THERMO SENTRON INC
8-K/A, 1998-08-27
GENERAL INDUSTRIAL MACHINERY & EQUIPMENT
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                     SECURITIES AND EXCHANGE COMMISSION

                           Washington, D.C. 20549

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


                       AMENDMENT NO. 1 ON FORM 8-K/A

                               CURRENT REPORT



                     Pursuant to Section 13 or 15(d) of
                    the Securities Exchange Act of 1934



                               Date of Report 
                      (Date of earliest event reported):

                               June 12, 1998

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


                            THERMO SENTRON INC.
           (Exact name of Registrant as specified in its charter)


Delaware                         1-14254                          41-1827303
(State or other               (Commission                   (I.R.S. Employer
jurisdiction of               File Number)           Identification Number)
incorporation or organization)


501 90th Avenue N.W.
Minneapolis, Minnesota                                              55433
(Address of principal executive offices)                          (Zip Code)


                               (781) 622-1000
                       (Registrant's telephone number
                            including area code)



<PAGE>


                                                                  FORM 8-K/A


Item 2. Acquisition or Disposition of Assets

    On June 12, 1998, Thermo Sentron Inc. (the Company) acquired the three
businesses that constitute the Graseby product-monitoring group (Graseby Product
Monitoring) from Graseby Limited (the Seller). The businesses acquired design,
manufacture, and distribute specialized packaged-goods equipment, including
checkweighers and metal detectors, primarily for use by food producers and
pharmaceutical companies.

    The acquisition was made pursuant to an Agreement dated March 13, 1998 (as
amended, the Agreement), between the Seller, the Company, and Thermo
Environmental Instruments Inc., which acquired a separate business of the
Seller. Smiths Industries plc, the parent company of the Seller, and Thermo
Electron Corporation, the indirect parent company of the Company and of Thermo
Environmental Instruments Inc., guaranteed the respective obligations of the
parties.

    The purchase price of Graseby Product Monitoring was approximately $44
million, net of cash acquired. The purchase price is subject to a post-closing
adjustment equal to the amount by which the net operating assets (excluding cash
balances and certain other identified items) of Graseby Product Monitoring as of
the closing date are greater or less than, as the case may be, certain target
amounts set forth in the Agreement.

    The consideration paid for Graseby Product Monitoring was based on the
Company's determination of the fair market value of Graseby Product Monitoring's
business, and the terms of the Agreement were determined by arms-length
negotiation among the parties.

    To partially finance the acquisition, the Company borrowed $21.0 million
from Thermo Electron. The indebtedness to Thermo Electron bears interest at a
rate equal to the 90-day Commercial Paper Composite Rate plus 25 basis points,
set at the beginning of each quarter, and is due December 15, 1998.

    The Company has no present intention to use the assets of Graseby Product
Monitoring for purposes materially different from the purposes for which such
assets were used prior to the acquisition. However, the Company will review such
business's assets, corporate structure, capitalization, operations, properties,
policies, management and personnel and, upon completion of this review, may
develop additional or alternative plans or proposals, including mergers,
transfers of a material amount of assets or other additional transactions or
changes relating to such business.



                                       2
<PAGE>

Item 7.  Financial Statements, Pro Forma Combined Condensed Financial
         Information and Exhibits

    (a)  Financial Statements of Business Acquired: Attached hereto
                                       3
<PAGE>

                            PRODUCT MONITORING GROUP

                               TABLE OF CONTENTS

                                                                     Page Number


Auditors' Report                                                               2

Combined Profit and Loss Account                                               3

Combined Balance Sheet                                                         4

Combined Statement of Cash Flows                                               5

Notes to the Combined Accounts                                                 6
<PAGE>
                            PRODUCT MONITORING GROUP

                         REPORT OF INDEPENDENT AUDITORS


To the Board of Directors of Product Monitoring Group

We have audited the accompanying combined balance sheet of the Product
Monitoring Group and its subsidiaries ("the Company") as of 1 October 1997 and
the related combined profit and loss account, and combined statement of cash
flows for the nine month period then ended, all expressed in British pounds
sterling and prepared on the basis set forth in Note 1 to the combined financial
statements. These financial statements set out on pages 3 through 21 are the
responsibility of the Company's management. Our responsibility is to express an
opinion on these financial statements based on our audits.

We conducted our audit in accordance with United Kingdom generally accepted
auditing standards which do not differ in any material respect from auditing
standards generally accepted in the United States. Those standards require that
we plan and perform the audit to obtain reasonable assurance about whether the
financial statements are free of material misstatement. An audit includes
examining, on a test basis, evidence supporting the amounts and disclosures in
the financial statements. An audit also includes assessing the accounting
principles used and significant estimates made by management, as well as
evaluating the overall financial statement presentation. We believe that our
audits provide a reasonable basis for our opinion.

In our opinion, the combined financial statements referred to above present
fairly, in all material respects, the financial position of the Company as of 1
October 1997 and the result of the Company's operations and its cash flows for
the nine month period then ended in conformity with generally accepted
accounting principles in the United Kingdom.

Accounting principles generally accepted in the United Kingdom differ in certain
significant respects from accounting principles generally accepted in the United
States. The application of the latter would have affected the determination of
the combined loss for the nine month period ended 1 October 1997 and the
determination of combined financial position as of 1 October 1997. Note 27 to
the combined financial statements summarizes this effect for the nine month
period ended 1 October 1997.



PricewaterhouseCoopers
London, England

24 August 1998

                                       2
<PAGE>
                            PRODUCT MONITORING GROUP

                        COMBINED PROFIT AND LOSS ACCOUNT
                   For the nine months ended 1st October 1997

                                                                      Continuing
                                                                      Operations
                                                                     9 Months to
                                                                  1 October 1997
                                       (In thousands of British pounds sterling)
Notes

  4     TURNOVER                                                         20,766

        Cost of Sales                                                   (12,371)
                                                                        -------
        Gross Profit                                                      8,395
        Other Operating Income                                                -
                                                                        -------
                                                                          8,395
  2     Operating expenses                                               (8,384)
                                                                        -------

        OPERATING PROFIT                                                     11

  3     Net interest                                                         69
                                                                        -------

        PROFIT ON ORDINARY ACTIVITIES BEFORE TAXATION                        80

  6     Tax on profit on ordinary activities                               (359)
                                                                        -------
        LOSS ON ORDINARY ACTIVITIES AFTER TAXATION                         (279)

 21     Dividend Paid                                                         -
                                                                        -------
        RETAINED LOSS                                                      (279)
                                                                        =======

        The loss for 1997 is stated on the historical cost basis.

        Thereis no  difference  between the loss on  ordinary  activities
        before  taxation and the retained loss for the period stated above and
        their historical cost equivalent.

        STATEMENT OF TOTAL RECOGNIZED GAINS AND LOSSES

                                       (In thousands of British pounds sterling)

        Loss for the financial period                                      (279)
        Currency translation differences of foreign currency
          net investments                                                   137
                                                                        -------
        Total recognized gains and losses relating to the period           (142)
                                                                        =======


The notes on pages 6 to 21 form an integral part of these accounts.
                                       3
<PAGE>

                            PRODUCT MONITORING GROUP

                   COMBINED BALANCE SHEET at 1st October 1997

                                                                  1 October 1997
Notes                                  (In thousands of British pounds sterling)

        FIXED ASSETS
   7    Tangible assets                                                   1,102
  22    Investments                                                           3
                                                                         ------
                                                                          1,105
                                                                         ------
        CURRENT ASSETS
   8    Stocks                                                            4,810
   9    Debtors  - amounts falling due within one year                    4,906 
                 - amounts falling due after more than one year           3,514
        Cash at bank and in hand                                          2,395
                                                                         ------
                                                                         15,625
  10    Creditors - amounts falling due within one year                  (5,690)
  11    Provision for liabilities and charges                              (187)
                                                                         ------
        NET CURRENT ASSETS                                                9,748
                                                                         ------
        TOTAL ASSETS LESS CURRENT LIABILITIES                            10,853
                                                                         ======
        CAPITAL & RESERVES
  13    Combined share capital                                            1,471
  14    Share premium account                                             3,575
  23    Profit and loss account                                           4,287
                                                                         ------
        EQUITY SHAREHOLDERS FUNDS                                         9,333
  25    Non-equity shareholders funds                                     1,520
                                                                         ------
        TOTAL SHAREHOLDERS FUNDS                                         10,853
                                                                         ======

The report of the auditors is on page 2.

The notes on pages 6 to 21 form an integral part of these accounts.

                                       4
<PAGE>
                            PRODUCT MONITORING GROUP

           COMBINED STATEMENT OF CASH FLOWS THROUGH 1st October 1997

                                                                  1 October 1997
Notes                                  (In thousands of British pounds sterling)

24(a)     Net Cash Flow from Operating Activities                           131

        Returns on Investments and Servicing of
          Finance:
        Interest Received                                                    69
                                                                         ------
          Net Cash Inflow for Returns on Investments                         69

        Taxation:                                                          (764)

        Capital Expenditure and Financial Investment:
        Purchase of Tangible Fixed Assets                                  (481)
        Sale of Plant and Machinery                                           7
                                                                         ------

          Net Cash Outflow for Capital Expenditure and
            Financial Investment                                           (474)
                                                                         ------
        Cash Outflow Before Use of Liquid Resources
          and Financing                                                  (1,038)

        Management of Liquid Resources:
        Increase in Long-term Receivables                                  (544)

        Financing-Debt Due Within One Year:
        Increase in Short-term Borrowings                                 1,090
                                                                         ------
24(b)   Decrease in Cash in the Period                                     (492)
                                                                         ======


                                       5
<PAGE>
                            PRODUCT MONITORING GROUP

                         NOTES TO THE COMBINED ACCOUNTS

1.BUSINESS OPERATIONS, BASIS OF PRESENTATION AND PRINCIPAL ACCOUNTING
        POLICIES

The combined financial statements have been prepared in accordance with
applicable accounting standards in the United Kingdom. A summary of the more
important accounting policies, which have been applied consistently, is set out
below.

a)      Business Operations and basis of presentation

               These combined  financial  statements were prepared in connection
          with the acquisition of the checkweighing,  metal detection, x-ray and
          coding  businesses  of Graseby  plc  (collectively  referred to as the
          "Product  Monitoring  Group" or the  "Company")  purchased from Smiths
          Industries  plc  ("Smiths")  by Thermo  Sentron Inc.  ("Thermo").  The
          Company was  acquired by Smiths on 2 October 1997 upon  completion  of
          its  acquisition  of Graseby  plc.  On 12 June 1998,  the  Company was
          acquired from Smiths by Thermo.

               The   principal   activities  of  the  Company  are  the  design,
          manufacture and sale of contact coding products used to print variable
          information onto products and packaging,  and the design,  manufacture
          and  sale of  equipment  and  systems  principally  used  by food  and
          pharmaceutical  producers  to  identify  and  reject  contaminated  or
          irregular products.

               These combined financial  statements reflect the combined balance
          sheet,  profit and loss  account  and  statement  of cash flows of the
          Company  for the nine months  ended 1 October  1997.  All  significant
          intercompany transactions are eliminated in combination. The financial
          statements of the Companies'  businesses are  denominated in the local
          foreign   currency  as  the  designated   functional   currency.   The
          businesses'  assets and  liabilities  have been  translated  to pounds
          sterling at the respective  exchange  rates  prevailing at the balance
          sheet  date.  The  businesses'  profit  and loss  accounts  have  been
          translated at the respective average exchange rates for the year.

        b)      Accounting convention

               The accounts have been prepared in accordance with the historical
          cost convention.

        c)      Foreign currency

               Exchange  profits less losses resulting from the period's trading
          are accounted for in the result for the period.

               Assets  and  liabilities  expressed  in  foreign  currencies  are
          translated  to sterling at rates of exchange  ruling at the end of the
          financial period or at forward rates where covered by forward exchange
          contracts.


                                       6
<PAGE>

                   NOTES TO THE COMBINED ACCOUNTS (continued)

        d)      Fixed assets

               Fixed assets are stated at historical cost less depreciation.

        e)      Depreciation

               Depreciation of fixed assets is provided on a straight line basis
          at such rates  that will  write off the cost of the assets  over their
          expected useful working lives.

               The principal annual rates used for this purpose are:

            Plant and machinery             10% to 33% on cost
            Fixtures and fittings           10% to 33% on cost
            Motor vehicles                  25% to 33% on cost
            Long leasehold property         over the period to the
                                            next rent review
           Leasehold additions             5% to 20% on cost

        f)      Stocks

               Stock and work in  progress  are  stated at the lower of cost and
          net realizable value, with provision being made, where necessary,  for
          obsolete,  slow-moving and defective stocks. Cost is determined on the
          first in first out  basis  and  includes  material,  direct  labor and
          overheads  appropriate  to  the  relevant  stage  of  production.  Net
          realizable  value  represents the estimated amount at which stocks and
          work in progress will be realized  after taking into account  relevant
          marketing, selling and distribution costs.

        g)      Debtors

               Debtors are stated after making such  provision as is  considered
          necessary to cover the risk of bad debts.

        h)      Deferred taxation

               No provision is made or asset  recognized  for deferred  taxation
          unless,  in  the  opinion  of the  directors,  there  is a  reasonable
          probability   that  the  relevant  amount  will   crystallise  in  the
          foreseeable future.

        i) Research and development

               All expenditure for research and development is charged to profit
          and  loss  account  as  incurred.   


                                       7
<PAGE>

                   NOTES TO THE COMBINED ACCOUNTS (continued)

        j)      Pension scheme arrangements

               The company  participates  in a group pension scheme  operated by
          Graseby  plc.  Contributions  and  pension  costs are based on pension
          costs across the group as a whole.  Pension costs are accounted for on
          the basis of charging in each  accounting  period,  the regular  cost,
          i.e.  the  consistent  ongoing  costs of providing  pensions  over the
          period during which the company benefits from the employees' services,
          adjusted for any variations in cost arising from the experience of the
          scheme.  The effects of  variations  from regular cost are spread over
          the expected remaining working lifetime of members of the scheme.

2.      OPERATING EXPENSES
                                                                     9 Months to
                                                                  1 October 1997
                                       (In thousands of British pounds sterling)

        Net operating expenses comprise:-                        
          Distribution costs                                              3,429
          Administration expenses                                         4,955
                                                                          -----
                                                                          8,384
                                                                         ======

3.      NET INTEREST RECEIVABLE/(PAYABLE) AND SIMILAR INCOME
                                                                     9 Months to
                                                                  1 October 1997
                                       (In thousands of British pounds sterling)

        Interest (Payable)/Receivable                                        69
                                                                         ======

4.      TURNOVER & PROFIT ON ORDINARY ACTIVITIES BEFORE TAXATION

                                                                     9 Months to
                                                                  1 October 1997
                                       (In thousands of British pounds sterling)

        The geographical split of turnover in the year was
        as follows:-
        United Kingdom                                                    6,819
        Rest of Europe                                                    4,033
        U.S.A.                                                            6,185
        Canada                                                            2,096
        Other overseas countries                                          1,633
                                                                        -------
                                                                         20,766
                                                                        =======

                                       8
<PAGE>

                   NOTES TO THE COMBINED ACCOUNTS (continued)

        The geographical  split of profit on ordinary  activities  before
        tax in the year was as follows:

        United Kingdom                                                     (852)
        Rest of Europe                                                     (255)
        U.S.A.                                                              878
        Canada                                                              303
        Other overseas countries                                              6
                                                                        -------
                                                                             80 
                                                                        =======
        The geographical split of net assets at the end of the year was as 
        follows:

        United Kingdom                                                    7,182
        Rest of Europe                                                     (522)
        U.S.A.                                                            2,901
        Canada                                                            1,110
        Other overseas countries                                            182
                                                                        -------
                                                                         10,853
                                                                        =======

        Loss on ordinary activities has been arrived at after charging:
        Depreciation of fixed assets                                        396 
        Auditors' remuneration for audit work                               101
        Operating lease rentals:
          - plant, machinery and vehicles                                   274
          - land and buildings                                              213

        The split of turnover between product lines was as follows:

        Turnover - Product Inspection                                    17,533
        Turnover - Coding Equipment                                       3,233 
                                                                         ------
                                                                         20,766
                                                                         ======
        The split of profit on ordinary activities before tax between product
        lines was as follows:

        Loss Before Tax - Product Inspection                               (379)
        Profit Before Tax - Coding Equipment                                459
                                                                         ------
                                                                             80
                                                                         ======

        The split of net assets between product lines was as follows:

        Net Assets - Product Inspection                                   9,426
        Net Assets - Coding Equipment                                     1,427
                                                                         ------
                                                                         10,853
                                                                         ======

                                       9
<PAGE>

                   NOTES TO THE COMBINED ACCOUNTS (continued)

5.      DIRECTORS AND OTHER EMPLOYEES

               All  directors  have been employed as managers by Graseby plc and
          are  remunerated  by that company in respect of their  services to the
          group as a whole.  They  receive  no  emoluments  from  this  Company,
          although  Graseby  plc makes a charge to the  company  in  respect  of
          management  and other  services,  which  charge is  included  in these
          accounts.

        Directors' Emoluments:

                                                                     9 Months to
                                                                  1 October 1997
                                       (In thousands of British pounds sterling)

        Emoluments for services as directors to the
          Product Monitoring Group paid by another
          group undertaking (excluding pension contributions)               231
        Company contributions                                                 -
                                                                            ---
        Company contribution to defined benefit scheme                      231
                                                                            ===

               Excluding  pension  contributions,  the emoluments of the highest
          paid director were 57,666 British pounds sterling.

               There are 11 directors for whom retirement  benefits are accruing
          in the defined benefit scheme referred to in note 15.

               The average number of persons,  including directors,  employed by
          the Company during the period was as follows:

                                                                     9 Months to
                                                                  1 October 1997
                                                                          Number
        Production                                                          205
        Selling, Distribution and Administration                            128
                                                                          -----
                                                                            333
                                                                          =====

                                                                     9 Months to
                                                                  1 October 1997
                                       (In thousands of British pounds sterling)
       
        Staff Costs:            
        Wages and salaries                                                4,670
        Social security costs                                               392
        Other pension costs                                                 184
                                                                          -----
                                                                          5,246
                                                                          =====

                                       10
<PAGE>

                   NOTES TO THE COMBINED ACCOUNTS (continued)

6.      TAX ON PROFIT ON ORDINARY ACTIVITIES
                                                                     9 Months to
                                                                  1 October 1997
                                       (In thousands of British pounds sterling)

        Corporation tax based on profits for the period
        at 31.67%                                                           (25)
        Deferred taxation                                                  (334)
                                                                           ----
                                                                           (359)
                                                                            ====

7       TANGIBLE ASSETS
                                                  Short    Fixtures,
                             Long leasehold   leasehold      plant &
                                  buildings   buildings     vehicles   Total
                                (In thousands of British pounds sterling)

        Cost:
        At 31st December 1996           531          53        2,706   3,290
        Additions                         -           3          478     481
        Disposal                          -           -         (413)   (413)
                                      -----       -----        -----   -----
        At 1st October 1997             531          56        2,771   3,358
                                      -----       -----        -----   -----

        Depreciation:
        At 31st December 1996           367          32        1,855   2,254
        Charge for period                45           7          344     396
        Disposals                         -           -         (394)   (394)
                                      -----       -----        -----   -----
        At 1st October 1997             412          39        1,805   2,256
                                      -----       -----        -----   -----
        Net book value:
        At 1st October 1997             119          17          966   1,102
                                      =====       =====        =====   =====
        At 31st December 1996           164          21          851   1,036
                                      =====       =====        =====   =====

8.      STOCKS AND WORK IN PROGRESS
                                                                  1 October 1997
                                       (In thousands of British pounds sterling)

Raw materials and consumables                                             1,959
Work in progress                                                            701
Finished goods                                                            2,150
                                                                          -----
                                                                          4,810
                                                                          =====

                                       11
<PAGE>

NOTES TO THE COMBINED ACCOUNTS (continued)

9.      DEBTORS
                                                                  1 October 1997
                                       (In thousands of British pounds sterling)

        Amounts recoverable within one year:
        Trade debtors                                                     4,379
        Prepayments and accrued income                                      527
                                                                          -----
                                                                          4,906
                                                                          =====
        Amounts recoverable after one year:
        Group Loans:
        Immediate holding company                                         3,514
                                                                          =====

               The  directors  regard the Group  Loans as long term in nature as
          there is no fixed repayment  date,  although the balance may fluctuate
          in the  short  term.  Of the  balance  outstanding  at the  end of the
          financial  period,  305,000  British  pounds  sterling bears a finance
          charge varying with market rates.

10.     CREDITORS - amounts falling due within one year 1 October 1997 (In
        thousands of British pounds sterling)

        Bank overdraft                                                    1,619
        Trade creditors                                                   2,801
        Accruals and deferred income                                        908
        Social security and other taxes payable                              47
        Corporate tax payable                                               315
                                                                          -----
                                                                          5,690
                                                                          =====

               The bank  overdraft  is  secured by cross  guarantees  from other
          participating companies in the joint bankers arrangements.

11.     PROVISION FOR LIABILITIES AND CHARGES 
        Includes the following:
                              Restructuring    Warranty
                                      Costs       Costs        Total
        (In thousands of British pounds sterling)

        At 31st December 1996            70          98          168
        Profit and Loss Account          (3)         22           19
                                        ---         ---          ---
        At 1st October 1997              67         120          187
                                        ===         ===          ===

                                       12
<PAGE>

                   NOTES TO THE COMBINED ACCOUNTS (continued)

12.     DEFERRED TAXATION

               The  potential  liability to deferred tax,  calculated  under the
          liability  method  together  with the element for which  provision has
          been recognized or made in the accounts, is analyzed below.

                                                     1 October 1997
                                                   Full   Recognized
                                              Potential  in accounts 
                                               (asset)/ 
                                              liability
                                       (In thousands of British pounds sterling)

        Accelerated capital allowances            (156)            -
        Other short-term timing
          differences                             (253)            -
                                                  ----          ----
                                                  (409)            -
                                                  ====          ====
13.     COMBINED SHARE CAPITAL

             The combined share capital represents the aggregate share capital
        of the companies in the Product Monitoring Group, as follows:

        -Graseby Product Monitoring Limited 
        -Graseby Allen Limited 
        -Graseby Goring Kerr GmbH
        -Graseby Goring Kerr (NZ) Limited 
        -Goring Kerr Detection Limited 
        -Graseby Goring Kerr (Canada) Inc.

14.     SHARE PREMIUM ACCOUNT

                                       (In thousands of British pounds sterling)

        At 1 October 1997 and 31 December 1996                            3,575
                                                                          =====

               This  represents  the share  premium  account in Graseby  Product
          Monitoring Limited.

15.     PENSION COMMITMENTS

               The  Company  participated  in a group  defined  benefit  pension
          scheme.  The funds of the Graseby scheme are  administered by trustees
          and are  separate  from the group.  The funds are valued  every  three
          years by professionally  qualified independent actuaries, the rates of
          contribution  being  determined by the actuaries.  In the  intervening
          years the  actuaries  review  the  continuing  appropriateness  of the
          rates.  The latest  actuarial  valuation  of the scheme was 31st March
          1994.

               The total pension cost for the company was 187,000 British pounds
          sterling.  This represents  contributions  payable to Graseby plc, who
          are  responsible  for making  contributions  to the  pension  funds on
          behalf of the group as a whole.

                                       13
<PAGE>

                   NOTES TO THE COMBINED ACCOUNTS (continued)

16.     LEASE COMMITMENTS

               The Company has annual  commitments under  non-cancelable  leases
          having expiry periods as follows:

                                                  1 October 1997
                                               Land and
                                              Buildings      Other
                          (In thousands of British pounds sterling)

        Within one year                             40          77
        Between one & five years                   210         276
        After five years                           347           6
                                                   ---         ---
                                                   597         359
                                                   ===         ===

17.     CONTINGENT LIABILITIES

        a) The Company has a contingent liability, under a composite cross
           guarantee structure with other companies in the group, in respect
           of banking facilities. At the year end there were no such 
           liabilities.

        b) The Company is registered with H.M. Customs and Excise as a member
           of a group for VAT purposes, resulting in a joint and several
           liability on a continuing basis for amounts owing by the remainder
           of the group for unpaid VAT.

        There are no other known claims at the balance sheet date not provided
        for in these financial statements.

18.     COMMITMENTS FOR CAPITAL EXPENDITURE
                                                                  1 October 1997
                                       (In thousands of British pounds sterling)

                Capital expenditure authorized and
                  contracted for but not provided                            34
                Capital expenditure authorized for
                  which contracts have not been placed                        -
                                                                             --
                                                                             34
                                                                             ==
19.     RELATED PARTY TRANSACTIONS

               There were no transactions during the period with related parties
          as defined in financial  reporting  standard  number 8 ("FRS8")  other
          than with fellow group  companies.  As the Company is owned as to more
          than 90% by the ultimate  holding company it is exempt under FRS8 from
          the obligation to disclose transactions with fellow group companies.

20.     ULTIMATE HOLDING COMPANY

               At the balance sheet date the Company's  ultimate holding company
          was Graseby plc,  incorporated in England and Wales. On 2nd October an
          offer by Smiths  Industries  plc for all the issued  share  capital of
          Graseby plc was declared  unconditional  with acceptances in excess of
          90%. Accordingly,  Smith Industries plc, which is also incorporated in
          England and Wales was the ultimate holding company until 12 June 1998,
          at which point Thermo Sentron Inc. purchased the Company.

                                       14
<PAGE>

                   NOTES TO THE COMBINED ACCOUNTS (continued)

21.     DIVIDENDS PAID
                                                   Per Share          Amount
                                                 9 Months to     9 Months to
                                              1 October 1997  1 October 1997
                                    (In thousands of British pounds sterling)
        Dividend on ordinary
        equity shares:-
        
        Interim                                            -               -
                                                 -----------     -----------  
        Final                                              -               -
                                                 -----------     -----------  
                                                           -               -
                                                 -----------     -----------  

        Dividend on non-equity
        redeemable shares:-
        Interim                                            -               -
                                                 -----------     -----------  
        Final                                              -               -
                                                 -----------     -----------  
                                                           -               -
                                                 -----------     -----------  
        Total                                              -               -
                                                 -----------     -----------  

22.     INVESTMENTS
                                                       Other Investments
                                (In thousands of British pounds sterling)
        Valuation                                                      3
        At 31 December 1996                                            -
        Additions                                                      -
        Disposals                                                      -
                                                                      --
        At 1 October 1997                                              3
                                                                      ==

               The  Group  has a 33%  interest  in  Svenska  Allen AB  (Sweden).
          Svenska  Allen  AB  acts  as  a  distributor   for  the  Allen  Coding
          operations.  The Board does not exercise  significant  influence  over
          this  investment  and it is valued at a cost of 3,000  British  pounds
          sterling.

23.     MOVEMENT ON RESERVES
                                                                  1 October 1997
                                       (In thousands of British pounds sterling)

        Profit and loss account
        At 31 December 1996                                               4,429
        Loss for the period                                                (279)
        Currency translation differences on foreign
         currency net investments                                           137
                                                                        -------
        At 1 October 1997                                                 4,287
                                                                        =======
24.     CASH FLOW DISCLOSURES

        a)  Reconciliation of Operating Profit to Net Cash Inflow

        Cash Flow from Operating Activities:
        Operating Profit                                           11
        Depreciation Charges                                      396
        Increase in Stocks                                       (178)
        Decrease in Debtors                                       231
        Decrease in Creditors                                    (329)
                                                                -----
        Net Cash Inflow from Operating Activities                 131
                                                                =====
                                       15
<PAGE>
                   NOTES TO THE COMBINED ACCOUNTS (continued)

        b)Reconciliation  of Net Cash Flow  Movement  to  Movement in Net
          Funds

        Reconciliation of Net Cash Flow to Movement
          in Net Funds:
        Decrease in Cash in the Period                            (492)
        Cash Inflow from Increase in Short-term Borrowings      (1,090)
        Exchange Differences                                        89
                                                                ------
        Movement in net funds in the period                     (1,493)
        Net funds at 31 December 1996                            2,269
                                                                ------
        Net funds at 1 October 1997                                776
                                                                ======

        c) Analysis of Net Funds

                               At 31 Dec.       Cash   Exch.   At 1 Oct.
                                    1996        Flow   Move.        1997
                                (In thousands of British pounds sterling)

        Cash in Hand, at Bank      2,798        (492)     89      2,395
        Overdrafts                  (529)     (1,090)      0     (1,619)
                                 ---------------------------------------
          Total                    2,269      (1,582)     89        776
                                 =======================================

25.     Reconciliation of Movement in Shareholders' Funds

                                   (In thousands of British pounds sterling)

       Equity shareholders' funds:
       Loss for the financial period                               (279)
       Other recognized gains and losses                            137
                                                                  -----
       Net addition to shareholders' funds                         (142)
       Opening shareholders' funds                                9,475
                                                                  -----
       Closing shareholders' funds                                9,333
                                                           =====
       Non-equity shareholders' funds:
       At 31 December 1996 and
       At 1 October 1997                                          1,520
                                                           =====

               Non-equity  shareholders'  funds  represent  redeemable  ordinary
          shares in Goring Kerr Detection Limited and Graseby Product Monitoring
          Limited.

26.     COMPANIES ACT 1985

               The combined  financial  statements do not constitute  "statutory
          accounts" within the meaning of the United Kingdom  Companies Act 1985
          for any of the periods presented.  These combined financial statements
          exclude  certain  parent  company  statements  and  other  information
          required by the Companies Act 1985. However, they include all material
          disclosures  required by generally accepted  accounting  principles in
          the United  Kingdom  including  those  Companies Act 1985  disclosures
          relating to the profit and loss account and balance sheet items. NOTES
          TO THE COMBINED ACCOUNTS (continued)

                                       16
<PAGE>

27.     SUMMARY OF DIFFERENCES BETWEEN UNITED KINGDOM AND UNITED STATES
        GENERALLY ACCEPTED ACCOUNTING PRINCIPLES

        (1)Differences giving rise to accounting adjustments

               The Company's  accounts are prepared in accordance with generally
          accepted  accounting  principles  ("GAAP")  applicable  in the  United
          Kingdom,  which  differ in  certain  significant  respects  from those
          applicable  in  the  United  States.   The  main  differences   relate
          principally to the following items, and the effects of the adjustments
          on  operating  profits,  net income and  shareholders'  funds,  and on
          certain balance sheet items are set out below.

        a.Goodwill

               Under U.K.  GAAP,  the Company  writes off  acquisition  goodwill
          directly against reserves in its combined balance sheet in the year of
          acquisition.  Under U.S.  GAAP,  goodwill is recognized in the balance
          sheet and  amortized by charges  against  income over its useful life,
          not to exceed forty years. The Company  considered  various factors in
          determining its amortization  period,  including  competitive,  legal,
          regulatory,  and other factors. As required by APB No. 17, the Company
          limited its amortization period to the specified maximum life of forty
          years.

               For U.S. GAAP  purposes,  goodwill has been  accounted for at the
          lower of amortized cost or fair value.  Fair value has been determined
          by reference to a non-discounted cash flow analysis over the remaining
          amortization   period.   Any  goodwill   amount  not  expected  to  be
          recoverable  as a result of this review would be  accounted  for as an
          impairment of value. No such impairment of value has occurred.

        b.Taxes on income

               Under U.K.  GAAP,  deferred tax is provided  using the  liability
          method at the rates ruling at each year end.  Timing  differences  are
          recognized to the extent that the directors  consider such differences
          will reverse in the foreseeable  future.  Net debit balances resulting
          from tax losses or other timing  differences are not recognized except
          to the extent that it is assured beyond  reasonable  doubt that future
          taxable profits will be sufficient to offset the losses or reversal of
          timing  differences  during the prescribed  carry forward period.  Any
          amounts not so recognized are subsequently only recognized as they are
          realized.  This policy was  substantially in accordance with U.S. GAAP
          prior to the  introduction  of SFAS No.  109,  "Accounting  for Income
          Taxes." Under SFAS No. 109, deferred tax liabilities related to timing
          differences  are fully  provided  and  future  taxation  benefits  are
          recognized as deferred tax assets to the extent that their realization
          is more likely than not.

                                       17
<PAGE>

                   NOTES TO THE COMBINED ACCOUNTS (continued)

        c.Hedging of anticipated intercompany foreign currency commitment

               Under  U.K.  GAAP,  hedges of  anticipated  intercompany  foreign
          currency  commitments  are  deferred  to the extent  that the  forward
          contracts are in a gain position. As a result of EITF 95-2, under U.S.
          GAAP,  either a third party commitment or a real economic loss imposed
          by  a  third  party  must  exist  for  intercompany  foreign  currency
          commitments to be firm. Such intercompany foreign currency commitments
          must be  considered  firm to  justify  deferral  of gains or losses on
          foreign  exchange  contracts  as required by FAS 52. As a result,  the
          Company's  foreign exchange forward  contracts to buy U.S. dollars and
          sell U.K.  pounds  sterling  have been marked to market for U.S.  GAAP
          purposes  with  the  resulting   gains  and  losses  included  in  the
          determination  of net income.  Such  contracts have not been marked to
          market for U.K. GAAP purposes.

        d.Combined Balance Sheet presentation

               The Combined  Balance Sheet prepared in accordance with U.K. GAAP
          differs in certain  respects from U.S. GAAP.  For example,  under U.K.
          GAAP current assets are presented  after fixed assets;  current assets
          include  amounts  which fall due after more than one year (see Note 9)
          and  creditors  falling due after one year are  deducted  from current
          assets to present net current assets (liabilities).

        e.Combined Statement of Cash Flows

               The  Company's  combined  statement  of cash flows is prepared in
          accordance  with Financial  Reporting  Standard No. 1 (Revised  1996),
          "Cash  Flow   Statements,"   and  presents   substantially   the  same
          information as that required under  Statement of Financial  Accounting
          Standards  No.  95.   However,   there  are  certain   differences  in
          classification  of items  within the  statement of cash flows and with
          regard to the  definition  of cash  equivalents  between U.K. and U.S.
          GAAP.

               Cash  flows  from  (i)  operating  activities;  (ii)  returns  on
          investments  and servicing of finance;  (iii)  taxation;  (iv) capital
          expenditure  and  financial  investment;   (v)  management  of  liquid
          resources;  and (vi)  financing  activities  are presented  separately
          under U.K. GAAP. However, U.S. GAAP only requires presentation of cash
          flows from three activities: operating, investing and financing.

               Cash and cash  equivalents  under U.K.  GAAP may include  cash in
          hand  and  deposits  repayable  on  demand  less any  bank  loans  and
          overdrafts  repayable  on  demand.  Under  U.S.  GAAP  overdrafts  are
          included in financing activities.

               Cash flows from taxation and returns on investments and servicing
          of finance are, with the exception of dividends paid and interest paid
          but capitalized, included as operating activities under U.S. GAAP. The
          payment of  dividends  is  included  under  financing  activities  and
          capitalized  interest is included under investing  activities for U.S.
          GAAP purposes.

                                       18
<PAGE>

                   NOTES TO THE COMBINED ACCOUNTS (continued)

               The following  table  summarizes  the statement of cash flows for
          the Group as if they had been presented in accordance with U.S. GAAP

                                                  9 months ended
                                                  1 October 1997
                        (In thousands of British pounds sterling)

Net cash outflow from operating activities                  (564)
Net cash used in investing activities                       (474)
Net cash provided by financing activities                    546
Exchange rate effect on cash                                  89
                                                            ----
Net decrease in cash and cash equivalents                   (403)
                                                            ====

        f.Effect on net income and shareholders' funds of differences between
          U.K. GAAP and U.S. GAAP.

     The following is a summary of the approximate  effects on operating profit,
     net income,  shareholders'  equity and on certain other balance sheet items
     if U.S. GAAP were to be applied instead of U.K. GAAP.

                                                       9 months ended
                                                       1 October 1997
                             (In thousands of British pounds sterling)

Operating Profit:
Operating profit under U.K. GAAP                                   11
Amortization of goodwill (1)                                     (323)
Foreign exchange forward contracts(2)                            (125)
                                                                 ----
Operating loss under U.S. GAAP                                   (437)
                                                                 ====

Net Income:
Loss on ordinary activities ("net loss") under
  U.K. GAAP                                                      (279)
Adjustments:
Amortization of goodwill(1)                                      (323)
Foreign exchange forward contracts(2)                             (75)
Deferred taxation(3)                                              117
                                                                 ----
Net loss under U.S. GAAP                                         (560)
                                                                 ====


                                       19
<PAGE>

NOTES TO THE COMBINED ACCOUNTS (continued)

The following is a summary of the approximate effect on shareholders' funds of
differences between U.K. GAAP and U.S. GAAP.
                                                       1 October 1997
                             (In thousands of British pounds sterling)

Shareholders' Funds:
Capital and reserves under U.K. GAAP                           10,853
Adjustments:
Goodwill(1)                                                    15,025
Foreign exchange forward contracts(2)                               1

Deferred taxation(3)                                              526
                                                               ------
Approximate shareholders' equity under U.S. GAAP               26,405
                                                               ======
Total Assets:
Under U.K. GAAP                                                16,730
Adjustments:
Goodwill(1)                                                    15,025
Foreign exchange forward contracts(2)                               1
Deferred taxation(3)                                              526
                                                               ------
Under U.S. GAAP                                                32,282
                                                               ======
Total Liabilities:
Under U.K. and U.S. GAAP                                        5,877
                                                               ======
Notes

(1)The goodwill adjustment relates to the acquisition of Product Monitoring
GmbH, Best Limited, Hascal Limited, InterTest Limited and Goring Kerr Limited
during the period 1991 to 1994. The goodwill of 17.2 million British pounds
sterling is being amortized under U.S. GAAP on a straight-line basis over 40
years and is 17.2 million British pounds sterling as of 1 October 1997, net of
accumulated amortization of 2.2 million British pounds sterling.

(2)The foreign exchange forward contracts adjustment recognizes the impact of
marking to market the foreign exchange forward contracts as required under U.S.
GAAP for the Company's contracts to buy U.S. dollars and sell U.K. pounds
sterling.

(3)The deferred taxation adjustment recognizes the deferred tax asset
under U.S. GAAP which is not recognized under U.K. GAAP.

(ii)Additional U.S. GAAP Disclosures

a.Disclosures about fair values of financial instruments

SFAS No. 107 requires the disclosure of estimated fair values for all financial
instruments for which it is practicable to estimate that value.

                                       20
<PAGE>


NOTES TO THE COMBINED ACCOUNTS (continued)

With regard to cash, short term debt, non-trade receivables and payables, and
lease obligations the terms of these financial instruments approximate those
available in the current market. Accordingly carrying values approximate fair
value.

It has not been practical to estimate the fair value of the 3.5 million British
pounds sterling group loan recoverable from the immediate parent company as
there is no market interest rate readily available to utilize in such an
estimate.

b.Concentration of credit risk

The Company does not have any significant concentrations of credit risk.


                                       21
<PAGE>


               UNAUDITED INTERIM PROFIT AND LOSS ACCOUNTS

                                                   Unaudited
                                            Six Months Ended March 31
                                                   1997          1998
                             (In thousands of British pounds sterling)
                                           (Predecessor)   (Successor)

TURNOVER                                       13,890        13,741
Cost of Sales                                   7,887         8,360
                                               ------        ------
Gross Profit                                    6,003         5,381
Other Operating Income                             34             -

Operating Expenses                              5,003         4,802
                                               ------        ------

OPERATING PROFIT                                1,034           579

Net interest                                       58            65
                                               ------        ------

PROFIT ON ORDINARY ACTIVITIES BEFORE
  TAXATION                                      1,092           644
Tax on Profit on Ordinary Activities             (542)         (337)
                                               ------        ------
Profit on Ordinary Activities After
  Taxation                                        550           307
Dividend Paid                                     761             -
                                               ------        ------

RETAINED (LOSS)/PROFIT                           (211)          307
                                               ======        ======

See accompanying notes.


                                       22
<PAGE>

                        UNAUDITED INTERIM BALANCE SHEET

                                                             Unaudited
                                                         31 March 1998
                              (In thousands of British pounds sterling)

        FIXED ASSETS
        Tangible assets                                            927
        Investments                                                  3

        CURRENT ASSETS
        Stocks                                                   4,208
        Debtors - amounts falling due within one year            6,103
                - amounts falling due after more than one year   4,525
        Cash at bank and in hand                                 3,546
                                                               -------
                                                                18,382
        Creditors - amounts falling due within one year         (7,812)
                                                               -------
        NET CURRENT ASSETS                                      10,570
                                                               -------
        TOTAL ASSETS LESS CURRENT LIABILITIES                   11,500
                                                               =======
        CAPITAL & RESERVES
        Combined share capital                                   1,471
        Share premium account                                    3,575
        Profit and loss account                                  4,934
                                                               -------
        EQUITY SHAREHOLDERS FUNDS                                9,980
        Non-equity shareholders funds                            1,520
                                                               -------

        TOTAL SHAREHOLDERS FUNDS                                11,500
                                                               =======

        See accompanying notes.


                                       23
<PAGE>

                   UNAUDITED INTERIM STATEMENTS OF CASH FLOWS


                                                         Unaudited
                                                  Six Months Ended March 31
                                                  1997                 1998
                                                (In British pounds sterling)
                                                (Predecessor)    (Successor)
     
Cash Flow from Operating Activities:
Operating Profit                                        1,034     579
Depreciation Charges                                      288     315
Decrease in Stocks                                        412     603
Increase in Debtors                                      (708) (1,168)
(Decrease)/Increase in Creditors                         (376)  1,952
                                                       ------  ------
  Net Cash Inflow from Operating Activities               650   2,281

Returns on Investments and Servicing of
  Finance:
Interest Received                                          58      65
                                                       ------  ------
  Net Cash Inflow for Returns on Investments               58      65

Capital Expenditure and Financial Investment:
Purchase of Tangible Fixed Assets                        (260)   (140)
                                                       ------  ------
  Net Cash Outflow for Capital Expenditure and
    Financial Investment                                 (260)   (140)

Dividends Paid                                           (761)      -
Financing:
Decrease in Short-term Borrowings                        (926)      -
Increase/(Decrease) in Long-term Receivable             1,267  (1,010)
                                                       ------  ------
  Net Cash Outflow from Financing                         341  (1,010)

Effect of Exchange Rate                                   (38)    (45)
                                                       ------  ------
Increase/(Decrease) in Cash in the Period                 (10)  1,151


Reconciliation of Net Cash Flow to Movement
  in Net Funds:
Increase/(Decrease) in Cash in the Period                 (10)  1,151

  Net Funds at Beginning of Period                       2,573   4,014
                                                        ------  ------
  Net Funds at End of Period                             2,563   5,165
                                                        ======  ======

See accompanying notes.


                                       24
<PAGE>

NOTES TO THE UNAUDITED INTERIM FINANCIAL STATEMENTS

1.      Interim Results

The interim financial statements presented have been prepared by the Product
Monitoring Group of Graseby plc without audit and, in the opinion of management,
reflect all adjustments of a normal recurring nature necessary for a fair
statement of the financial position at March 31, 1998 and the results of
operations and cash flows for the six months ended March 31, 1997 and 1998.
Interim results are not necessarily indicative of results for a full year.

2.Reconciling Items Between U.S. and U.K. Generally Accepted Accounting
  Principles

a)Interim Profit and Loss Accounts
                                                         Unaudited
                                                   Six Months Ended 31 March
                                                             1997       1998
                                    (In thousands of British pounds sterling)

        Profit on ordinary activities after
          taxation under U.K. GAAP                         550          307
        Amortization of goodwill                          (216)        (295)
        Foreign exchange forward contracts                 (75)           -
        Deferred taxation                                   25           25
                                                          ----         ----
        Net income under U.S. GAAP                         284           37
                                                          ====         ====
        See Note 27 of the audited accounts for explanation of reconciling
        items.

b)Interim Balance Sheet

                                                             Unaudited
                                                         31 March 1998
                              (In thousands of British pounds sterling)

        Shareholders Funds:
        Capital and reserves under U.K. GAAP                    11,500

        Adjustments:
          Goodwill                                              23,319
          Deferred taxation                                        551
                                                                ------
        Shareholders' equity under U.S. GAAP                    35,370
                                                                ======
        Total Assets:
        Under U.K. GAAP                                         19,312

        Adjustment:
          Goodwill                                              23,319
          Deferred taxation                                        551
                                                                ------
        Under U.S. GAAP                                         43,182
                                                                ======

        See Note 27 of the audited accounts for explanation of reconciling 
items.

                                       25
<PAGE>

NOTES TO THE UNAUDITED INTERIM FINANCIAL STATEMENTS (continued)


c)Interim Cash Flows

                                             Six Months Ended 31 March
                                                           1997   1998
                              (In thousands of British pounds sterling)

        Net cash provided by operating
          activities                                       670   2,301
        Net cash used in investing activities             (260)   (140)
        Net cash used in financing activities             (420) (1,010)
        Exchange rate effect on cash                        38      45
                                                        ------  ------
        Net increase in cash and cash
          equivalents                                       28   1,196
                                                        ======  ======



                                       26



Item 7.  Financial Statements, Pro Forma Combined Condensed Financial
         Information and Exhibits

    (b)  Pro Forma Combined Condensed Financial Information:

             The following unaudited pro forma combined condensed financial
         statements set forth the results of operations for the fiscal year
         ended January 3, 1998, and the six months ended July 4, 1998, as if the
         acquisition of the three businesses that constitute the Graseby
         product-monitoring group of Graseby Limited (Graseby Product
         Monitoring) by the Company had occurred at the beginning of 1997.
         Graseby Product Monitoring was acquired by Smiths Industries plc on
         October 1, 1997. Accordingly, the pro forma combined condensed
         statement of operations for the year ended January 3, 1998, includes
         the results of Graseby Product Monitoring for the nine months ended
         October 1, 1997 (the Predecessor) prior to its acquisition by Smiths
         plc and the three months ended January 3, 1998, subsequent to its
         acquisition by Smiths plc (the Successor). The primary difference in
         the basis of accounting between the Predecessor and the Successor
         relates to goodwill which has been adjusted in the pro forma combined
         condensed results of operations to reflect the goodwill arising as a
         result of the Company's acquisition of Graseby Product Monitoring.

             The acquisition has been accounted for using the purchase method of
         accounting. The pro forma results of operations are not necessarily
         indicative of future operations or the actual results that would have
         occurred had the acquisition of Graseby Product Monitoring been
         consummated at the beginning of 1997. The historical financial
         statements of Graseby Product Monitoring, originally prepared in
         accordance with U.K. generally accepted accounting principles and
         stated in British pounds sterling, have been translated into U.S.
         dollars and presented in a manner consistent with the financial
         statements of the Company, as described in Note 1 to these pro forma
         combined condensed statement of operations. In addition, the
         accompanying pro forma adjustments include those necessary to conform
         such financial statements to U.S. generally accepted accounting
         principles. The financial statements filed under part (a) of this item
         should be read in conjunction with these pro forma combined condensed
         financial statements.


                                       4
<PAGE>
<TABLE>
<CAPTION>

                                                                                              FORM 8-K/A
                                          THERMO SENTRON INC.
                          PRO FORMA COMBINED CONDENSED STATEMENT OF OPERATIONS
                                       Year Ended January 3, 1998
                                              (Unaudited)
                                                  
                                                  Historical                                    Pro Forma
                        -----------------------------------------------------------------  ------------------
                                              Graseby Product Monitoring
                                              -------------------------------------------
<CAPTION>
                                                                U.S. GAAP
                          Thermo  Predecessor  Successor     Total    Adjust-               Adjust-
                         Sentron    U.K. GAAP  U.K. GAAP U.K. GAAP      ments   U.S. GAAP     ments  Combined
                        --------     --------   --------  --------   --------    --------  --------  --------
                                                (In thousands except per share amounts)
<S>                     <C>          <C>        <C>       <C>        <C>         <C>       <C>       <C>

Revenues                $ 78,695     $ 33,642   $ 12,177  $ 45,819   $      -    $ 45,819  $      -  $124,514
                        --------     --------   --------  --------   --------    --------  --------  --------
Costs and Operating
  Expenses:
    Cost of revenues      47,564       20,042      8,020    28,062          -      28,062       325    75,951
    Selling, general,
      and administrative
      expenses            20,533       11,574      3,941    15,515        782      16,297       297    37,127
    Research and
      development
      expenses             1,888        1,887        513     2,400          -       2,400         -     4,288
                        --------     --------   --------  --------   --------    --------  --------  --------

                          69,985       33,503     12,474    45,977        782      46,759       622   117,366
                        --------     --------   --------  --------   --------    --------  --------  --------

Operating Income (Loss)    8,710          139       (297)     (158)      (782)       (940      (622)            7,148
Interest and Other Income
  (Expense), Net           1,926           (8)       (54)      (62)      (191)       (253)   (2,586)     (913)
                        --------     --------   --------  --------   --------    --------  --------  --------

Income (Loss) Before
  Income Taxes            10,636          131       (351)     (220)      (973)     (1,193)   (3,208)    6,235
Income Tax Provision
  (Benefit)                4,148          581        (14)      567       (192)        375    (1,210)    3,313
                        --------     --------   --------  --------   --------    --------  --------  --------

Net Income (Loss)       $  6,488     $   (450)  $   (337) $   (787)  $   (781)   $ (1,568) $ (1,998) $  2,922
                        ========     ========   ========  ========   ========    ========  ========  ========

Basic and Diluted
  Earnings per Share    $    .66                                                                     $    .30
                        ========                                                                     ========

Weighted Average Shares:
  Basic                    9,875                                                                        9,875
                        ========                                                                     ========
  Diluted                  9,878                                                                        9,878
                        ========                                                                     ========

See notes to pro forma combined condensed financial information.
</TABLE>

                                       5
<PAGE>
<TABLE>

                                                                                              FORM 8-K/A
                                          THERMO SENTRON INC.
                          PRO FORMA COMBINED CONDENSED STATEMENT OF OPERATIONS
                                     Six Months Ended July 4, 1998
                                              (Unaudited)
                                                    Historical                          Pro Forma
                                    -------------------------------------------    -------------------
                                                   Graseby Product Monitoring
                                                   ----------------------------
<CAPTION>
                                                           U.S. GAAP
                                      Thermo        U.K.     Adjust-                Adjust-
                                     Sentron        GAAP       ments  U.S. GAAP       ments   Combined
                                    --------    --------    --------   --------    --------   -------- 
                                                (In thousands except per share amounts)

<S>                                 <C>         <C>         <C>        <C>         <C>        <C>     
Revenues                            $ 40,558    $ 19,178    $      -   $ 19,178    $      -   $ 59,736
                                    --------    --------    --------   --------    --------   -------- 
Costs and Operating Expenses:
  Cost of revenues                    24,598      10,605           -     10,605        (156)    35,047
  Selling, general, and
    administrative expenses           10,666       6,374         442      6,816          69     17,551
  Research and development
    expenses                           1,006         805           -        805           -      1,811
                                    --------    --------    --------   --------    --------   -------- 

                                      36,270      17,784         442     18,226         (87)    54,409
                                    --------    --------    --------   --------    --------   -------- 

Operating Income (Loss)                4,288       1,394        (442)       952          87      5,327
Interest and Other Income
  (Expense), Net                         805         442           -        442      (1,099)       148
                                    --------    --------    --------   --------    --------   -------- 

Income (Loss) Before Income
  Taxes                                5,093       1,836        (442)     1,394      (1,012)     5,475
Income Tax Provision (Benefit)         1,968         654         (41)       613        (405)     2,176
                                    --------    --------    --------   --------    --------   -------- 

Net Income (Loss)                   $  3,125    $  1,182    $   (401)  $    781    $   (607)  $  3,299
                                    ========    ========    ========   ========    ========   ========

Basic and Diluted Earnings
  per Share                         $    .32                                                  $    .34
                                    ========                                                  ========

Weighted Average Shares:
  Basic                                9,776                                                     9,776
                                    ========                                                  ========
  Diluted                              9,779                                                     9,779
                                    ========                                                  ========
</TABLE>

See notes to pro forma combined condensed financial information.

                                       6
<PAGE>

                                                                  FORM 8-K/A

                            THERMO SENTRON INC.
        NOTES TO PRO FORMA COMBINED CONDENSED FINANCIAL INFORMATION
                                (Unaudited)

Note 1 - Basis of Presentation

    The results of operations of Graseby Product Monitoring have been presented
in the pro forma combined condensed statement of operations in accordance with
U.K. generally accepted accounting principles (GAAP) adjusted to conform to U.S.
GAAP. The historical financial statements of Graseby Product Monitoring are
denominated in British pound sterling, and have been translated at the average
exchange rate of 1.620 U.S. dollars per British pound sterling for the pro forma
combined condensed statement of operations for the nine months ended October 1,
1997 (Predecessor), 1.660 U.S. dollars per British pounds sterling for the three
months ended January 3, 1998 (Successor), and 1.654 U.S. dollars per British
pound sterling for the six months ended July 4, 1998. The allocation of the
purchase price is based on an estimate of the fair market value of the net
assets acquired and is subject to adjustment. To date, no information has been
gathered that would cause the Company to believe that the final allocation of
the purchase price will be materially different than the preliminary estimate.

Note 2 - Pro Forma Adjustments to Pro Forma Combined Condensed
          Statement of Operations (In thousands, except in text)

                                                 Year Ended     Six Months
                                                 January 3,        Ended
                                                    1998       July 4, 1998
                                                 ----------    ------------
                                                      Debit (Credit)

Adjustments to Convert U.K. GAAP to U.S. GAAP
- ---------------------------------------------

Selling, General, and Administrative Expenses
Record amortization of cost in excess of net
  assets of acquired companies over 40 years,
  recorded to shareholders' investment under
  U.K. GAAP                                        $   782       $   442
                                                   -------       -------

Interest and Other Income (Expense), Net
Record mark-to-market adjustment for
  foreign currency contract that is not
  recorded as a hedge under U.S. GAAP                  191             -
                                                   -------       -------

Income Tax Provision
Record deferred tax provision not recorded
  under U.K. GAAP                                     (192)          (41)
                                                   -------       -------

Pro Forma Adjustments
- ---------------------
Cost of Revenues
Increase in the work-in-process and finished 
  goods inventories of Graseby Product 
  Monitoring to the estimated selling price, 
  less the sum of the costs of disposal and 
  a reasonable profit allowance for the
  Company's selling efforts                            325          (156)
                                                   -------       -------


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Note 2 - Pro Forma Adjustments to Pro Forma Combined Condensed
          Statement of Operations (In thousands, except in text)
          (continued)

                                                 Year Ended     Six Months
                                                 January 3,        Ended
                                                    1998       July 4, 1998
                                                 ----------    ------------
                                                      Debit (Credit)

Selling, General, and Administrative Expenses
Eliminate corporate services fee charged to
  Graseby Product Monitoring by Smiths plc          $  (343)     $   (84)

Service fee of 1.0% and 0.8% of the revenues 
  of Graseby Product Monitoring for the fiscal 
  year ended January 3, 1998, and the six-month 
  period ended July 4, 1998, respectively, for 
  services provided under a services agreement
  between the Company and Thermo Electron               458          153

Amortization over 40 years of $38,574,000 of 
  cost in excess of net assets of acquired 
  companies created by the acquisition of 
  Graseby Product Monitoring, net of 
  amortization of cost in excess of net assets
  of acquired companies recorded in Graseby 
  Product Monitoring's historical results of 
  operations, as adjusted to conform to U.S. 
  GAAP                                                  182            -
                                                    -------      -------

                                                        297           69
                                                    -------      -------
Interest and Other Income (Expense), Net
Decrease in interest income as a result of
  the use of cash of $23.2 million to partially
  finance the acquisition of Graseby Product 
  Monitoring, calculated using the 90-day 
  Commercial Paper Composite Rate plus 25 
  basis points, or 5.85% for the year ended 
  January 3, 1998, and 5.71% for the six
  months ended July 4, 1998                          1,357           577

Increase in interest expense as a result of a 
  borrowing from Thermo Electron of $21.0 
  million to partially finance the acquisition 
  of Graseby Product Monitoring, calculated 
  using the 90-day Commercial Paper Composite 
  Rate plus 25 basis points, or 5.85% for the 
  year ended January 3, 1998, and 5.71% for 
  the six months ended July 4, 1998                   1,229          522
                                                    -------      -------

                                                      2,586        1,099
                                                    -------      -------

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Note 2 - Pro Forma Adjustments to Pro Forma Combined Condensed
          Statement of Operations (In thousands, except in text)
          (continued)

                                                 Year Ended     Six Months
                                                 January 3,        Ended
                                                    1998       July 4, 1998
                                                 ----------    ------------
                                                       Debit (Credit)

Income Tax Provision (Benefit)
Income tax benefit associated with the
  adjustments above (excluding the
  amortization of cost in excess of net
  assets of acquired companies), calculated
  at the Company's statutory rate of 40%           $ (1,210)     $  (405)
                                                    -------      -------


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Item 7.  Financial Statements, Pro Forma Combined Condensed Financial
         Information and Exhibits

    (c)  Exhibits

         2.1*  Agreement dated March 13, 1998, for the sale and purchase of all
               of the issued share capitals of Graseby Allen Limited, Graseby
               Product Monitoring Limited, Goring Kerr Detection Limited,
               Graseby Goring Kerr Inc., Graseby Andersen Inc. and part of the
               share capital of Allen France S.A., between Graseby Limited,
               Thermo Environmental Instruments Inc., Thermo Sentron Inc.,
               Smiths Industries plc, and Thermo Electron Corporation
               (previously filed as Exhibit 2.1 to the Registrant's Current
               Report on Form 8-K filed June 24, 1998). Pursuant to Item
               601(b)(2) of regulation S-K, schedules and exhibits to this
               Agreement have been omitted. The Company hereby undertakes to
               furnish supplementally a copy of such schedules and exhibits to
               the Commission upon request.

         2.2   Amendment Agreement dated May 7, 1998, between Graseby Limited,
               Thermo Environmental Instruments Inc., Thermo Sentron Inc.,
               Smiths Industries plc, and Thermo Electron Corporation
               (previously filed as Exhibit 2.2 to the Registrant's Current
               Report on Form 8-K filed June 24, 1998).

         2.3   Agreement, dated June 9, 1998, to further amend the sale and
               purchase agreement dated March 13, 1998 between Graseby Limited,
               Thermo Environmental Instruments Inc., Thermo Sentron Inc.,
               Smiths Industries plc, and Thermo Electron Corporation
               (previously filed as Exhibit 2.3 to the Registrant's Current
               Report on Form 8-K filed June 24, 1998). Pursuant to Item
               601(b)(2) of regulation S-K, schedules and exhibits to this
               Amendment Agreement have been omitted. The Company hereby
               undertakes to furnish supplementally a copy of such schedules and
               exhibits to the Commission upon request.

         10    $21.0 Million Promissory Note due December 15, 1998, payable to
               Thermo Electron Corporation (previously filed as Exhibit 10 to
               the Registrant's Current Report on Form 8-K filed June 24, 1998).


*  Confidential treatment requested as to certain portions of the document,
   which portions have been omitted and filed separately with the Securities and
   Exchange Commission.



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                                 SIGNATURES


    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, on this 26th day of August, 1998.

                               THERMO SENTRON INC.



                                   By: Paul F. Kelleher
                                       ---------------------------------
                                       Paul F. Kelleher
                                       Chief Accounting Officer



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