less accumulated depreciation                                 (7,397,883)          (6,529,718)
                                                              ------------         ------------
                                                                 5,145,753            4,907,894
                                                              ------------         ------------
GOODWILL AND OTHER INTANGIBLES, net of
  amortization of $1,035,509 and $870,110 (Note 3)               4,377,614            4,368,658
DEFERRED INCOME TAX BENEFIT                                        854,162              854,000
OTHER ASSETS                                                       180,061              329,373
                                                              ------------         ------------
      Total assets                                            $ 22,538,136         $ 24,277,921
                                                              ============         ============

LIABILITIES AND STOCKHOLDERS' EQUITY

CURRENT LIABILITIES:
  Accounts payable                                            $    990,634         $  1,053,400
  Accrued liabilities                                              691,549              726,474
  Accrued payroll expenses                                         674,484              580,089
  Current portion - long-term debt (Notes 3 & 4)                   753,164                   --
                                                              ------------         ------------
      Total current liabilites                                   3,109,831            2,359,963
                                                              ------------         ------------
Long-Term Debt (Notes 3 & 4)                                     2,158,427                   --
                                                              ------------         ------------
Total Liabilities                                                5,268,258            2,359,963
                                                              ------------         ------------

STOCKHOLDERS' EQUITY:
  Common stock                                                      71,219               72,181
  Paid-in capital                                               12,212,177           12,605,636
  Retained earnings                                              5,423,867            9,232,541
  Accumulated foreign currency translation adjustments            (439,747)              31,275
  Unrealized losses on investments, net of tax benefit               2,362              (23,675)
                                                              ------------         ------------
      Total stockholders' equity                                17,269,878           21,917,958
                                                              ------------         ------------

      Total liabilities and stockholders' equity              $ 22,538,136         $ 24,277,921
                                                              ============         ============
</TABLE>


                                     Page 2

<PAGE>   3

                     HYCOR BIOMEDICAL INC. AND SUBSIDIARIES
                        CONSOLIDATED STATEMENTS OF INCOME
                                   (unaudited)

<TABLE>
<CAPTION>
                                                                 Three Months Ended                  Nine Months Ended
                                                                    September 30,                       September 30,
                                                            -----------------------------      ------------------------------
                                                                1997              1996              1997              1996
                                                            -----------      ------------      ------------      ------------
<S>                                                         <C>              <C>               <C>               <C>         
NET SALES                                                   $ 4,679,354      $  4,736,927      $ 14,126,566      $ 15,215,194
COST OF SALES                                                 2,207,826         2,254,307         6,484,235         6,866,042
                                                            -----------      ------------      ------------      ------------
      Gross profit                                            2,471,528         2,482,620         7,642,331         8,349,152
                                                            -----------      ------------      ------------      ------------
OPERATING EXPENSES
  Selling, general and administrative                         2,263,600         2,096,017         6,538,894         6,602,541
  Research and development                                      775,042           734,118         2,112,540         2,080,032
  Acquired in-process research and development (Note 3)       3,300,000                --         3,300,000                --
                                                            -----------      ------------      ------------      ------------
                                                              6,338,642         2,830,135        11,951,434         8,682,573
                                                            -----------      ------------      ------------      ------------
OPERATING INCOME (LOSS)                                      (3,867,114)         (347,515)       (4,309,103)         (333,421)


INTEREST EXPENSE (Note 4)                                        38,311                --            38,472                --
INTEREST INCOME                                                  51,103            93,141           195,406           310,476
FOREIGN EXCHANGE G/(L)                                           (4,326)           12,622            (6,324)           24,296
                                                            -----------      ------------      ------------      ------------
INCOME (LOSS) BEFORE PROVISION
  (BENEFIT) FOR INCOME TAXES                                 (3,858,648)         (241,752)       (4,158,493)            1,351

PROVISION (BENEFIT) FOR INCOME TAXES                           (247,342)         (110,696)         (349,818)          (14,020)
                                                            -----------      ------------      ------------      ------------
NET INCOME (LOSS)                                           $(3,611,306)     $   (131,056)     $ (3,808,675)     $     15,371
                                                            ===========      ============      ============      ============

NET INCOME (LOSS) PER SHARE                                 $     (0.50)     $      (0.02)     $      (0.53)     $        0.0
                                                            ===========      ============      ============      ============

AVE. COMMON SHARES OUTSTANDING                                7,148,077         7,698,527         7,169,388         7,817,794
</TABLE>



                                     Page 3

<PAGE>   4

                     HYCOR BIOMEDICAL INC. AND SUBSIDIARIES
                      CONSOLIDATED STATEMENTS OF CASH FLOWS
                                   (unaudited)

<TABLE>
<CAPTION>
                                                                                 Nine Months Ended
                                                                                   September 30,
                                                                                1997             1996
CASH FLOWS FROM OPERATING ACTIVITIES:                                       ------------     -----------
<S>                                                                         <C>              <C>        
  Net income (loss)                                                         $(3,808,675)     $    15,371
  Adjustments to reconcile net income to net cash provided by 
   operating activities:
    Depreciation and amortization                                             1,209,702        1,417,804
    Deferred income tax provision                                              (273,829)        (205,654)
    (Gain) Loss on foreign currency transactions                                  6,324          (24,296)
    (Gain) Loss on sale of assets                                                68,950           (1,024)
    Acquired In-Process R&D                                                   3,300,000               --
    Change in assets and liabilities, net of effects of
     foreign currency adjustments
      Accounts receivable                                                       434,521          596,040
      Income tax receivable                                                    (120,199)         101,591
      Inventories                                                              (255,882)        (242,571)
      Prepaid expenses and other current assets                                 416,031          255,441
      Accounts payable                                                         (759,411)        (133,525)
      Accrued liabilities                                                      (631,181)        (651,751)
      Accrued payroll expenses                                                   88,787         (415,319)
                                                                            -----------      -----------
          Total adjustments                                                   3,483,813          696,736
                                                                            -----------      -----------
    Net cash provided by (used in) operating activities                        (324,862)         712,107
                                                                            -----------      -----------
CASH FLOWS FROM INVESTING ACTIVITIES:
  Proceeds from sales of investments                                          2,689,537        1,044,298
  Purchases of intangible assets                                               (187,656)          (8,799)
  Purchases of property, plant and equipment                                 (1,311,709)      (1,134,651)
  Business acquisitions, net of cash acquired                                (3,386,169)              --
  Direct costs of acquisition                                                  (224,646)              --
  Proceeds from sale of property and equipment                                   60,453               --
  Proceeds from collection of notes receivable                                  179,667           20,133
                                                                            -----------      -----------
    Net cash provided by (used in) investing activities                      (2,180,523)         (79,019)
                                                                            -----------      -----------
CASH FLOWS FROM FINANCING ACTIVITIES:
  Proceeds from issuance of long-term debt                                    2,813,821               --
  Principal payments on long-term debt                                           (7,648)              --
  Proceeds from issuance of common stock                                         73,159          130,204
  Purchases of Hycor common stock                                              (467,580)      (1,666,273)
                                                                            -----------      -----------
    Net cash provided by (used in) financing  activities                      2,411,752       (1,536,069)
                                                                            -----------      -----------
EFFECT OF EXCHANGE RATE CHANGES ON CASH                                         124,794            7,755

INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS                                 31,161         (895,226)

CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD                                  631,404        1,033,459
                                                                            -----------      -----------
CASH AND CASH EQUIVALENTS, END OF PERIOD                                    $   662,565      $   138,233
                                                                            ===========      ===========
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
  Cash paid during the year - interest                                           17,927               --
                            - income taxes                                  $    58,553      $   239,103
</TABLE>

                                     Page 4

<PAGE>   5

                     HYCOR BIOMEDICAL INC. AND SUBSIDIARIES
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                               SEPTEMBER 30, 1997

1.    BASIS OF PRESENTATION

            In the opinion of the Company, the accompanying unaudited financial
      statements include all adjustments necessary to present fairly the
      financial position as of September 30, 1997 and December 31, 1996, the
      results of operations and the cash flows for the three and nine-month
      periods ended September 30, 1997 and 1996.

            These statements have been prepared pursuant to the rules and
      regulations of the Securities and Exchange Commission and do not include
      all the information and note disclosures required by generally accepted
      accounting principles for complete financial statements and may be subject
      to year-end adjustments.

            The consolidated financial statements should be read in conjunction
      with the consolidated financial statements and notes thereto included in
      the Company's 1996 annual report on Form 10-K as filed with the Securities
      and Exchange Commission. Certain items in the 1996 consolidated financial
      statements have been reclassified to conform with the 1997 presentation.

            The results of operations for any interim period are not necessarily
      indicative of results to be expected for the full year.

            Net income per share is based upon the weighted average number of
      shares outstanding during the periods plus common stock equivalents
      relating to warrants and options. The number of common stock equivalents
      relating to options and warrants is determined using the treasury stock
      method. Common stock equivalents are not included when their effect is
      antidilutive. Fully diluted net income per share approximates primary net
      income per share in each period.

            In December 1997, the Company will be required to adopt Statement of
      Financial Accounting Standard No. 128, "Earnings per share." The
      provisions of this statement will require a change in the method of
      calculating earnings per share which will result in an insignificant
      difference from currently reported earnings per share.

                                     Page 5
<PAGE>   6

2.    INVENTORIES

            Inventories are valued at the lower of cost (first-in, first-out
      method) or market. Cost includes material, direct labor and manufacturing
      overhead. Inventories at September 30, 1997 and December 31, 1996 consist
      of:

<TABLE>
<CAPTION>
                                                             9/30/97           12/31/96
                                                             -------           --------
<S>                                                       <C>               <C>        
                   Raw materials                          $1,038,928         $  870,887
                   Work in process                         1,533,692          1,216,066
                   Finished goods                          1,733,968          1,835,590
                                                          ----------         ----------
                                                          $4,306,588         $3,922,543
                                                          ==========         ==========
</TABLE>

3.    ACQUISITION

            On July 21, 1997, the Company acquired from unrelated third parties
      all of the outstanding stock of Cogent Diagnostics Limited ("Cogent") for
      approximately $1,453,000 in cash and $1,574,000 in three year notes to the
      seller group which are secured by individual Shares Pledge agreements
      wherein an aggregate of 85,499 shares of Cogent stock are pledged as
      security for the debt. The shares pledged as security against the three
      year notes represent approximately 95% of the total outstanding shares of
      Cogent. The cash portion of the Cogent acquisition was partially financed
      through bank borrowings of $1,000,000. The Company also incurred direct
      costs of approximately $220,000 related to the acquisition.

            The Company obtained an independent valuation of the net assets
      acquired in the purchase transaction which resulted in the allocation of
      the purchase price to $254,000 of identified assets, $3,300,000 of
      acquired in-process research and development, and $148,000 of goodwill.
      The purchase price allocated to in-process research and development was
      charged to the Company's current operations. The portion of the purchase
      price allocated to goodwill is being amortized over 20 years on a straight
      line basis.

            The acquisition was accounted for using the purchase method of
      accounting, and Cogent's operating results have been included in the
      accompanying consolidated statements of operations from the date of
      acquisition. Cogent is based in Edinburgh, Scotland and develops,
      manufactures and markets a broad line of test kits for diagnosis of
      autoimmune disease.

4.    LONG TERM DEBT

            In July 1997,the Company entered into a business loan agreement
      ("Agreement") with Tokai Bank establishing a two year secured line of
      credit of $2,000,000. The Agreement provides that the Company can borrow
      at a predetermined spread over the London Inter-Bank Offered Rate (LIBOR).
      The primary purpose of the Agreement was to provide financing for the
      Cogent acquisition and related costs.



                                     Page 6
<PAGE>   7

ITEM 2.  MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND
         RESULTS OF OPERATIONS

      Except for historical information contained herein, the matters discussed
in this report are forward-looking statements which involve risk and
uncertainties, including but not limited to economic, competitive, governmental
and technological factors affecting the Company's operations, markets, products,
services and prices and other factors discussed in the Company's filings with
the Securities and Exchange Commission.

      On September 30, 1996, the Company formed Hycor Biomedical SAS ("Hycor
SAS") as a wholly owned subsidiary. Located in Paris, France, Hycor SAS will
market allergy diagnostic products in France. Hycor SAS commenced direct
commercial activities during the quarter ended September 30, 1997. Pre-tax
losses, including start-up costs, for the quarter for this subsidiary were
approximately $138,000.

      On July 21, 1997, the Company acquired from unrelated third parties all of
the outstanding stock of Cogent Diagnostics Limited ("Cogent"). Cogent is based
in Edinburgh, Scotland. Cogent develops, manufactures and markets a broad line
of test kits for diagnosis of autoimmune disease. Cogent sales for its most
recent fiscal year were approximately $1,400,000.

      The Company has adequate working capital and sources of capital to carry
on its current business and to meet its existing capital requirements. The
Company decreased its working capital $2,587,318 as of September 30, 1997,
compared to December 31, 1996. This decrease was primarily a result of the
increased investment in PP&E, predominately related to the placement of
HY-TEC(TM) Instruments ($1,312,000), the Company's stock repurchase program
($468,000), and the acquisition of Cogent. In July 1997, the Company entered
into a business loan agreement ("Agreement") with Tokai Bank establishing a two
year secured line of credit of $2,000,0000. The agreement provides that the
Company can borrow at a predetermined spread over the London Inter-Bank Offered
Rate (LIBOR). The primary purpose of the agreement was to provide financing for
the Cogent acquisition and related costs. As of September 30, 1997, there was $1
million outstanding.

      During the three and nine-month periods ended September 30, 1997, sales
decreased 1% and 7%, respectively, compared to the same periods last year.
Revenue declines were due primarily to the loss of sales resulting from the 1995
Restructuring Plan and the related discontinued product lines. Revenues in 1996
from discontinued products were $606,000 for the quarter and $2,265,000 for the
nine-month period. In addition, in periods when the U.S. dollar is
strengthening, the effect of the translation of the financial statements of the
consolidated foreign affiliates is that of lower sales, cost, and net income.
The stronger U.S. dollar in the third quarter 1997 and the nine months 1997 when
compared to the corresponding 1996 periods resulted in lower reported sales of
approximately 3% in both periods.


                                     Page 7
<PAGE>   8

      Gross profit as a percentage of product sales increased for the quarter
from approximately 52% to 53% and decreased from approximately 55% to 54% for
the same period year-to-date due primarily to the addition of Cogent offset by
the impact of the strengthening U.S. dollar.

      Selling, general and administrative expenses have increased approximately
8% for the quarter and decreased approximately 1% for the same period
year-to-date. The cost increases for the quarter are primarily due to the
inclusion in 1997 third quarter results of both Cogent and Hycor SAS. The
decrease in the year-to-date period is primarily due to reduced expense levels
at the Company's German subsidiary resulting from the completion, in 1996, of
certain contractual obligations arising from the acquisition.

      Research and development costs for the three and nine-month periods ended
September 30, 1997 have increased approximately 6% and 2%, respectively,
compared to the same periods last year. This increase is due primarily to the
inclusion of Cogent in 1997 results.

PART II.   OTHER INFORMATION

ITEM 6.   EXHIBITS AND REPORTS ON FORM 8-K

          (a) Exhibits: 
        
              Material Contracts Relating to Management Compensation Plans or
              Arrangements:

                Exhibit 10.1        Employment Agreement of Richard D. Hamill

                Exhibit 10.2        Employment Agreement of Mary J. Deal

                Exhibit 10.3        Employment Agreement of Reginald P. Jones

                Exhibit 10.4        Employment Agreement of Thomas M. Li

                Exhibit 10.5        Employment Agreement of Nelson F. Thune

                Exhibit 27          Financial Data Schedule

          (b) Reports on Form 8K:   None


                                    SIGNATURE
                                    ---------

      Pursuant to the requirements of the Securities Exchange Act of 1934, the
registrant has duly caused this report to be signed on its behalf by the
undersigned thereunto duly authorized.

                                         HYCOR BIOMEDICAL INC.
                                         ---------------------


Date:  November 14, 1997                 By: /s/ Armando Correa
                                             -----------------------------------
                                             Armando Correa, Director of Finance

                                             (Mr. Correa is the Principal
                                             Accounting Officer and has been
                                             duly authorized to sign on behalf
                                             of the registrant.)


                                     Page 8
<PAGE>   9

<TABLE>
<CAPTION>
Exhibit List
- ------------
Exhibit No.                              Name of Exhibit                          Page Number
- -----------                              ---------------                          -----------
<C>                        <S>                                                        <C>   
10.1                       Employment Agreement of Richard D. Hamill                   10-18

10.2                       Employment Agreement of Mary J. Deal                        19-26

10.3                       Employment Agreement of Reginald P. Jones                   27-34

10.4                       Employment Agreement of Thomas M. Li                        35-42

10.5                       Employment Agreement of Nelson F. Thune                     43-50

27                         Financial Data Schedule                                     51
</TABLE>

                                     Page 9

<PAGE>   1
                                                                EXHIBIT 10.1

                              EMPLOYMENT AGREEMENT
                              --------------------

                THIS EMPLOYMENT AGREEMENT ("Agreement") is made and entered into
by HYCOR BIOMEDICAL INC., a Delaware corporation ("Company"), and RICHARD D.
HAMILL ("Hamill").

               WHEREAS, the Company desires to employ Hamill in an executive
capacity, Hamill desires to accept such employment, and the parties desire to
memorialize the terms and conditions of their employment relationship,

               NOW, THEREFORE, in consideration of the promises and covenants
set forth in this Agreement and for other valuable consideration, the parties
agree as follows:

                  1. Employment: Hamill shall be employed as the President and
Chief Executive Officer of the Company, and shall faithfully and diligently
perform all duties and responsibilities required of such position or assigned by
the Board of Directors from time to time, including service on behalf of the
Company's subsidiary and affiliated companies and as a member of the Board of
Directors.

                  2. Term. This Agreement and Hamill's employment shall be for a
term of three (3) years commencing on June 20, 1997 and expiring on June 19,
2000, but shall be automatically renewed for successive one-year periods
thereafter unless either party gives written notice to the other party of
nonrenewal at least six (6) months in advance of the expiration date.

                  3. Compensation: In consideration for all services to be
performed under this Agreement, Hamill shall receive the following compensation:

                           A. Salary: Hamill shall be paid base salary at the
        rate of Two Hundred Fifty Thousand Dollars ($250,000) per year.
        Annually, the Board of Directors shall review Hamill's performance with
        a view toward increasing his salary.

                           B. Bonus: Hamill shall be entitled to participate in
        the Company's Annual Executive Incentive Plan and the Long Term
        Executive Incentive Plan, subject to all of the terms and conditions set
        forth in said plans, as amended from time to time, as long as such plans
        remain in effect, and to participate in any successor or similar
        incentive plan available to management personnel of comparable status
        with the Company or its affiliates. Nothing herein or in said plans
        shall constitute a guarantee of Hamill's employment by the Company, or a
        limitation on the Company's rights under this Agreement, or limitation
        on the Company's rights to amend or terminate any plan.

                           C. Employee Benefit Plans: Hamill shall be
        entitled to participate in all employee benefit plans, including group
        medical, dental, visual, and life insurance, pension, profit sharing,
        group and individual disability income, stock option, vacation, and
        other benefit plans, on terms commensurate with the benefits awarded
        management personnel of comparable status with the Company or any
        affiliate of the Company, but subject, on any termination, to Section
        4.E below.


                                    Page 10
<PAGE>   2

                           D. Expense Reimbursement: The Company shall reimburse
        Hamill for all reasonable expenses that he necessarily incurs in
        connection with his employment and for which he presents adequate
        documentation in accordance with Company policies in effect from time to
        time.

                           E. Life Insurance: In addition to any other insurance
        benefit, the Company shall maintain a term life insurance policy on
        Hamill's life in the amount of $700,000, with Hamill having the right to
        designate the beneficiary of such insurance.

                           F. Disability Supplement: In the event Hamill is
        disabled from performing his assigned duties for any period in excess of
        thirty (30) days, then in addition to all disability benefits provided
        by any other insurance policy or plan and without diminishing the amount
        of such benefits, the Company shall pay Hamill for up to twelve (12)
        months during the period in which he is disabled an additional amount
        equal to the difference between his base salary and other disability
        benefits Hamill is eligible to receive.

                           G. Automobile: The Company shall provide Hamill with
        a new full-sized automobile, together with all related maintenance and
        operating expenses, such automobile to be replaced with a new like-kind
        automobile every two years.

                  4. Termination: This Agreement and Hamill's employment are
subject to immediate termination at any time as follows:

                           A. Death: This Agreement shall terminate immediately
        upon Hamill's death, in which event the Company's only obligations shall
        be (i) to pay all compensation owing for services rendered by Hamill
        prior to the date of his death; (ii) to continue paying Hamill's base
        salary to his estate for a period of thirty (30) days after his death;
        and (iii) to make periodic recoverable advances to Hamill's estate
        equivalent to Hamill's base salary for ninety (90) days after said
        thirty (30) day period has lapsed, or until the proceeds from the life
        insurance policy on Hamill's life referred to in this Agreement become
        available, whichever occurs first, with such advances to be repaid when
        said insurance proceeds become available.

                           B. Disability: In the event that Hamill is disabled
        from performing his assigned duties under this Agreement due to illness
        or injury for a period in excess of one hundred eighty (180) days, the
        Company may place Hamill on an unpaid leave of absence for a period not
        to exceed six (6) months, in which case the Company's only obligation
        shall be (i) to continue Hamill's group medical and life insurance for
        the duration of the leave; (ii) to pay the bonus, if any, that Hamill
        would be entitled to under the terms of the bonus plans referred to in
        Section 3B of this Agreement; (iii) to allow Hamill to continue
        receiving benefits under the disability insurance and other employee
        benefit plans in effect at the time of his disability in accordance with
        the terms and conditions of such plans; and (iv) to pay a disability
        supplement in accordance with Section 3F of this Agreement. The granting
        of a leave of absence does not guarantee that Hamill will be returned to
        employment, and the 


                                    Page 11
<PAGE>   3

        Company reserves the right to replace Hamill or to take other action in
        his absence due to business necessity. If Hamill is certified to return
        to work before his leave of absence expires, and desires to do so, the
        following provisions shall apply: (i) the Company will attempt to return
        Hamill to his same or similar position, provided this does not result in
        undue hardship to the Company; and (ii) if the Company is unable to
        reinstate Hamill because his position has been filled, then as a special
        severance benefit, the Company shall pay a lump-sum severance payment
        equal to twenty (20) months of Hamill's base salary as in effect
        immediately prior to the commencement of Hamill's leave of absence. If
        Hamill is not certified to return to work before his leave of absence
        expires, or does not desire to return, his employment and this Agreement
        shall terminate upon the expiration of his leave of absence.

                           C. Termination For Cause: The Company may terminate
        this Agreement for cause immediately upon written notice to Hamill in
        the event Hamill (i) engages in any material misconduct, willful breach,
        or habitual neglect of his duties as an officer or director of the
        Company, or (ii) is finally convicted of a felony. In either event, the
        Company's sole obligation to Hamill in lieu of all claims for
        compensation or damages shall be to pay all compensation owing for
        services rendered by Hamill prior to the date of termination under this
        subsection.

                           D. Termination Without Cause: The Company in its sole
        discretion may terminate this Agreement without cause or prior warning
        immediately upon written notice to Hamill. For purposes of this Section
        4D, any failure to renew this Agreement and any resignation following a
        substantial reduction in Hamill's salary, duties or responsibilities
        shall constitute an involuntary termination without cause for the
        convenience of the Company. In the event of a termination under this
        Section 4D the Company shall pay all compensation owing for services
        rendered by Hamill prior to the date of termination, shall pay a
        lump-sum severance benefit equal to twenty (20) months of Hamill's base
        salary at the time of termination, and shall continue to provide Hamill
        at Company expense all medical, disability and insurance benefits
        available to him at the time of termination for a period of twenty (20)
        months after the termination or, if shorter, the maximum period allowed
        under the Company's policies as then in effect or under applicable law.
        As an additional severance payment, if the Company has in effect at the
        time of any termination without cause under this Section 4D any bonus or
        incentive plan which provides for awards in cash and is based on the
        Company's revenues or results of operations for a fiscal year or other
        period, Hamill shall be entitled to an amount equal to a pro rata award
        based on the portion of the fiscal year or other period for which he was
        employed. Such severance shall be payable at the same time, and computed
        on the same terms, as awards under the plan in question, except for
        periods of service. In addition, any termination under this Section 4D
        shall constitute a termination for the convenience of the Company and
        shall extend the post-termination exercise period for all stock options
        granted to Hamill under the Company's stock option and other benefit
        plans so that such options will be exercisable for the longer of three
        months following the date of termination or any longer period provided
        in such plan. Such payments and benefits shall not entitle Hamill to any
        other benefits or compensation program available to Company employees.


                                    Page 12
<PAGE>   4

                       E. Termination Following Change In Control: If either the
        Company elects to terminate Hamill without cause pursuant to Section
        4(D) within ninety (90) days before or twenty four (24) months after a
        change in control or Hamill elects to resign with good reason within
        twenty four (24) months after a change in control of the Company, then
        as a severance benefit and in lieu of all compensation or damages the
        Company shall (i) pay Hamill a lump sum equal to 299% of the average of
        the annual base salary plus bonuses paid to Hamill during each of the
        three years prior to the time of such termination or resignation, (ii)
        continue to provide Hamill at Company expense all medical, disability
        and insurance benefits available to him at the time of such termination
        or resignation for a period of twenty four (24) months after such
        termination or resignation, or, if shorter, the maximum period allowed
        under the Company's policies as then in effect or under applicable law,
        (iii) accelerate the vesting of all unvested stock options granted to
        Hamill under the Company's stock option or other benefit plans so that
        all such stock options will vest and be fully exercisable on the date of
        such termination or resignation, and (iv) extend the post-termination
        exercise period for all stock options granted to Hamill under the
        Company's stock option and other benefit plans so that all such stock
        options will be exercisable for the longer of three months after the
        date of such termination or resignation or any longer post-termination
        exercise period provided in such plan.

                       For purposes of this subsection, the term "change in
        control" shall mean any change in control that the Company would be
        required to report in response to Item 5(f) of Schedule 14A of
        Regulation 14A promulgated under the Securities Exchange Act of 1934, as
        amended (the "Exchange Act"). Without limiting the foregoing, a change
        in control shall also be deemed to have occurred if (i) any "person" as
        defined in Section 13(d) and 14(d) of the Exchange Act is or becomes,
        directly or indirectly, the "beneficial owner" as defined in Rule 13
        (d-3) under the Exchange Act of securities of the Company which
        represent 25% or more of the combined voting power of the Company's then
        outstanding securities; or (ii) during any period of two consecutive
        years, individuals who at the beginning of said two year period
        constituted the Board of Directors of the Company cease for any reason
        to constitute at least a majority of the Board unless the election or
        nomination of each new director was approved by a vote of at least
        two-thirds of the directors who were in office at the beginning of said
        two year period.

                       For purposes of this subsection, Hamill shall be deemed
        to have resigned "with good reason" if he does so following a change in
        control as a result of the Company having done any or all of the
        following without Hamill's express written consent: (i) assigned Hamill
        different duties or made changes in his reporting responsibilities,
        title, or office that are substantially inconsistent with Hamill's
        duties, responsibilities, titles, or offices immediately prior to the
        change in control; (ii) reduced Hamill's base salary from that in effect
        at the time of the change in control; (iii) failed to continue any bonus
        plan in substantially the same form as it existed prior to the change in
        control; (iv) required Hamill to be based more than fifty (50) miles
        from his present office location, except for required travel consistent
        with Hamill's present business travel obligations; (v) failed to
        continue any plan or program for compensation, employee benefits, stock
        purchase or ownership, life insurance, group medical, disability, or
        vacation in substantially the same form as immediately prior to the


                                    Page 13
<PAGE>   5

        change in control, or otherwise made any material reduction in Hamill's
        fringe benefits, or (vi) failed to obtain the assumption of this
        Agreement by any successor to the Company.

                           Hamill shall not be entitled to the benefits of this
        Section 4(E) if this Agreement and his employment are terminated
        pursuant to Section 4(A), (B) or (C). If Hamill institutes legal
        proceedings to enforce any provision of this Section 4E or any other
        provision of this Agreement providing rights or benefits after a change
        of control, he shall be entitled to recover from the Company all costs,
        fees and expenses of such proceeding if he is the prevailing party.

                           F. Company's Obligations Under This Agreement
        Exclusive: The benefits set forth in subsections A through E above
        (which benefits, in the event of termination pursuant to subsections A,
        C, D or E, include payment for services rendered prior to termination as
        provided in such subsection), as applicable, constitute the sole
        obligations of the Company to Hamill upon a termination and are in lieu
        of any damages or other compensation that Hamill may claim under other
        Company policies in connection with this Agreement. The benefits on
        termination in this Agreement are in substitution for any severance or
        termination benefits otherwise available under Company policies of
        general application. Hamill expressly acknowledges that certain Company
        benefit or incentive plans provide for vesting in, or award of, benefits
        based on employment on or through particular dates and that nothing in
        this Agreement entitles him to partial vesting or partial awards under
        such plans. Any payments under Section 4D relating to any incentive or
        bonus plan are expressly acknowledged to be benefits under this
        Agreement and not an interpretation or modification of any such plan.

                           G. Resignation As Officer and Director: In the event
        of any termination pursuant to this Section 4, Hamill shall be deemed to
        have resigned as an officer and director of the Company if he was
        serving in such capacity at the time of termination.

                  5. Confidentiality: Hamill acknowledges and agrees that he has
been and will continue to be entrusted with trade and proprietary information
regarding the products, processes, methods of manufacture and delivery,
know-how, designs, formula, work in progress, research and development, computer
software and data bases, copyrights, trademarks, patents, marketing techniques,
and future business plans, as well as customer lists and information concerning
the identity, needs, and desires of actual and potential customers of the
Company and its subsidiaries, joint venturers, partners, and other affiliated
persons and entities ("Confidential Information"), all of which derive
significant economic value from not being generally known to others outside the
Company.

                           A. During the entire term of his employment with the
        Company and for two years thereafter, Hamill shall not disclose or
        exploit any Confidential Information except for the sole benefit of the
        Company or with its express written consent.

                           B. During the entire term of his employment by the
        Company and for one year thereafter, Hamill shall not directly or
        indirectly solicit 



                                    Page 14
<PAGE>   6

        any actual or potential customer of the Company or its subsidiary and
        affiliated companies for any business that competes directly or
        indirectly with the Company, except for the sole benefit of the Company
        or with its express written consent.

                           C. During the entire term of his employment by the
        Company and for one year thereafter, Hamill shall not induce or attempt
        to induce any employee of the Company to leave the Company's employ
        except for the sole benefit of the Company or with its express written
        consent.

                           D. In the event any provision in this Section 5 is
        more restrictive than allowed by the law of any jurisdiction in which
        the Company seeks enforcement, such provision shall be deemed amended
        and shall then be fully enforceable to the extent permitted by such law.

                           E. Hamill acknowledges and agrees that any violation
        of this Section 5 would cause immediate irreparable damage to the
        Company, and that it would be extremely difficult or impossible to
        determine the amount of damage caused to the Company. Hamill therefore
        agrees that the Company's remedies at law are inadequate, and hereby
        consents to issuance of a temporary restraining order, preliminary and
        permanent injunction, and other appropriate relief to restrain any
        actual or threatened violation of this Section, without limiting any
        remedies the Company may have at law or in equity.

                  6. Inventions: Any and all patents, copyrights, trademarks,
inventions, discoveries, developments, or trade secrets developed or perfected
by Hamill during or as the result of his employment with the Company shall
constitute the sole and exclusive property of the Company. Hamill shall disclose
all such matters to the Company, assign all right, title and interest he may
have in them, and cooperate with the Company in obtaining and perfecting any
patent, copyright, trademark, or other legal protection. This Section 6 shall
not apply to any invention which qualifies fully under California Labor Code
Section 2870, a true copy of which is attached to this Agreement as Exhibit A.

                  7. Conflict Of Interest: During the term of this Agreement,
Hamill shall devote his time, ability, and attention to the business of the
Company, and shall not accept other employment or engage in any other outside
business activity which interferes with the performance of his duties and
responsibilities under this Agreement or which involves actual or potential
competition with the business of the Company, except with the express written
consent of the Board of Directors.

                  8. Employee Benefit Plans: All of the employee benefit plans
referred to or contemplated by this Agreement shall be governed solely by the
terms of the underlying plan documents and by applicable law. Nothing in this
Agreement shall impair the Company's right to amend, modify, replace and
terminate any and all such plans in its sole discretion as provided by law, or
to terminate this Agreement in accordance with its terms. This Agreement is for
the sole benefit of Hamill and the Company, and is not intended to create an
employee benefit plan or to modify the term of existing plans.


                                    Page 15
<PAGE>   7

                  9.   Parachute Limitation:
                       ---------------------

                       A. If the payments and benefits Hamill is entitled to
under this Agreement and all other contracts, arrangements, or programs upon a
change in control shall, in the aggregate, exceed the maximum amount that may be
paid to Hamill without triggering golden parachute penalties under Section 280G
and related provisions of the Internal Revenue Code, as determined in good faith
by the Company's independent auditors (the "280G Ceiling"), then the cash
amounts paid to Hamill shall be increased to the extent necessary to compensate
Hamill for all excise taxes resulting from exceeding the 280G Ceiling, and all
income and other taxes due on such increased amounts, until Hamill has received
all amounts he would have received if no excise taxes were due under the 280G
Ceiling.

                       B. Although the Company does not believe it possible
under the terms of this Agreement, if the payments and benefits Hamill would be
entitled to receive upon a termination would exceed the 280G Ceiling and there
has been no change in control, Hamill's benefits shall be cut back in the
priority order designated by Hamill or, if Hamill fails promptly to designate an
order, in the priority order designated by the Company, to an amount $1 less
than the 280G Ceiling. If an amount in excess of the limit set forth in this
Section is paid to Hamill and there has been no change in control, Hamill must
repay the excess amount to the Company upon demand. Hamill and the Company agree
reasonably to cooperate with each other in connection with any administrative or
judicial proceedings concerning the existence or amount of golden parachute
penalties with respect to payments or benefits Hamill receives.

                  10. Assignment: This Agreement may not be assigned by Hamill,
but may be assigned by the Company to any successor in interest to its business.
In the event the Company does not survive any merger, acquisition, or other
reorganization, it shall make a reasonable effort to obtain an assumption of
this Agreement by the surviving entity in such merger, acquisition, or other
reorganization, but the failure to obtain such assumption shall not prevent or
delay such merger, acquisition, or other reorganization or relieve the Company
of its other obligations under this Agreement. This Agreement shall bind and
inure to the benefit of the Company's successors and assigns, as well as
Hamill's heirs, executors, administrators, and legal representatives.

                  11. Notices: All notices required by this Agreement may be
delivered by first class mail at the following addresses:

        To the Company:               Hycor Biomedical Inc.
                                      18800 Von Karman Avenue
                                      Irvine, California 92715

               To Hamill:             Richard D. Hamill
                                      22686 Ledana
                                      Mission Viejo, California 92691

                  12. Amendment. This Agreement may be modified only by written
agreement signed by the party against whom any amendment is to be enforced.

                  13. Choice Of Law: This Agreement shall be governed by the
laws of the State of California.

                  14. Partial Invalidity: In the event any provision of this
Agreement is void or unenforceable, the remaining provisions shall continue in
full force and effect.


                                    Page 16
<PAGE>   8

                  15. Waiver: No waiver of any breach of this Agreement shall
constitute a waiver of any subsequent breach.

                  16. Complete Agreement: This Agreement contains the entire
agreement between the parties, and supersedes any and all prior and
contemporaneous oral and written agreements, including Hamill's previous
employment contracts, which shall have no further force and effect.

"Hamill"                                     "Company"

RICHARD D. HAMILL                            HYCOR BIOMEDICAL INC.

______________________________               By:______________________________
                                             Name:___________________________
Dated:________________________               Dated:___________________________


                                    Page 17
<PAGE>   9

                                    EXHIBIT A

                       CALIFORNIA LABOR CODE SECTION 2870

                   EMPLOYMENT AGREEMENTS; ASSIGNMENT OF RENTS

        (a) Any provision in an employment agreement which provides that an
employee shall assign, or offer to assign, any of his or her rights in an
invention to his or her employer shall not apply to an invention that the
employee developed entirely on his or her own time without using the employer's
equipment, supplies, facilities, or trade secret information except for those
inventions that either:

               (1) Relate at the time of conception or reduction to practice of
               the invention to the employer's business, or actual or
               demonstrably anticipated research or development of the employer;
               or

               (2) Result from any work performed by the employee for the
               employer.

(b) To the extent a provision in an employment agreement purports to require an
employee to assign an invention otherwise excluded from being required to be
assigned under subdivision (a), the provision is against the public policy of
this state and is unenforceable.


                                    Page 18

<PAGE>   1

                                                                    EXHIBIT 10.2

                              EMPLOYMENT AGREEMENT
                              --------------------

               THIS EMPLOYMENT AGREEMENT ("Agreement") is made and entered into
by HYCOR BIOMEDICAL INC., a Delaware corporation ("Company"), and MARY JO DEAL
("Deal").

               WHEREAS, the Company desires to employ Deal in an executive
capacity, Deal desires to accept such employment, and the parties desire to
memorialize the terms and conditions of their employment relationship,

               NOW, THEREFORE, in consideration of the promises and covenants
set forth in this Agreement and for other valuable consideration, the parties
agree as follows:

               1. Employment: Deal shall be employed as a Vice President of the
Company reporting to the President, and shall faithfully and diligently perform
all duties and responsibilities required of such position or assigned by the
President from time to time, including service on behalf of the Company's
subsidiary and affiliated companies.

               2. Term. This Agreement and Deal's employment shall be for a term
of three (3) years commencing on September 1, 1997, and expiring on August 31,
2000, but shall be automatically renewed for successive one-year periods
thereafter unless either party gives written notice to the other party of
nonrenewal at least three (3) months in advance of the expiration date.

               3. Compensation: In consideration for all services to be
performed under this Agreement, Deal shall receive the following compensation:

                       A. Salary: Deal shall be paid base salary at the rate of
        One Hundred Twenty Thousand Dollars ($120,000) per year. Annually, the
        Board of Directors, upon the recommendation of the President, shall
        review Deal's performance with a view toward increasing her salary.

                       B. Bonus: Deal shall be entitled to participate in the
        Company's Annual Executive Incentive Plan and the Long Term Executive
        Incentive Plan, subject to all of the terms and conditions set forth in
        said plans, as amended from time to time, as long as such plans remain
        in effect, and to participate in any successor or similar incentive plan
        available to management personnel of comparable status with the Company
        or its affiliates. Nothing herein or in said plans shall constitute a
        guarantee of Deal's employment by the Company, or a limitation on the
        Company's rights under this Agreement, or limitation on the Company's
        rights to amend or terminate any plan.

                       C. Employee Benefit Plans: Deal shall be entitled to
        participate in all employee benefit plans, including group medical,
        dental, visual, and life insurance, pension, profit sharing, group and
        individual disability income, stock option, vacation, and other benefit
        plans, on terms commensurate with the benefits awarded management
        personnel of comparable status with the Company or any affiliate of the
        Company, but subject, on any termination, to Section 4.E below.


                                    Page 19
<PAGE>   2

                       D. Expense Reimbursement: The Company shall reimburse
        Deal for all reasonable expenses that she necessarily incurs in
        connection with her employment and for which she presents adequate
        documentation in accordance with Company policies in effect from time to
        time.

               4. Termination: This Agreement and Deal's employment are subject
to immediate termination at any time as follows:

                       A. Death: This Agreement shall terminate immediately upon
        Deal's death, in which event the Company's only obligations shall be (i)
        to pay all compensation owing for services rendered by Deal prior to the
        date of her death; (ii) to continue paying Deal's base salary to her
        estate for a period of thirty (30) days after her death; and (iii) to
        make periodic recoverable advances to Deal's estate equivalent to Deal's
        base salary for ninety (90) days after said thirty (30) day period has
        lapsed, or until the proceeds from the life insurance policy on Deal's
        life referred to in this Agreement become available, whichever occurs
        first, with such advances to be repaid when said insurance proceeds
        become available.

                       B. Disability: In the event that Deal is disabled from
        performing her assigned duties under this Agreement due to illness or
        injury for a period in excess of one hundred eighty (180) days, the
        Company may place Deal on an unpaid leave of absence for a period not to
        exceed six (6) months, in which case the Company's only obligation shall
        be (i) to continue Deal's group medical and life insurance for the
        duration of the leave; (ii) to pay the bonus, if any, that Deal would be
        entitled to under the terms of the bonus plans referred to in Section 3B
        of this Agreement; and (iii) to allow Deal to continue receiving
        benefits under the disability insurance and other employee benefit plans
        in effect at the time of her disability in accordance with the terms and
        conditions of such plans. The granting of a leave of absence does not
        guarantee that Deal will be returned to employment, and the Company
        reserves the right to replace Deal or to take other action in her
        absence due to business necessity. If Deal is certified to return to
        work before her leave of absence expires, and desires to do so, the
        following provisions shall apply: (i) the Company will attempt to return
        Deal to her same or similar position, provided this does not result in
        undue hardship to the Company; and (ii) if the Company is unable to
        reinstate Deal because her position has been filled, then as a special
        severance benefit, the Company shall pay a lump-sum severance payment
        equal to twenty (20) months of Deal's base salary as in effect
        immediately prior to the commencement of Deal's leave of absence. If
        Deal is not certified to return to work before her leave of absence
        expires, or does not desire to return, her employment and this Agreement
        shall terminate upon the expiration of her leave of absence.

                       C. Termination For Cause: The Company may terminate this
        Agreement for cause immediately upon written notice to Deal in the event
        Deal (i) engages in any material misconduct, willful breach, or habitual
        neglect of her duties as an officer of the Company, or (ii) is finally
        convicted of a felony. In either event, the Company's sole obligation to
        Deal in lieu of all claims for compensation or damages shall be to pay
        all compensation owing for services rendered by Deal prior to the date
        of termination under this subsection.

                       D. Termination Without Cause: The Company in its sole
        discretion may terminate this Agreement without cause or prior warning
        immediately upon written notice to Deal. For purposes of this Section
        4D, any 


                                    Page 20
<PAGE>   3

        failure to renew this Agreement and any resignation following a
        substantial reduction in Deal's salary, duties or responsibilities shall
        constitute an involuntary termination without cause. In the event of a
        termination under this Section 4D the Company shall pay all compensation
        owing for services rendered by Deal prior to the date of termination,
        shall pay a lump-sum severance benefit equal to twelve (12) months of
        Deal's base salary at the time of termination, and shall continue to
        provide Deal at Company expense all medical, disability and insurance
        benefits available to her at the time of termination for a period of
        twelve (12) months after the termination or, if shorter, the maximum
        period allowed under the Company's policies as then in effect or under
        applicable law. As an additional severance payment, if the Company has
        in effect at the time of any termination without cause under this
        Section 4D any bonus or incentive plan which provides for awards in cash
        and is based on the Company's revenues or results of operations for a
        fiscal year, Deal shall be entitled to an amount equal to a pro rata
        award based on the period of the fiscal year for which she was employed
        if a termination under this Section 4D occurs after the completion of
        three fiscal quarters. Such severance shall be payable at the same time,
        and computed on the same terms, as awards under the plan in question,
        except for periods of service. Such payments and benefits shall not
        entitle Deal to any other benefits or compensation program available to
        Company employees.

                       E. Termination Following Change In Control: If either the
        Company elects to terminate Deal without cause pursuant to Section 4(D)
        within ninety (90) days before or twenty four (24) months after a change
        in control or Deal elects to resign with good reason within twenty four
        (24) months after a change in control of the Company, then as a
        severance benefit and in lieu of all compensation or damages the Company
        shall (i) pay Deal a lump sum equal to 200% of the average of the annual
        base salary plus bonuses paid to Deal during each of the three years
        prior to the time of such termination or resignation, (ii) continue to
        provide Deal at Company expense all medical, disability and insurance
        benefits available to her at the time of such termination or resignation
        for a period of twenty four (24) months after such termination or
        resignation, or, if shorter, the maximum period allowed under the
        Company's policies as then in effect or under applicable law, (iii)
        accelerate the vesting of all unvested stock options granted to Deal
        under the Company's stock option or other benefit plans so that all such
        stock options will vest and be fully exercisable on the date of such
        termination or resignation, and (iv) extend the post-termination
        exercise period for all stock options granted to Deal under the
        Company's stock option and other benefit plans so that all such stock
        options will be exercisable for a period of three months after the date
        of such termination or resignation (except that with respect to any
        stock options having a post-termination exercise period in excess of
        three months, such longer post-termination exercise period shall remain
        in effect).

                       For purposes of this subsection, the term "change in
        control" shall mean any change in control that the Company would be
        required to report in response to Item 5(f) of Schedule 14A of
        Regulation 14A promulgated under the Securities Exchange Act of 1934, as
        amended (the "Exchange Act"). Without limiting the foregoing, a change
        in control shall also be deemed to have occurred if (i) any "person" as
        defined in Section 13(d) and 14(d) of the Exchange Act is or becomes,
        directly or indirectly, the "beneficial owner" as defined in Rule 13
        (d-3) under the Exchange Act of securities of the Company which
        represent 25% or more of the combined voting power of the Company's then
        outstanding securities; or (ii) during any period of two consecutive
        years, 



                                    Page 21
<PAGE>   4

        individuals who at the beginning of said two year period constituted the
        Board of Directors of the Company cease for any reason to constitute at
        least a majority of the Board unless the election or nomination of each
        new director was approved by a vote of at least two-thirds of the
        directors who were in office at the beginning of said two year period.

                       For purposes of this subsection, Deal shall be deemed to
        have resigned "with good reason" if she does so following a change in
        control as a result of the Company having done any or all of the
        following without Deal's express written consent: (i) assigned Deal
        different duties or made changes in her reporting responsibilities,
        title, or office that are substantially inconsistent with Deal's duties,
        responsibilities, titles, or offices immediately prior to the change in
        control; (ii) reduced Deal's base salary from that in effect at the time
        of the change in control; (iii) failed to continue any bonus plan in
        substantially the same form as it existed prior to the change in
        control; (iv) required Deal to be based more than fifty (50) miles from
        her present office location, except for required travel consistent with
        Deal's present business travel obligations; (v) failed to continue any
        plan or program for compensation, employee benefits, stock purchase or
        ownership, life insurance, group medical, disability, or vacation in
        substantially the same form as immediately prior to the change in
        control, or otherwise made any material reduction in Deal's fringe
        benefits, or (vi) failed to obtain the assumption of this Agreement by
        any successor to the Company.

                       Deal shall not be entitled to the benefits of this
        Section 4(E) if this Agreement and her employment are terminated
        pursuant to Section 4(A), (B) or (C).

                       F. Company's Obligations Under This Agreement Exclusive:
        The benefits set forth in subsections A through E above (which benefits,
        in the event of termination pursuant to subsections A, C, D or E,
        include payment for services rendered prior to termination as provided
        in such subsections), as applicable, constitute the sole obligations of
        the Company to Deal upon a termination and are in lieu of any damages or
        other compensation that Deal may claim under other Company policies in
        connection with this Agreement. The benefits on termination in this
        Agreement are in substitution for any severance or termination benefits
        otherwise available under Company policies of general application. Deal
        expressly acknowledges that certain Company benefit or incentive plans
        provide for vesting in, or award of, benefits based on employment on or
        through particular dates and that nothing in this Agreement entitles her
        to partial vesting or partial awards under such plans. Any payments
        under Section 4D relating to any incentive or bonus plan are expressly
        acknowledged to be benefits under this Agreement and not an
        interpretation or modification of any such plan.

                       G. Resignation As Officer: In the event of any
        termination pursuant to this Section 4, Deal shall be deemed to have
        resigned as an officer of the Company if she was serving in such
        capacity at the time of termination.

               5. Confidentiality: Deal acknowledges and agrees that she has
been and will continue to be entrusted with trade and proprietary information
regarding the products, processes, methods of manufacture and delivery,
know-how, designs, formula, work in progress, research and development, computer
software and data bases, copyrights, trademarks, patents, marketing techniques,
and future business 



                                    Page 22
<PAGE>   5

plans, as well as customer lists and information concerning the identity, needs,
and desires of actual and potential customers of the Company and its
subsidiaries, joint venturers, partners, and other affiliated persons and
entities ("Confidential Information"), all of which derive significant economic
value from not being generally known to others outside the Company.

                       A. During the entire term of her employment with the
        Company and for two years thereafter, Deal shall not disclose or exploit
        any Confidential Information except for the sole benefit of the Company
        or with its express written consent.

                       B. During the entire term of her employment by the
        Company and for one year thereafter, Deal shall not directly or
        indirectly solicit any actual or potential customer of the Company or
        its subsidiary and affiliated companies for any business that competes
        directly or indirectly with the Company, except for the sole benefit of
        the Company or with its express written consent.

                       C. During the entire term of her employment by the
        Company and for one year thereafter, Deal shall not induce or attempt to
        induce any employee of the Company to leave the Company's employ except
        for the sole benefit of the Company or with its express written consent.

                       D. In the event any provision in this Section 5 is more
        restrictive than allowed by the law of any jurisdiction in which the
        Company seeks enforcement, such provision shall be deemed amended and
        shall then be fully enforceable to the extent permitted by such law.

                       E. Deal acknowledges and agrees that any violation of
        this Section 5 would cause immediate irreparable damage to the Company,
        and that it would be extremely difficult or impossible to determine the
        amount of damage caused to the Company. Deal therefore agrees that the
        Company's remedies at law are inadequate, and hereby consents to
        issuance of a temporary restraining order, preliminary and permanent
        injunction, and other appropriate relief to restrain any actual or
        threatened violation of this Section, without limiting any remedies the
        Company may have at law or in equity.

               6. Inventions: Any and all patents, copyrights, trademarks,
inventions, discoveries, developments, or trade secrets developed or perfected
by Deal during or as the result of her employment with the Company shall
constitute the sole and exclusive property of the Company. Deal shall disclose
all such matters to the Company, assign all right, title and interest she may
have in them, and cooperate with the Company in obtaining and perfecting any
patent, copyright, trademark, or other legal protection. This Section 6 shall
not apply to any invention which qualifies fully under California Labor Code
Section 2870, a true copy of which is attached to this Agreement as Exhibit A.

               7. Conflict Of Interest: During the term of this Agreement, Deal
shall devote her time, ability, and attention to the business of the Company,
and shall not accept other employment or engage in any other outside business
activity which interferes with the performance of her duties and
responsibilities under this Agreement or which involves actual or potential
competition with the business of the Company, except with the express written
consent of the President.


                                    Page 23
<PAGE>   6

               8. Employee Benefit Plans: All of the employee benefit plans
referred to or contemplated by this Agreement shall be governed solely by the
terms of the underlying plan documents and by applicable law. Nothing in this
Agreement shall impair the Company's right to amend, modify, replace and
terminate any and all such plans in its sole discretion as provided by law, or
to terminate this Agreement in accordance with its terms. This Agreement is for
the sole benefit of Deal and the Company, and is not intended to create an
employee benefit plan or to modify the term of existing plans.

               9. Parachute Limitation: The payments and benefits Deal is
entitled to under this Agreement and all other contracts, arrangements, or
programs shall not, in the aggregate, exceed the maximum amount that may be paid
to Deal without triggering golden parachute penalties under Section 280G and
related provisions of the Internal Revenue Code, as determined in good faith by
the Company's independent auditors. If Deal's benefits must be cut back to avoid
triggering such penalties, Deal's benefits shall be cut back in the priority
order designated by Deal or, if Deal fails promptly to designate an order, in
the priority order designated by the Company. If an amount in excess of the
limit set forth in this Section is paid to Deal, Deal must repay the excess
amount to the Company upon demand, with interest at the rate provided for in
Internal Revenue Code Section 1274(b)(2)(B). Deal and the Company agree
reasonably to cooperate with each other in connection with any administrative or
judicial proceedings concerning the existence or amount of golden parachute
penalties with respect to payments or benefits Deal receives.

               10. Assignment: This Agreement may not be assigned by Deal, but
may be assigned by the Company to any successor in interest to its business. In
the event the Company does not survive any merger, acquisition, or other
reorganization, it shall make a reasonable effort to obtain an assumption of
this Agreement by the surviving entity in such merger, acquisition, or other
reorganization, but the failure to obtain such assumption shall not prevent or
delay such merger, acquisition, or other reorganization or relieve the Company
of its other obligations under this Agreement. This Agreement shall bind and
inure to the benefit of the Company's successors and assigns, as well as Deal's
heirs, executors, administrators, and legal representatives.

               11. Notices: All notices required by this Agreement may be
delivered by first class mail at the following addresses:

               To the Company:        Hycor Biomedical Inc.
                                      18800 Von Karman Avenue
                                      Irvine, California 92715

               To Deal:               Mary Jo Deal
                                      6352 Marcellena Drive
                                      Huntington Beach, California 92647

               12. Amendment. This Agreement may be modified only by written
agreement signed by the party against whom any amendment is to be enforced.

               13. Choice Of Law: This Agreement shall be governed by the laws
of the State of California.

               14. Partial Invalidity: In the event any provision of this
Agreement is void or unenforceable, the remaining provisions shall continue in
full force and effect.


                                    Page 24
<PAGE>   7

               15. Waiver: No waiver of any breach of this Agreement shall
constitute a waiver of any subsequent breach.

               16. Complete Agreement: This Agreement contains the entire
agreement between the parties, and supersedes any and all prior and
contemporaneous oral and written agreements, including Deal's previous
employment contracts, which shall have no further force and effect.

MARY JO DEAL


__________________________________               Dated: _______________________



HYCOR BIOMEDICAL INC.


By:_______________________________               Dated: _______________________

Name:     Richard D. Hamill, Ph.D.
      -----------------------------------
Title:       Chairman, President & CEO
       ----------------------------------

                                    Page 25
<PAGE>   8

                                    EXHIBIT A

                       CALIFORNIA LABOR CODE SECTION 2870

                   EMPLOYMENT AGREEMENTS; ASSIGNMENT OF RENTS

        (a) Any provision in an employment agreement which provides that an
employee shall assign, or offer to assign, any of her or her rights in an
invention to her or her employer shall not apply to an invention that the
employee developed entirely on her or her own time without using the employer's
equipment, supplies, facilities, or trade secret information except for those
inventions that either:

               (1) Relate at the time of conception or reduction to practice of
               the invention to the employer's business, or actual or
               demonstrably anticipated research or development of the employer;
               or

               (2) Result from any work performed by the employee for the
               employer.

        (b) To the extent a provision in an employment agreement purports to
            require an employee to assign an invention otherwise excluded from
            being required to be assigned under subdivision (a), the provision
            is against the public policy of this state and is unenforceable.


                                    Page 26

<PAGE>   1

                                                                    EXHIBIT 10.3

                              EMPLOYMENT AGREEMENT
                              --------------------

               THIS EMPLOYMENT AGREEMENT ("Agreement") is made and entered into
by HYCOR BIOMEDICAL INC., a Delaware corporation ("Company"), and REGINALD P.
JONES ("Jones).

               WHEREAS, the Company desires to employ Jones in an executive
capacity, Jones desires to accept such employment, and the parties desire to
memorialize the terms and conditions of their employment relationship,

               NOW, THEREFORE, in consideration of the promises and covenants
set forth in this Agreement and for other valuable consideration, the parties
agree as follows:

               1. Employment: Jones shall be employed as a Vice President of the
Company reporting to the President, and shall faithfully and diligently perform
all duties and responsibilities required of such position or assigned by the
President from time to time, including service on behalf of the Company's
subsidiary and affiliated companies and as a member of the Board of Directors.

               2. Term: This Agreement and Jones' employment shall be for a term
of three (3) years commencing on June 20, 1997 and expiring on June 19, 2000,
but shall be automatically renewed for successive one-year periods thereafter
unless either party gives written notice to the other party of nonrenewal at
least three (3) months in advance of the expiration date.

               3. Compensation: In consideration for all services to be
performed under this Agreement, Jones shall receive the following compensation:

                  A. Salary: Jones shall be paid base salary at the rate of One
Hundred Eighty-Four Thousand Thousand One Hundred Dollars ($184,100) per year.
Annually, the Board of Directors, upon the recommendation of the President,
shall review Jones' performance with a view toward increasing his salary.

                  B. Bonus: Jones shall be entitled to participate in the
Company's Annual Executive Incentive Plan and the Long Term Executive Incentive
Plan, subject to all of the terms and conditions set forth in said plans, as
amended from time to time, as long as such plans remain in effect, and to
participate in any successor or similar incentive plan available to management
personnel of comparable status with the Company or its affiliates. Nothing
herein or in said plans shall constitute a guarantee of Jones' employment by the
Company, or a limitation on the Company's rights under this Agreement, or
limitation on the Company's rights to amend or terminate any plan.

                  C. Employee Benefit Plans: Jones shall be entitled to
participate in all employee benefit plans, including group medical, dental,
visual, and life insurance, pension, profit sharing, group and individual
disability income, stock option, vacation, and other benefit plans, on terms
commensurate with the benefits awarded management personnel of comparable status
with the Company or any affiliate of the Company, but subject, on any
termination, to Section 4.E below.


                                    Page 27
<PAGE>   2

                  D. Expense Reimbursement: The Company shall reimburse Jones
for all reasonable expenses that he necessarily incurs in connection with his
employment and for which he presents adequate documentation in accordance with
Company policies in effect from time to time.

               4. Termination: This Agreement and Jones' employment are subject
to immediate termination at any time as follows:

                  A. Death: This Agreement shall terminate immediately upon
Jones' death, in which event the Company's only obligations shall be (i) to pay
all compensation owing for services rendered by Jones prior to the date of his
death; (ii) to continue paying Jones' base salary to his estate for a period of
thirty (30) days after his death; and (iii) to make periodic recoverable
advances to Jones' estate equivalent to Jones' base salary for ninety (90) days
after said thirty (30) day period has lapsed, or until the proceeds from the
life insurance policy on Jones' life referred to in this Agreement become
available, whichever occurs first, with such advances to be repaid when said
insurance proceeds become available.

                  B. Disability: In the event that Jones is disabled from
performing his assigned duties under this Agreement due to illness or injury for
a period in excess of one hundred eighty (180) days, the Company may place Jones
on an unpaid leave of absence for a period not to exceed six (6) months, in
which case the Company's only obligation shall be (i) to continue Jones' group
medical and life insurance for the duration of the leave; (ii) to pay the bonus,
if any, that Jones would be entitled to under the terms of the bonus plans
referred to in Section 3B of this Agreement; and (iii) to allow Jones to
continue receiving benefits under the disability insurance and other employee
benefit plans in effect at the time of his disability in accordance with the
terms and conditions of such plans. The granting of a leave of absence does not
guarantee that Jones will be returned to employment, and the Company reserves
the right to replace Jones or to take other action in his absence due to
business necessity. If Jones is certified to return to work before his leave of
absence expires, and desires to do so, the following provisions shall apply: (i)
the Company will attempt to return Jones to his same or similar position,
provided this does not result in undue hardship to the Company; and (ii) if the
Company is unable to reinstate Jones because his position has been filled, then
as a special severance benefit, the Company shall pay a lump-sum severance
payment equal to twelve (12) months of Jones' base salary as in effect
immediately prior to the commencement of Jones' leave of absence. If Jones is
not certified to return to work before his leave of absence expires, or does not
desire to return, his employment and this Agreement shall terminate upon the
expiration of his leave of absence.

                  C. Termination For Cause: The Company may terminate this
Agreement for cause immediately upon written notice to Jones in the event Jones
(i) engages in any material misconduct, willful breach, or habitual neglect of
his duties as an officer or director of the Company, or (ii) is finally
convicted of a felony. In either event, the Company's sole obligation to Jones
in lieu of all claims for compensation or damages shall be to pay all
compensation owing for services rendered by Jones prior to the date of
termination under this subsection.

                  D. Termination Without Cause: The Company in its sole
discretion may terminate this Agreement without cause or prior warning
immediately upon written notice to Jones. For purposes of this Section 4D, any
failure to renew this Agreement and any resignation following a substantial
reduction in Jones' salary, duties or responsibilities shall constitute an
involuntary termination without cause for the convenience of the Company. In the
event of a termination under this Section 4D


                                    Page 28
<PAGE>   3

the Company shall pay all compensation owing for services rendered by Jones
prior to the date of termination, shall pay a lump-sum severance benefit equal
to twelve (12) months of Jones' base salary at the time of termination, and
shall continue to provide Jones at Company expense all medical, disability and
insurance benefits available to him at the time of termination for a period of
twelve (12) months after the termination or, if shorter, the maximum period
allowed under the Company's policies as then in effect or under applicable law.
As an additional severance payment, if the Company has in effect at the time of
any termination without cause under this Section 4D any bonus or incentive plan
which provides for awards in cash and is based on the Company's revenues or
results of operations for a fiscal year or other period, Jones shall be entitled
to an amount equal to a pro rata award based on the portion of the fiscal year
or other period for which he was employed if a termination under this Section 4D
occurs after the completion of three fiscal quarters or an equivalent portion of
such other period. Such severance shall be payable at the same time, and
computed on the same terms, as awards under the plan in question, except for
periods of service. In addition, any termination under this Section 4D shall
constitute a termination for the convenience of the Company and shall extend the
post-termination exercise period for all stock options granted to Jones under
Company's stock option and other benefit plans so that all such options will be
exercisable for the longer of three months following the date of termination or
any longer period provided in such plan. Such payments and benefits shall not
entitle Jones to any other benefits or compensation program available to Company
employees.

                  E. Termination Following Change In Control: If either the
Company elects to terminate Jones without cause pursuant to Section 4(D) within
ninety (90) days before or twenty four (24) months after a change in control or
Jones elects to resign with good reason within twenty four (24) months after a
change in control of the Company, then as a severance benefit and in lieu of all
compensation or damages the Company shall (i) pay Jones a lump sum equal to 200%
of the average of the annual base salary plus bonuses paid to Jones during each
of the three years prior to the time of such termination or resignation, (ii)
continue to provide Jones at Company expense all medical, disability and
insurance benefits available to him at the time of such termination or
resignation for a period of twenty four (24) months after such termination or
resignation, or, if shorter, the maximum period allowed under the Company's
policies as then in effect or under applicable law, (iii) accelerate the vesting
of all unvested stock options granted to Jones under the Company's stock option
or other benefit plans so that all such stock options will vest and be fully
exercisable on the date of such termination or resignation, and (iv) extend the
post-termination exercise period for all stock options granted to Jones under
the Company's stock option and other benefit plans so that all such stock
options will be exercisable for the longer of three months after the date of
such termination or resignation or any longer post-termination exercise period
provided in such plan.

                       For purposes of this subsection, the term "change in
control" shall mean any change in control that the Company would be required to
report in response to Item 5(f) of Schedule 14A of Regulation 14A promulgated
under the Securities Exchange Act of 1934, as amended (the "Exchange Act").
Without limiting the foregoing, a change in control shall also be deemed to have
occurred if (i) any "person" as defined in Section 13(d) and 14(d) of the
Exchange Act is or becomes, directly or indirectly, the "beneficial owner" as
defined in Rule 13 (d-3) under the Exchange Act of securities of the Company
which represent 25% or more of the combined voting power of the Company's then
outstanding securities; or (ii) during any period of two consecutive years,
individuals who at the beginning of said two year period constituted the Board
of Directors of the Company cease for any reason to 


                                    Page 29
<PAGE>   4

constitute at least a majority of the Board unless the election or nomination of
each new director was approved by a vote of at least two-thirds of the directors
who were in office at the beginning of said two year period.

                       For purposes of this subsection, Jones shall be deemed to
have resigned "with good reason" if he does so following a change in control as
a result of the Company having done any or all of the following without Jones'
express written consent: (i) assigned Jones different duties or made changes in
his reporting responsibilities, title, or office that are substantially
inconsistent with Jones' duties, responsibilities, titles, or offices
immediately prior to the change in control; (ii) reduced Jones' base salary from
that in effect at the time of the change in control; (iii) failed to continue
any bonus plan in substantially the same form as it existed prior to the change
in control; (iv) required Jones to be based more than fifty (50) miles from his
present office location, except for required travel consistent with Jones'
present business travel obligations; (v) failed to continue any plan or program
for compensation, employee benefits, stock purchase or ownership, life
insurance, group medical, disability, or vacation in substantially the same form
as immediately prior to the change in control, or otherwise made any material
reduction in Jones' fringe benefits, or (vi) failed to obtain the assumption of
this Agreement by any successor to the Company.

                       Jones shall not be entitled to the benefits of this
Section 4(E) if this Agreement and his employment are terminated pursuant to
Section 4(A), (B) or (C). If Jones institutes legal proceedings to enforce any
provision of this Section 4E or any other provision of this Agreement providing
rights or benefits after a change of control, he shall be entitled to recover
from the Company all costs, fees and expenses of such proceeding if he is the
prevailing party.

                  F. Company's Obligations Under This Agreement Exclusive: The
benefits set forth in subsections A through E above (which benefits, in the
event of termination pursuant to subsections A, C, D or E, include payment for
services rendered prior to termination as provided in such subsections), as
applicable, constitute the sole obligations of the Company to Jones upon a
termination and are in lieu of any damages or other compensation that Jones may
claim under other Company policies in connection with this Agreement. The
benefits on termination in this Agreement are in substitution for any severance
or termination benefits otherwise available under Company policies of general
application. Jones expressly acknowledges that certain Company benefit or
incentive plans provide for vesting in, or award of, benefits based on
employment on or through particular dates and that nothing in this Agreement
entitles him to partial vesting or partial awards under such plans. Any payments
under Section 4D relating to any incentive or bonus plan are expressly
acknowledged to be benefits under this Agreement and not an interpretation or
modification of any such plan.

                  G. Resignation As Officer and Director: In the event of any
termination pursuant to this Section 4, Jones shall be deemed to have resigned
as an officer and director of the Company if he was serving in such capacity at
the time of termination.

               5. Confidentiality: Jones acknowledges and agrees that he has
been and will continue to be entrusted with trade and proprietary information
regarding the products, processes, methods of manufacture and delivery,
know-how, designs, formula, work in progress, research and development, computer
software and data bases, copyrights, trademarks, patents, marketing techniques,
and future business 


                                    Page 30
<PAGE>   5

plans, as well as customer lists and information concerning the identity, needs,
and desires of actual and potential customers of the Company and its
subsidiaries, joint venturers, partners, and other affiliated persons and
entities ("Confidential Information"), all of which derive significant economic
value from not being generally known to others outside the Company.

                           A. During the entire term of his employment with the
        Company and for two years thereafter, Jones shall not disclose or
        exploit any Confidential Information except for the sole benefit of the
        Company or with its express written consent.

                           B. During the entire term of his employment by the
        Company and for one year thereafter, Jones shall not directly or
        indirectly solicit any actual or potential customer of the Company or
        its subsidiary and affiliated companies for any business that competes
        directly or indirectly with the Company, except for the sole benefit of
        the Company or with its express written consent.

                           C. During the entire term of his employment by the
        Company and for one year thereafter, Jones shall not induce or attempt
        to induce any employee of the Company to leave the Company's employ
        except for the sole benefit of the Company or with its express written
        consent.

                           D. In the event any provision in this Section 5 is
        more restrictive than allowed by the law of any jurisdiction in which
        the Company seeks enforcement, such provision shall be deemed amended
        and shall then be fully enforceable to the extent permitted by such law.

                           E. Jones acknowledges and agrees that any violation
        of this Section 5 would cause immediate irreparable damage to the
        Company, and that it would be extremely difficult or impossible to
        determine the amount of damage caused to the Company. Jones therefore
        agrees that the Company's remedies at law are inadequate, and hereby
        consents to issuance of a temporary restraining order, preliminary and
        permanent injunction, and other appropriate relief to restrain any
        actual or threatened violation of this Section, without limiting any
        remedies the Company may have at law or in equity.

               6. Inventions: Any and all patents, copyrights, trademarks,
inventions, discoveries, developments, or trade secrets developed or perfected
by Jones during or as the result of his employment with the Company shall
constitute the sole and exclusive property of the Company. Jones shall disclose
all such matters to the Company, assign all right, title and interest he may
have in them, and cooperate with the Company in obtaining and perfecting any
patent, copyright, trademark, or other legal protection. This Section 6 shall
not apply to any invention which qualifies fully under California Labor Code
Section 2870, a true copy of which is attached to this Agreement as Exhibit A.

                  7. Conflict Of Interest: During the term of this Agreement,
Jones shall devote his time, ability, and attention to the business of the
Company, and shall not accept other employment or engage in any other outside
business activity which interferes with the performance of his duties and
responsibilities under this Agreement or which involves actual or potential
competition with the business of the Company, except with the express written
consent of the President.


                                    Page 31
<PAGE>   6

               8. Employee Benefit Plans: All of the employee benefit plans
referred to or contemplated by this Agreement shall be governed solely by the
terms of the underlying plan documents and by applicable law. Nothing in this
Agreement shall impair the Company's right to amend, modify, replace and
terminate any and all such plans in its sole discretion as provided by law, or
to terminate this Agreement in accordance with its terms. This Agreement is for
the sole benefit of Jones and the Company, and is not intended to create an
employee benefit plan or to modify the term of existing plans.

               9. Parachute Limitation:

                  A. If the payments and benefits Jones is entitled to under
        this Agreement and all other contracts, arrangements, or programs upon a
        change in control shall, in the aggregate, exceed the maximum amount
        that may be paid to Jones without triggering golden parachute penalties
        under Section 280G and related provisions of the Internal Revenue Code,
        as determined in good faith by the Company's independent auditors (the
        "280G Ceiling"), then the cash amounts paid to Jones shall be increased
        to the extent necessary to compensate Jones for all excise taxes
        resulting from exceeding the 280G Ceiling, and all income and other
        taxes due on such increased amounts, until Jones has received all
        amounts he would have received if no excise taxes were due under Section
        280G.

                  B. Although the Company does not believe it possible under the
        terms of this Agreement, if the payments and benefits Jones would be
        entitled to receive upon a termination would exceed the 280G Ceiling and
        there has been no change in control, Jones' benefits shall be cut back
        in the priority order designated by Jones or, if Jones fails promptly to
        designate an order, in the priority order designated by the Company, to
        an amount $1 less than the 280G Ceiling. If an amount in excess of the
        limit set forth in this Section is paid to Jones and there has been no
        change in control, Jones must repay the excess amount to the Company
        upon demand. Jones and the Company agree reasonably to cooperate with
        each other in connection with any administrative or judicial proceedings
        concerning the existence or amount of golden parachute penalties with
        respect to payments or benefits Jones receives.

               10. Assignment: This Agreement may not be assigned by Jones, but
may be assigned by the Company to any successor in interest to its business. In
the event the Company does not survive any merger, acquisition, or other
reorganization, it shall make a reasonable effort to obtain an assumption of
this Agreement by the surviving entity in such merger, acquisition, or other
reorganization, but the failure to obtain such assumption shall not prevent or
delay such merger, acquisition, or other reorganization or relieve the Company
of its other obligations under this Agreement. This Agreement shall bind and
inure to the benefit of the Company's successors and assigns, as well as Jones'
heirs, executors, administrators, and legal representatives.



                                    Page 32
<PAGE>   7

               11. Notices: All notices required by this Agreement may be
delivered by first class mail at the following addresses:

               To the Company:        Hycor Biomedical Inc.
                                      18800 Von Karman Avenue
                                      Irvine, California 92715

               To Jones:              Reginald P. Jones
                                      26891 Venado
                                      Mission Viejo, California 92691

               12. Amendment: This Agreement may be modified only by written
agreement signed by the party against whom any amendment is to be enforced.

               13. Choice Of Law: This Agreement shall be governed by the laws
of the State of California.

               14. Partial Invalidity: In the event any provision of this
Agreement is void or unenforceable, the remaining provisions shall continue in
full force and effect.

               15. Waiver: No waiver of any breach of this Agreement shall
constitute a waiver of any subsequent breach.

               16. Complete Agreement: This Agreement contains the entire
agreement between the parties, and supersedes any and all prior and
contemporaneous oral and written agreements, including Jones' previous
employment contracts, which shall have no further force and effect.

"Jones"                                      "Company"

REGINALD P. JONES                            HYCOR BIOMEDICAL INC.

______________________________               By:______________________________
                                             Name:____________________________
Dated:________________________               Dated:___________________________



                                    Page 33
<PAGE>   8

                                    EXHIBIT A

                       CALIFORNIA LABOR CODE SECTION 2870

                   EMPLOYMENT AGREEMENTS; ASSIGNMENT OF RENTS

        (a) Any provision in an employment agreement which provides that an
employee shall assign, or offer to assign, any of his or her rights in an
invention to his or her employer shall not apply to an invention that the
employee developed entirely on his or her own time without using the employer's
equipment, supplies, facilities, or trade secret information except for those
inventions that either:

               (1) Relate at the time of conception or reduction to practice of
               the invention to the employer's business, or actual or
               demonstrably anticipated research or development of the employer;
               or

               (2) Result from any work performed by the employee for the
               employer.

        (b) To the extent a provision in an employment agreement purports to
require an employee to assign an invention otherwise excluded from being
required to be assigned under subdivision (a), the provision is against the
public policy of this state and is unenforceable.


                                    Page 34

<PAGE>   1

                                                                    EXHIBIT 10.4

                              EMPLOYMENT AGREEMENT
                              --------------------

               THIS EMPLOYMENT AGREEMENT ("Agreement") is made and entered into
by HYCOR BIOMEDICAL INC., a Delaware corporation ("Company"), and THOMAS M. LI
("Li").

               WHEREAS, the Company desires to employ Li in an executive
capacity, Li desires to accept such employment, and the parties desire to
memorialize the terms and conditions of their employment relationship,

               NOW, THEREFORE, in consideration of the promises and covenants
set forth in this Agreement and for other valuable consideration, the parties
agree as follows:

               1. Employment: Li shall be employed as a Vice President of the
Company reporting to the President, and shall faithfully and diligently perform
all duties and responsibilities required of such position or assigned by the
President from time to time, including service on behalf of the Company's
subsidiary and affiliated companies.

               2. Term. This Agreement and Li's employment shall be for a term
of three (3) years commencing on June 20, 1997, and expiring on June 19, 2000,
but shall be automatically renewed for successive one-year periods thereafter
unless either party gives written notice to the other party of nonrenewal at
least three (3) months in advance of the expiration date.

               3. Compensation: In consideration for all services to be
performed under this Agreement, Li shall receive the following compensation:

                  A. Salary: Li shall be paid base salary at the rate of One
        Hundred Fifty Eight Thousand Six Hundred Dollars ($158,600) per year.
        Annually, the Board of Directors, upon the recommendation of the
        President, shall review Li's performance with a view toward increasing
        his salary.

                  B. Bonus: Li shall be entitled to participate in the Company's
        Annual Executive Incentive Plan and the Long Term Executive Incentive
        Plan, subject to all of the terms and conditions set forth in said
        plans, as amended from time to time, as long as such plans remain in
        effect, and to participate in any successor or similar incentive plan
        available to management personnel of comparable status with the Company
        or its affiliates. Nothing herein or in said plans shall constitute a
        guarantee of Li's employment by the Company, or a limitation on the
        Company's rights under this Agreement, or limitation on the Company's
        rights to amend or terminate any plan.

                  C. Employee Benefit Plans: Li shall be entitled to participate
        in all employee benefit plans, including group medical, dental, visual,
        and life insurance, pension, profit sharing, group and individual
        disability income, stock option, vacation, and other benefit plans, on
        terms commensurate with the benefits awarded management personnel of
        comparable status with the Company or any affiliate of the Company, but
        subject, on any termination, to Section 4.E below.


                                    Page 35
<PAGE>   2

                  D. Expense Reimbursement: The Company shall reimburse Li for
        all reasonable expenses that he necessarily incurs in connection with
        his employment and for which he presents adequate documentation in
        accordance with Company policies in effect from time to time.

               4. Termination: This Agreement and Li's employment are subject to
immediate termination at any time as follows:

                  A. Death: This Agreement shall terminate immediately upon Li's
        death, in which event the Company's only obligations shall be (i) to pay
        all compensation owing for services rendered by Li prior to the date of
        his death; (ii) to continue paying Li's base salary to his estate for a
        period of thirty (30) days after his death; and (iii) to make periodic
        recoverable advances to Li's estate equivalent to Li's base salary for
        ninety (90) days after said thirty (30) day period has lapsed, or until
        the proceeds from the life insurance policy on Li's life referred to in
        this Agreement become available, whichever occurs first, with such
        advances to be repaid when said insurance proceeds become available.

                  B. Disability: In the event that Li is disabled from
        performing his assigned duties under this Agreement due to illness or
        injury for a period in excess of one hundred eighty (180) days, the
        Company may place Li on an unpaid leave of absence for a period not to
        exceed six (6) months, in which case the Company's only obligation shall
        be (i) to continue Li's group medical and life insurance for the
        duration of the leave; (ii) to pay the bonus, if any, that Li would be
        entitled to under the terms of the bonus plans referred to in Section 3B
        of this Agreement; and (iii) to allow Li to continue receiving benefits
        under the disability insurance and other employee benefit plans in
        effect at the time of his disability in accordance with the terms and
        conditions of such plans. The granting of a leave of absence does not
        guarantee that Li will be returned to employment, and the Company
        reserves the right to replace Li or to take other action in his absence
        due to business necessity. If Li is certified to return to work before
        his leave of absence expires, and desires to do so, the following
        provisions shall apply: (i) the Company will attempt to return Li to his
        same or similar position, provided this does not result in undue
        hardship to the Company; and (ii) if the Company is unable to reinstate
        Li because his position has been filled, then as a special severance
        benefit, the Company shall pay a lump-sum severance payment equal to
        twenty (20) months of Li's base salary as in effect immediately prior to
        the commencement of Li's leave of absence. If Li is not certified to
        return to work before his leave of absence expires, or does not desire
        to return, his employment and this Agreement shall terminate upon the
        expiration of his leave of absence.

                  C. Termination For Cause: The Company may terminate this
        Agreement for cause immediately upon written notice to Li in the event
        Li (i) engages in any material misconduct, willful breach, or habitual
        neglect of his duties as an officer of the Company, or (ii) is finally
        convicted of a felony. In either event, the Company's sole obligation to
        Li in lieu of all claims for compensation or damages shall be to pay all
        compensation owing for services rendered by Li prior to the date of
        termination under this subsection.

                  D. Termination Without Cause: The Company in its sole
        discretion may terminate this Agreement without cause or prior warning


                                    Page 36
<PAGE>   3

        immediately upon written notice to Li. For purposes of this Section 4D,
        any failure to renew this Agreement and any resignation following a
        substantial reduction in Li's salary, duties or responsibilities shall
        constitute an involuntary termination without cause. In the event of a
        termination under this Section 4D the Company shall pay all compensation
        owing for services rendered by Li prior to the date of termination,
        shall pay a lump-sum severance benefit equal to twelve (12) months of
        Li's base salary at the time of termination, and shall continue to
        provide Li at Company expense all medical, disability and insurance
        benefits available to him at the time of termination for a period of
        twelve (12) months after the termination or, if shorter, the maximum
        period allowed under the Company's policies as then in effect or under
        applicable law. As an additional severance payment, if the Company has
        in effect at the time of any termination without cause under this
        Section 4D any bonus or incentive plan which provides for awards in cash
        and is based on the Company's revenues or results of operations for a
        fiscal year, Li shall be entitled to an amount equal to a pro rata award
        based on the period of the fiscal year for which he was employed if a
        termination under this Section 4D occurs after the completion of three
        fiscal quarters. Such severance shall be payable at the same time, and
        computed on the same terms, as awards under the plan in question, except
        for periods of service. Such payments and benefits shall not entitle Li
        to any other benefits or compensation program available to Company
        employees.

                  E. Termination Following Change In Control: If either the
        Company elects to terminate Li without cause pursuant to Section 4(D)
        within ninety (90) days before or twenty four (24) months after a change
        in control or Li elects to resign with good reason within twenty four
        (24) months after a change in control of the Company, then as a
        severance benefit and in lieu of all compensation or damages the Company
        shall (i) pay Li a lump sum equal to 200% of the average of the annual
        base salary plus bonuses paid to Li during each of the three years prior
        to the time of such termination or resignation, (ii) continue to provide
        Li at Company expense all medical, disability and insurance benefits
        available to him at the time of such termination or resignation for a
        period of twenty four (24) months after such termination or resignation,
        or, if shorter, the maximum period allowed under the Company's policies
        as then in effect or under applicable law, (iii) accelerate the vesting
        of all unvested stock options granted to Li under the Company's stock
        option or other benefit plans so that all such stock options will vest
        and be fully exercisable on the date of such termination or resignation,
        and (iv) extend the post-termination exercise period for all stock
        options granted to Li under the Company's stock option and other benefit
        plans so that all such stock options will be exercisable for a period of
        three months after the date of such termination or resignation (except
        that with respect to any stock options having a post-termination
        exercise period in excess of three months, such longer post-termination
        exercise period shall remain in effect).

                  For purposes of this subsection, the term "change in control"
        shall mean any change in control that the Company would be required to
        report in response to Item 5(f) of Schedule 14A of Regulation 14A
        promulgated under the Securities Exchange Act of 1934, as amended (the
        "Exchange Act"). Without limiting the foregoing, a change in control
        shall also be deemed to have occurred if (i) any "person" as defined in
        Section 13(d) and 14(d) of the Exchange Act is or becomes, directly or
        indirectly, the "beneficial owner" as defined in Rule 13 (d-3) under the
        Exchange Act of securities of the Company which represent 25% or more of
        the combined voting power of the Company's 


                                    Page 37
<PAGE>   4

        then outstanding securities; or (ii) during any period of two
        consecutive years, individuals who at the beginning of said two year
        period constituted the Board of Directors of the Company cease for any
        reason to constitute at least a majority of the Board unless the
        election or nomination of each new director was approved by a vote of at
        least two-thirds of the directors who were in office at the beginning of
        said two year period.

                  For purposes of this subsection, Li shall be deemed to have
        resigned "with good reason" if he does so following a change in control
        as a result of the Company having done any or all of the following
        without Li's express written consent: (i) assigned Li different duties
        or made changes in his reporting responsibilities, title, or office that
        are substantially inconsistent with Li's duties, responsibilities,
        titles, or offices immediately prior to the change in control; (ii)
        reduced Li's base salary from that in effect at the time of the change
        in control; (iii) failed to continue any bonus plan in substantially the
        same form as it existed prior to the change in control; (iv) required Li
        to be based more than fifty (50) miles from his present office location,
        except for required travel consistent with Li's present business travel
        obligations; (v) failed to continue any plan or program for
        compensation, employee benefits, stock purchase or ownership, life
        insurance, group medical, disability, or vacation in substantially the
        same form as immediately prior to the change in control, or otherwise
        made any material reduction in Li's fringe benefits, or (vi) failed to
        obtain the assumption of this Agreement by any successor to the Company.

                  Li shall not be entitled to the benefits of this Section 4(E)
        if this Agreement and his employment are terminated pursuant to Section
        4(A), (B) or (C).

                  F. Company's Obligations Under This Agreement Exclusive: The
        benefits set forth in subsections A through E above (which benefits, in
        the event of termination pursuant to subsections A, C, D or E, include
        payment for services rendered prior to termination as provided in such
        subsections), as applicable, constitute the sole obligations of the
        Company to Li upon a termination and are in lieu of any damages or other
        compensation that Li may claim under other Company policies in
        connection with this Agreement. The benefits on termination in this
        Agreement are in substitution for any severance or termination benefits
        otherwise available under Company policies of general application. Li
        expressly acknowledges that certain Company benefit or incentive plans
        provide for vesting in, or award of, benefits based on employment on or
        through particular dates and that nothing in this Agreement entitles him
        to partial vesting or partial awards under such plans. Any payments
        under Section 4D relating to any incentive or bonus plan are expressly
        acknowledged to be benefits under this Agreement and not an
        interpretation or modification of any such plan.

                  G. Resignation As Officer: In the event of any termination
        pursuant to this Section 4, Li shall be deemed to have resigned as an
        officer of the Company if he was serving in such capacity at the time of
        termination.

               5. Confidentiality: Li acknowledges and agrees that he has been
and will continue to be entrusted with trade and proprietary information
regarding the products, processes, methods of manufacture and delivery,
know-how, designs, formula, work in progress, research and development, computer
software and data bases, copyrights, trademarks, patents, marketing techniques,
and future business 


                                    Page 38
<PAGE>   5

plans, as well as customer lists and information concerning
the identity, needs, and desires of actual and potential customers of the
Company and its subsidiaries, joint venturers, partners, and other affiliated
persons and entities ("Confidential Information"), all of which derive
significant economic value from not being generally known to others outside the
Company.

                  A. During the entire term of his employment with the Company
        and for two years thereafter, Li shall not disclose or exploit any
        Confidential Information except for the sole benefit of the Company or
        with its express written consent.

                  B. During the entire term of his employment by the Company and
        for one year thereafter, Li shall not directly or indirectly solicit any
        actual or potential customer of the Company or its subsidiary and
        affiliated companies for any business that competes directly or
        indirectly with the Company, except for the sole benefit of the Company
        or with its express written consent.

                  C. During the entire term of his employment by the Company and
        for one year thereafter, Li shall not induce or attempt to induce any
        employee of the Company to leave the Company's employ except for the
        sole benefit of the Company or with its express written consent.

                  D. In the event any provision in this Section 5 is more
        restrictive than allowed by the law of any jurisdiction in which the
        Company seeks enforcement, such provision shall be deemed amended and
        shall then be fully enforceable to the extent permitted by such law.

                  E. Li acknowledges and agrees that any violation of this
        Section 5 would cause immediate irreparable damage to the Company, and
        that it would be extremely difficult or impossible to determine the
        amount of damage caused to the Company. Li therefore agrees that the
        Company's remedies at law are inadequate, and hereby consents to
        issuance of a temporary restraining order, preliminary and permanent
        injunction, and other appropriate relief to restrain any actual or
        threatened violation of this Section, without limiting any remedies the
        Company may have at law or in equity.

               6. Inventions: Any and all patents, copyrights, trademarks,
inventions, discoveries, developments, or trade secrets developed or perfected
by Li during or as the result of his employment with the Company shall
constitute the sole and exclusive property of the Company. Li shall disclose all
such matters to the Company, assign all right, title and interest he may have in
them, and cooperate with the Company in obtaining and perfecting any patent,
copyright, trademark, or other legal protection. This Section 6 shall not apply
to any invention which qualifies fully under California Labor Code Section 2870,
a true copy of which is attached to this Agreement as Exhibit A.

               7. Conflict Of Interest: During the term of this Agreement, Li
shall devote his time, ability, and attention to the business of the Company,
and shall not accept other employment or engage in any other outside business
activity which interferes with the performance of his duties and
responsibilities under this Agreement or which involves actual or potential
competition with the business of the Company, except with the express written
consent of the President.


                                    Page 39
<PAGE>   6

               8. Employee Benefit Plans: All of the employee benefit plans
referred to or contemplated by this Agreement shall be governed solely by the
terms of the underlying plan documents and by applicable law. Nothing in this
Agreement shall impair the Company's right to amend, modify, replace and
terminate any and all such plans in its sole discretion as provided by law, or
to terminate this Agreement in accordance with its terms. This Agreement is for
the sole benefit of Li and the Company, and is not intended to create an
employee benefit plan or to modify the term of existing plans.

               9. Parachute Limitation: The payments and benefits Li is entitled
to under this Agreement and all other contracts, arrangements, or programs shall
not, in the aggregate, exceed the maximum amount that may be paid to Li without
triggering golden parachute penalties under Section 280G and related provisions
of the Internal Revenue Code, as determined in good faith by the Company's
independent auditors. If Li's benefits must be cut back to avoid triggering such
penalties, Li's benefits shall be cut back in the priority order designated by
Li or, if Li fails promptly to designate an order, in the priority order
designated by the Company. If an amount in excess of the limit set forth in this
Section is paid to Li, Li must repay the excess amount to the Company upon
demand, with interest at the rate provided for in Internal Revenue Code Section
1274(b)(2)(B). Li and the Company agree reasonably to cooperate with each other
in connection with any administrative or judicial proceedings concerning the
existence or amount of golden parachute penalties with respect to payments or
benefits Li receives.

               10. Assignment: This Agreement may not be assigned by Li, but may
be assigned by the Company to any successor in interest to its business. In the
event the Company does not survive any merger, acquisition, or other
reorganization, it shall make a reasonable effort to obtain an assumption of
this Agreement by the surviving entity in such merger, acquisition, or other
reorganization, but the failure to obtain such assumption shall not prevent or
delay such merger, acquisition, or other reorganization or relieve the Company
of its other obligations under this Agreement. This Agreement shall bind and
inure to the benefit of the Company's successors and assigns, as well as Li's
heirs, executors, administrators, and legal representatives.

               11. Notices: All notices required by this Agreement may be
delivered by first class mail at the following addresses:

               To the Company:        Hycor Biomedical Inc.
                                      18800 Von Karman Avenue
                                      Irvine, California 92715

               To Li:                 Thomas M. Li
                                      6772 Findley Circle
                                      Huntington Beach, California 92648

               12. Amendment. This Agreement may be modified only by written
agreement signed by the party against whom any amendment is to be enforced.

               13. Choice Of Law: This Agreement shall be governed by the laws
of the State of California.

               14. Partial Invalidity: In the event any provision of this
Agreement is void or unenforceable, the remaining provisions shall continue in
full force and effect.


                                    Page 40
<PAGE>   7

               15. Waiver: No waiver of any breach of this Agreement shall
constitute a waiver of any subsequent breach.

               16. Complete Agreement: This Agreement contains the entire
agreement between the parties, and supersedes any and all prior and
contemporaneous oral and written agreements, including Li's previous employment
contracts, which shall have no further force and effect.

THOMAS M. LI


_____________________________                Dated: __________________

HYCOR BIOMEDICAL INC.


By:___________________________               Dated: __________________

   Name:  _____________________
   Title: _______________________



                                    Page 41
<PAGE>   8

                                    EXHIBIT A

                       CALIFORNIA LABOR CODE SECTION 2870

                   EMPLOYMENT AGREEMENTS; ASSIGNMENT OF RENTS

        (a) Any provision in an employment agreement which provides that an
employee shall assign, or offer to assign, any of his or her rights in an
invention to his or her employer shall not apply to an invention that the
employee developed entirely on his or her own time without using the employer's
equipment, supplies, facilities, or trade secret information except for those
inventions that either:

               (1) Relate at the time of conception or reduction to practice of
               the invention to the employer's business, or actual or
               demonstrably anticipated research or development of the employer;
               or

               (2) Result from any work performed by the employee for the
               employer.

        (b) To the extent a provision in an employment agreement purports to
require an employee to assign an invention otherwise excluded from being
required to be assigned under subdivision (a), the provision is against the
public policy of this state and is unenforceable.


                                    Page 42

<PAGE>   1

                                                                    EXHIBIT 10.5

                              EMPLOYMENT AGREEMENT
                              --------------------

               THIS EMPLOYMENT AGREEMENT ("Agreement") is made and entered into
by HYCOR BIOMEDICAL INC., a Delaware corporation ("Company"), and NELSON F.
THUNE ("Thune").

               WHEREAS, the Company desires to employ Thune in an executive
capacity, Thune desires to accept such employment, and the parties desire to
memorialize the terms and conditions of their employment relationship,

               NOW, THEREFORE, in consideration of the promises and covenants
set forth in this Agreement and for other valuable consideration, the parties
agree as follows:

               1. Employment: Thune shall be employed as a Vice President of the
Company reporting to the President, and shall faithfully and diligently perform
all duties and responsibilities required of such position or assigned by the
President from time to time, including service on behalf of the Company's
subsidiary and affiliated companies.

               2. Term. This Agreement and Thune's employment shall be for a
term of three (3) years commencing on June 20, 1997, and expiring on June 19,
2000, but shall be automatically renewed for successive one-year periods
thereafter unless either party gives written notice to the other party of
nonrenewal at least three (3) months in advance of the expiration date.

               3. Compensation: In consideration for all services to be
performed under this Agreement, Thune shall receive the following compensation:

                  A. Salary: Thune shall be paid base salary at the rate of One
        Hundred Sixty-One Thousand Seven Hundred Dollars ($161,700) per year.
        Annually, the Board of Directors, upon the recommendation of the
        President, shall review Thune's performance with a view toward
        increasing his salary.

                  B. Bonus: Thune shall be entitled to participate in the
        Company's Annual Executive Incentive Plan and the Long Term Executive
        Incentive Plan, subject to all of the terms and conditions set forth in
        said plans, as amended from time to time, as long as such plans remain
        in effect, and to participate in any successor or similar incentive plan
        available to management personnel of comparable status with the Company
        or its affiliates. Nothing herein or in said plans shall constitute a
        guarantee of Thune's employment by the Company, or a limitation on the
        Company's rights under this Agreement, or limitation on the Company's
        rights to amend or terminate any plan.

                  C. Employee Benefit Plans: Thune shall be entitled to
        participate in all employee benefit plans, including group medical,
        dental, visual, and life insurance, pension, profit sharing, group and
        individual disability income, stock option, vacation, and other benefit
        plans, on terms commensurate with the benefits awarded management
        personnel of comparable status with the Company or any affiliate of the
        Company, but subject, on any termination, to Section 4.E below.


                                    Page 43
<PAGE>   2

                  D. Expense Reimbursement: The Company shall reimburse Thune
        for all reasonable expenses that he necessarily incurs in connection
        with his employment and for which he presents adequate documentation in
        accordance with Company policies in effect from time to time.

               4. Termination: This Agreement and Thune's employment are subject
to immediate termination at any time as follows:

                  A. Death: This Agreement shall terminate immediately upon
        Thune's death, in which event the Company's only obligations shall be
        (i) to pay all compensation owing for services rendered by Thune prior
        to the date of his death; (ii) to continue paying Thune's base salary to
        his estate for a period of thirty (30) days after his death; and (iii)
        to make periodic recoverable advances to Thune's estate equivalent to
        Thune's base salary for ninety (90) days after said thirty (30) day
        period has lapsed, or until the proceeds from the life insurance policy
        on Thune's life referred to in this Agreement become available,
        whichever occurs first, with such advances to be repaid when said
        insurance proceeds become available.

                  B. Disability: In the event that Thune is disabled from
        performing his assigned duties under this Agreement due to illness or
        injury for a period in excess of one hundred eighty (180) days, the
        Company may place Thune on an unpaid leave of absence for a period not
        to exceed six (6) months, in which case the Company's only obligation
        shall be (i) to continue Thune's group medical and life insurance for
        the duration of the leave; (ii) to pay the bonus, if any, that Thune
        would be entitled to under the terms of the bonus plans referred to in
        Section 3B of this Agreement; and (iii) to allow Thune to continue
        receiving benefits under the disability insurance and other employee
        benefit plans in effect at the time of his disability in accordance with
        the terms and conditions of such plans. The granting of a leave of
        absence does not guarantee that Thune will be returned to employment,
        and the Company reserves the right to replace Thune or to take other
        action in his absence due to business necessity. If Thune is certified
        to return to work before his leave of absence expires, and desires to do
        so, the following provisions shall apply: (i) the Company will attempt
        to return Thune to his same or similar position, provided this does not
        result in undue hardship to the Company; and (ii) if the Company is
        unable to reinstate Thune because his position has been filled, then as
        a special severance benefit, the Company shall pay a lump-sum severance
        payment equal to twenty (20) months of Thune's base salary as in effect
        immediately prior to the commencement of Thune's leave of absence. If
        Thune is not certified to return to work before his leave of absence
        expires, or does not desire to return, his employment and this Agreement
        shall terminate upon the expiration of his leave of absence.

                  C. Termination For Cause: The Company may terminate this
        Agreement for cause immediately upon written notice to Thune in the
        event Thune (i) engages in any material misconduct, willful breach, or
        habitual neglect of his duties as an officer of the Company, or (ii) is
        finally convicted of a felony. In either event, the Company's sole
        obligation to Thune in lieu of all claims for compensation or damages
        shall be to pay all compensation owing for services rendered by Thune
        prior to the date of termination under this subsection.


                                    Page 44
<PAGE>   3

                  D. Termination Without Cause: The Company in its sole
        discretion may terminate this Agreement without cause or prior warning
        immediately upon written notice to Thune. For purposes of this Section
        4D, any failure to renew this Agreement and any resignation following a
        substantial reduction in Thune's salary, duties or responsibilities
        shall constitute an involuntary termination without cause. In the event
        of a termination under this Section 4D, the Company shall pay all
        compensation owing for services rendered by Thune prior to the date of
        termination, shall pay a lump-sum severance benefit equal to twelve (12)
        months of Thune's base salary at the time of termination, and shall
        continue to provide Thune at Company expense all medical, disability and
        insurance benefits available to him at the time of termination for a
        period of twelve (12) months after the termination or, if shorter, the
        maximum period allowed under the Company's policies as then in effect or
        under applicable law. As an additional severance payment, if the Company
        has in effect at the time of any termination without cause under this
        Section 4D any bonus or incentive plan which provides for awards in cash
        and is based on the Company's revenues or results of operations for a
        fiscal year, Thune shall be entitled to an amount equal to a pro rata
        award based on the period of the fiscal year for which he was employed
        if a termination under this Section 4D occurs after the completion of
        three fiscal quarters. Such severance shall be payable at the same time,
        and computed on the same terms, as awards under the plan in question,
        except for periods of service. Such payments and benefits shall not
        entitle Thune to any other benefits or compensation program available to
        Company employees.

                  E. Termination Following Change In Control: If either the
        Company elects to terminate Thune without cause pursuant to Section 4(D)
        within ninety (90) days before or twenty four (24) months after a change
        in control or Thune elects to resign with good reason within twenty four
        (24) months after a change in control of the Company, then as a
        severance benefit and in lieu of all compensation or damages the Company
        shall (i) pay Thune a lump sum equal to 200% of the average of the
        annual base salary plus bonuses paid to Thune during each of the three
        years prior to the time of such termination or resignation, (ii)
        continue to provide Thune at Company expense all medical, disability and
        insurance benefits available to him at the time of such termination or
        resignation for a period of twenty four (24) months after such
        termination or resignation, or, if shorter, the maximum period allowed
        under the Company's policies as then in effect or under applicable law,
        (iii) accelerate the vesting of all unvested stock options granted to
        Thune under the Company's stock option or other benefit plans so that
        all such stock options will vest and be fully exercisable on the date of
        such termination or resignation, and (iv) extend the post-termination
        exercise period for all stock options granted to Thune under the
        Company's stock option and other benefit plans so that all such stock
        options will be exercisable for a period of three months after the date
        of such termination or resignation (except that with respect to any
        stock options having a post-termination exercise period in excess of
        three months, such longer post-termination exercise period shall remain
        in effect).

                  For purposes of this subsection, the term "change in control"
        shall mean any change in control that the Company would be required to
        report in response to Item 5(f) of Schedule 14A of Regulation 14A
        promulgated under the Securities Exchange Act of 1934, as amended (the
        "Exchange Act"). Without limiting the foregoing, a change in control
        shall also be deemed to have occurred if (i) any "person" as defined in
        Section 13(d) and 14(d) of the Exchange Act is or becomes, directly or
        indirectly, the "beneficial owner" as 



                                    Page 45
<PAGE>   4

        defined in Rule 13 (d-3) under the Exchange Act of securities of the
        Company which represent 25% or more of the combined voting power of the
        Company's then outstanding securities; or (ii) during any period of two
        consecutive years, individuals who at the beginning of said two year
        period constituted the Board of Directors of the Company cease for any
        reason to constitute at least a majority of the Board unless the
        election or nomination of each new director was approved by a vote of at
        least two-thirds of the directors who were in office at the beginning of
        said two year period.

                  For purposes of this subsection, Thune shall be deemed to have
        resigned "with good reason" if he does so following a change in control
        as a result of the Company having done any or all of the following
        without Thune's express written consent: (i) assigned Thune different
        duties or made changes in his reporting responsibilities, title, or
        office that are substantially inconsistent with Thune's duties,
        responsibilities, titles, or offices immediately prior to the change in
        control; (ii) reduced Thune's base salary from that in effect at the
        time of the change in control; (iii) failed to continue any bonus plan
        in substantially the same form as it existed prior to the change in
        control; (iv) required Thune to be based more than fifty (50) miles from
        his present office location, except for required travel consistent with
        Thune's present business travel obligations; (v) failed to continue any
        plan or program for compensation, employee benefits, stock purchase or
        ownership, life insurance, group medical, disability, or vacation in
        substantially the same form as immediately prior to the change in
        control, or otherwise made any material reduction in Thune's fringe
        benefits, or (vi) failed to obtain the assumption of this Agreement by
        any successor to the Company.

                  Thune shall not be entitled to the benefits of this Section
        4(E) if this Agreement and his employment are terminated pursuant to
        Section 4(A), (B) or (C).

                  F. Company's Obligations Under This Agreement Exclusive: The
        benefits set forth in subsections A through E above (which benefits, in
        the event of termination pursuant to Subsections A, C, D or E, include
        payment for services rendered prior to termination as provided in such
        subsections), as applicable, constitute the sole obligations of the
        Company to Thune upon a termination and are in lieu of any damages or
        other compensation that Thune may claim under other Company policies in
        connection with this Agreement. The benefits on termination in this
        Agreement are in substitution for any severance or termination benefits
        otherwise available under Company policies of general application. Thune
        expressly acknowledges that certain Company benefit or incentive plans
        provide for vesting in, or award of, benefits based on employment on or
        through particular dates and that nothing in this Agreement entitles him
        to partial vesting or partial awards under such plans. Any payments
        under Section 4D relating to any incentive or bonus plan are expressly
        acknowledged to be benefits under this Agreement and not an
        interpretation or modification of any such plan.

                  G. Resignation As Officer: In the event of any termination
        pursuant to this Section 4, Thune shall be deemed to have resigned as an
        officer of the Company if he was serving in such capacity at the time of
        termination.

               5. Confidentiality: Thune acknowledges and agrees that he has
been and will continue to be entrusted with trade and proprietary information
regarding the 



                                    Page 46
<PAGE>   5

products, processes, methods of manufacture and delivery, know-how, designs,
formula, work in progress, research and development, computer software and data
bases, copyrights, trademarks, patents, marketing techniques, and future
business plans, as well as customer lists and information concerning the
identity, needs, and desires of actual and potential customers of the Company
and its subsidiaries, joint venturers, partners, and other affiliated persons
and entities ("Confidential Information"), all of which derive significant
economic value from not being generally known to others outside the Company.

                  A. During the entire term of his employment with the Company
        and for two years thereafter, Thune shall not disclose or exploit any
        Confidential Information except for the sole benefit of the Company or
        with its express written consent.

                  B. During the entire term of his employment by the Company and
        for one year thereafter, Thune shall not directly or indirectly solicit
        any actual or potential customer of the Company or its subsidiary and
        affiliated companies for any business that competes directly or
        indirectly with the Company, except for the sole benefit of the Company
        or with its express written consent.

                  C. During the entire term of his employment by the Company and
        for one year thereafter, Thune shall not induce or attempt to induce any
        employee of the Company to leave the Company's employ except for the
        sole benefit of the Company or with its express written consent.

                  D. In the event any provision in this Section 5 is more
        restrictive than allowed by the law of any jurisdiction in which the
        Company seeks enforcement, such provision shall be deemed amended and
        shall then be fully enforceable to the extent permitted by such law.

                  E. Thune acknowledges and agrees that any violation of this
        Section 5 would cause immediate irreparable damage to the Company, and
        that it would be extremely difficult or impossible to determine the
        amount of damage caused to the Company. Thune therefore agrees that the
        Company's remedies at law are inadequate, and hereby consents to
        issuance of a temporary restraining order, preliminary and permanent
        injunction, and other appropriate relief to restrain any actual or
        threatened violation of this Section, without limiting any remedies the
        Company may have at law or in equity.

               6. Inventions: Any and all patents, copyrights, trademarks,
inventions, discoveries, developments, or trade secrets developed or perfected
by Thune during or as the result of his employment with the Company shall
constitute the sole and exclusive property of the Company. Thune shall disclose
all such matters to the Company, assign all right, title and interest he may
have in them, and cooperate with the Company in obtaining and perfecting any
patent, copyright, trademark, or other legal protection. This Section 6 shall
not apply to any invention which qualifies fully under California Labor Code
Section 2870, a true copy of which is attached to this Agreement as Exhibit A.

               7. Conflict Of Interest: During the term of this Agreement, Thune
shall devote his time, ability, and attention to the business of the Company,
and shall not accept other employment or engage in any other outside business
activity which interferes with the performance of his duties and
responsibilities under this Agreement 


                                    Page 47
<PAGE>   6

or which involves actual or potential competition with the business of the
Company, except with the express written consent of the President.

               8. Employee Benefit Plans: All of the employee benefit plans
referred to or contemplated by this Agreement shall be governed solely by the
terms of the underlying plan documents and by applicable law. Nothing in this
Agreement shall impair the Company's right to amend, modify, replace and
terminate any and all such plans in its sole discretion as provided by law, or
to terminate this Agreement in accordance with its terms. This Agreement is for
the sole benefit of Thune and the Company, and is not intended to create an
employee benefit plan or to modify the term of existing plans.

               9. Parachute Limitation: The payments and benefits Thune is
entitled to under this Agreement and all other contracts, arrangements, or
programs shall not, in the aggregate, exceed the maximum amount that may be paid
to Thune without triggering golden parachute penalties under Section 280G and
related provisions of the Internal Revenue Code, as determined in good faith by
the Company's independent auditors. If Thune's benefits must be cut back to
avoid triggering such penalties, Thune's benefits shall be cut back in the
priority order designated by Thune or, if Thune fails promptly to designate an
order, in the priority order designated by the Company. If an amount in excess
of the limit set forth in this Section is paid to Thune, Thune must repay the
excess amount to the Company upon demand, with interest at the rate provided for
in Internal Revenue Code Section 1274(b)(2)(B). Thune and the Company agree
reasonably to cooperate with each other in connection with any administrative or
judicial proceedings concerning the existence or amount of golden parachute
penalties with respect to payments or benefits Thune receives.

               10. Assignment: This Agreement may not be assigned by Thune, but
may be assigned by the Company to any successor in interest to its business. In
the event the Company does not survive any merger, acquisition, or other
reorganization, it shall make a reasonable effort to obtain an assumption of
this Agreement by the surviving entity in such merger, acquisition, or other
reorganization, but the failure to obtain such assumption shall not prevent or
delay such merger, acquisition, or other reorganization or relieve the Company
of its other obligations under this Agreement. This Agreement shall bind and
inure to the benefit of the Company's successors and assigns, as well as Thune's
heirs, executors, administrators, and legal representatives.

               11. Notices: All notices required by this Agreement may be
delivered by first class mail at the following addresses:

               To the Company:        Hycor Biomedical Inc.
                                      18800 Von Karman Avenue
                                      Irvine, California 92715

               To Thune:              Nelson F. Thune
                                      14 Brentano
                                      Coto de Caza, California 92679

               12. Amendment. This Agreement may be modified only by written
agreement signed by the party against whom any amendment is to be enforced.

               13. Choice Of Law: This Agreement shall be governed by the laws
of the State of California.


                                    Page 48
<PAGE>   7

               14. Partial Invalidity: In the event any provision of this
Agreement is void or unenforceable, the remaining provisions shall continue in
full force and effect.

               15. Waiver: No waiver of any breach of this Agreement shall
constitute a waiver of any subsequent breach.

               16. Complete Agreement: This Agreement contains the entire
agreement between the parties, and supersedes any and all prior and
contemporaneous oral and written agreements, including Thune's previous
employment contracts, which shall have no further force and effect.

NELSON F. THUNE

                                                               Dated:___________

HYCOR BIOMEDICAL INC.

By:_____________________________                               Dated:___________

   Name:________________________
   Title:_______________________


                                    Page 49
<PAGE>   8

                                    EXHIBIT A

                       CALIFORNIA LABOR CODE SECTION 2870

                   EMPLOYMENT AGREEMENTS; ASSIGNMENT OF RENTS

        (a) Any provision in an employment agreement which provides that an
employee shall assign, or offer to assign, any of his or her rights in an
invention to his or her employer shall not apply to an invention that the
employee developed entirely on his or her own time without using the employer's
equipment, supplies, facilities, or trade secret information except for those
inventions that either:

               (1) Relate at the time of conception or reduction to practice of
               the invention to the employer's business, or actual or
               demonstrably anticipated research or development of the employer;
               or

               (2) Result from any work performed by the employee for the
               employer.

        (b) To the extent a provision in an employment agreement purports to
require an employee to assign an invention otherwise excluded from being
required to be assigned under subdivision (a), the provision is against the
public policy of this state and is unenforceable.

                                    Page 50

<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM UNAUDITED
CONDENSED CONSOLIDATED FINANCIAL STATEMENTS AS OF AND FOR THE NINE MONTHS ENDED
SEPTEMBER 30, 1997 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FORM 10
FOR THE QUARTER ENDED SEPTEMBER 30, 1997
</LEGEND>
       
<S>                             <C>
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-START>                             JAN-01-1997
<PERIOD-END>                               SEP-30-1997
<CASH>                                         662,565
<SECURITIES>                                 2,009,006
<RECEIVABLES>                                3,133,934
<ALLOWANCES>                                    76,934
<INVENTORY>                                  4,306,588
<CURRENT-ASSETS>                            11,980,546
<PP&E>                                      12,543,636
<DEPRECIATION>                               7,397,883
<TOTAL-ASSETS>                              22,538,136
<CURRENT-LIABILITIES>                        3,109,831
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                                          0
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<OTHER-EXPENSES>                            11,951,434
<LOSS-PROVISION>                                     0
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<INCOME-PRETAX>                            (4,158,493)
<INCOME-TAX>                                 (349,818)
<INCOME-CONTINUING>                        (3,808,675)
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