THERMOSPECTRA CORP
10-K, 1998-03-20
INSTRUMENTS FOR MEAS & TESTING OF ELECTRICITY & ELEC SIGNALS
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                       SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549
                   __________________________________________
                                    FORM 10-K
    (mark one)
    [ X ] Annual Report Pursuant to Section 13 or 15(d) of the Securities
          Exchange Act of 1934 for the fiscal year ended January 3, 1998.

    [   ] Transition Report Pursuant to Section 13 or 15(d) of the Securities
          Exchange Act of 1934.
                         Commission file number 1-13876

                            THERMOSPECTRA CORPORATION
             (Exact name of Registrant as specified in its charter)

    Delaware                                                       04-3242970
    (State or other jurisdiction of                          (I.R.S. Employer
    incorporation or organization)                        Identification No.)
    245 Winter Street
    Waltham, Massachusetts                                         02254-9046
    (Address of principal executive offices)                       (Zip Code)
       Registrant's telephone number, including area code: (781) 622-1000

           Securities registered pursuant to Section 12(b) of the Act:

                                                  Name of each exchange
             Title of each class                   on which registered
         ----------------------------            -----------------------
         Common Stock, $.01 par value            American Stock Exchange

           Securities registered pursuant to Section 12(g) of the Act:
                                      None
    Indicate by check mark whether the Registrant (1) has filed all reports
    required to be filed by Section 13 or 15(d) of the Securities Exchange
    Act of 1934 during the preceding 12 months, and (2) has been subject to
    the filing requirements for at least the past 90 days. Yes [ X ] No [   ]

    Indicate by check mark if disclosure of delinquent filers pursuant to
    Item 405 of Regulation S-K is not contained herein, and will not be
    contained, to the best of the Registrant's knowledge, in definitive proxy
    or information statements incorporated by reference into Part III of this
    Form 10-K or any amendment to this Form 10-K. [   ]

    The aggregate market value of the voting stock held by nonaffiliates of
    the Registrant as of January 30, 1998, was approximately $24,593,000.
    As of January 30, 1998, the Registrant had 12,560,000 shares of Common
    Stock outstanding.

                       DOCUMENTS INCORPORATED BY REFERENCE

    Portions of the Registrant's Annual Report to Shareholders for the year
    ended January 3, 1998, are incorporated by reference into Parts I and II.

    Portions of the Registrant's definitive Proxy Statement for the Annual
    Meeting of Shareholders to be held on June 1, 1998, are incorporated by
    reference into Part III.
PAGE
<PAGE>
                                     PART I

    Item 1. Business
            --------

    (a) General Development of Business
        -------------------------------

        ThermoSpectra Corporation (the Company or the Registrant) develops,
    manufactures, and markets imaging and inspection, temperature-control,
    and test and measurement instruments. These instruments are generally
    combined with proprietary operations and analysis software to provide
    industrial and research customers with integrated systems that address
    their specific needs. The Company was incorporated in Delaware in August
    1994 as an indirect, wholly owned subsidiary of Thermo Instrument Systems
    Inc., a publicly traded subsidiary of Thermo Electron Corporation.

        The Company has achieved and maintains its competitive position
    primarily by providing customers with a broad array of technologically
    advanced instrumentation. The Company's strategy for growth includes the
    continued development of new applications for its technology to address
    related market segments, identifying and acquiring complementary
    businesses, and strengthening its presence in selected geographic
    markets.

        In March 1997, Thermo Instrument acquired approximately 95% of the
    outstanding shares of Life Sciences International PLC (LSI), a London
    Stock Exchange-listed company. Subsequently, Thermo Instrument acquired
    the remaining shares of LSI capital stock. In July 1997, the Company
    agreed to acquire NESLAB Instruments, Inc. and its related sales and
    service entity, NESLAB Instruments Europa BV in the Netherlands,
    (collectively, NESLAB), a global supplier of temperature-control products
    and former LSI subsidiary, from Thermo Instrument for $76.2 million. The
    purchase price represents the sum of the net tangible book value of the
    business as of June 28, 1997, plus a percentage of Thermo Instrument's
    total cost in excess of net assets acquired associated with its
    acquisition of LSI, based on the aggregate 1996 revenues of NESLAB
    relative to LSI's 1996 consolidated revenues. The purchase price
    consisted of 2,759,042 shares of Company common stock valued at $31.3
    million issuable to Thermo Instrument and the assumption of $44.9 million
    of debt, which was paid to Thermo Instrument. Issuance of the common
    stock component of the purchase price will occur immediately after its
    listing upon the American Stock Exchange, which will require approval by
    the Company's shareholders. Because Thermo Instrument is the Company's
    majority shareholder and intends to vote its shares in favor of such
    listing, the approval is assured.

        In March 1997, the Company acquired Park Scientific Instruments
    Corporation (PSI), for $16.7 million in cash, including the repayment of
    $1.3 million in debt. In addition, the Company assumed outstanding PSI
    stock options that are exercisable into 144,941 shares of Company common
    stock at a weighted average exercise price of $3.07 per share, with an
    aggregate value of approximately $1.7 million as of the date of the
    merger agreement. PSI is a manufacturer of scanning-probe microscopes
    used in industry and academia to test and measure the topography and
    other surface properties of materials.
                                        2PAGE
<PAGE>
        In July 1997, the Company acquired Sierra Research and Technology
    Inc. (SRT), a manufacturer of systems used for the rework and repair of
    printed circuit boards, for $7.6 million in cash. 

        As of January 3, 1998, Thermo Instrument owned 11,756,517 shares of
    the common stock of the Company, representing 77% of such stock
    outstanding. Thermo Instrument develops, manufactures, markets, and
    services instruments and software used for the identification and
    quantification of complex molecular compounds and elements in gases,
    liquids, and solids. Uses include pharmaceutical drug research and
    clinical diagnostics, monitoring and measuring environmental pollutants,
    industrial inspection, and test and control for quality assurance and
    productivity improvement. In addition, Thermo Instrument develops,
    manufactures, markets, and services equipment for the measurement,
    preparation, storage, and automation of sample materials, and photonics
    and vacuum components for original equipment manufacturers. As of January
    3, 1998, Thermo Electron owned 954,253 shares of the common stock of the
    Company, representing 6% of such stock outstanding. During 1997*, Thermo
    Electron purchased 845,000 shares in the open market for a total purchase
    price of $10.8 million. Thermo Electron provides analytical and
    monitoring instruments; biomedical products including heart-assist
    devices, respiratory-care equipment, and mammography systems; paper
    recycling and papermaking equipment; alternative-energy systems;
    industrial-process equipment; and other specialized products. Thermo
    Electron also provides industrial outsourcing, particularly in
    environmental-liability management, laboratory analysis, and
    metallurgical services, and conducts advanced-technology research and
    development.

    Forward-looking Statements

        Forward-looking statements, within the meaning of Section 21E of the
    Securities Exchange Act of 1934, are made throughout this Annual Report
    on Form 10-K. For this purpose, any statements contained herein that are
    not statements of historical fact may be deemed to be forward-looking
    statements. Without limiting the foregoing, the words "believes,"
    "anticipates," "plans," "expects," "seeks," "estimates," and similar
    expressions are intended to identify forward-looking statements. There
    are a number of important factors that could cause the results of the 
    Company to differ materially from those indicated by such forward-looking
    statements, including those detailed under the heading "Forward-looking
    Statements" in the Registrant's 1997 Annual Report to Shareholders, which
    statements are incorporated herein by reference.

    (b) Financial Information About Industry Segments
        ---------------------------------------------

        The Company is engaged in one business segment: developing,
    manufacturing, and marketing imaging and inspection, temperature-control,
    and test and measurement instruments.


    * References to 1997, 1996, and 1995 herein are for the fiscal years
      ended January 3, 1998, December 28, 1996, and December 30, 1995,
      respectively.
                                        3PAGE
<PAGE>
    (c) Description of Business
        -----------------------

        (i) Principal Products and Services
            -------------------------------

        The Company manufactures and markets a variety of advanced
    instrumentation that employs a broad range of technologies.

    Imaging and Inspection Systems

        The Company's Kevex Instruments and NORAN Instruments subsidiaries
    manufacture X-ray analytical instruments enhanced by real-time digital
    imaging technology for the electronics, aerospace, and automotive
    industries, among others. The product lines include several X-ray
    microanalysis instruments that analyze the chemical composition of
    microscopic samples by detecting, collecting, sorting, and measuring
    X-rays emitted by a sample that has been excited by an energy source. The
    Company also manufactures a range of X-ray fluorescence instruments that
    incorporate an X-ray source into the instrument to excite the sample.

        Industrial customers, universities, and government laboratories
    represent the majority of the end users of X-ray microanalysis systems.
    Over 50% of the Company's sales of X-ray microanalyzers are to electron
    microscope manufacturers, including Japan Electro Optical Laboratories,
    Hitachi, Ltd., and Amray, for resale to end users. The Company sells its
    X-ray microanalyzers and X-ray fluorescence instruments in the U.S.
    through a direct sales force; through a combination of direct
    salespeople, distributors, and sales representatives in Europe, Japan,
    and the rest of the Pacific Rim; and through original equipment
    manufacturer (OEM) relationships with electron microscope manufacturers.

        The Company's Kevex X-Ray subsidiary is a manufacturer of specialized
    X-ray sources used by industrial users for imaging, inspection,
    analytical, and thickness-gauging applications. Kevex X-Ray also supplies
    X-ray sources for advanced medical diagnostic imaging equipment. The
    Company sells its X-ray sources primarily to OEMs through a direct sales
    force in the United States, a distributor in Japan, and through both a
    direct sales force and distributors in the remainder of the world.

        The Company's Nicolet Imaging Systems (NIS) division manufactures
    real-time, nondestructive X-ray imaging systems for quality-control
    inspection. NIS' products are used to inspect high-reliability,
    high-liability products, two examples of which are components for the
    telecommunications industry and those used in airbag assembly in the
    automobile industry. The Company's line of X-ray inspection products are
    among the most complete on the market, ranging from manual, industrial
    inspection systems to fully automated, conveyorized circuit board
    analysis systems for high-volume electronics manufacturing. The Company
    markets its X-ray inspection systems worldwide through a network of
    domestic and international sales representatives.

        Through the Company's recently acquired SRT subsidiary, the Company
    manufactures systems for the rework and repair of printed circuit boards
    that have failed quality-control inspection. The product line includes
    systems that remove defective components from the board, clean away
                                        4PAGE
<PAGE>
    excess solder, redispense solder to the board, and replace components.
    This is facilitated by proprietary software that allows for increased
    automation and ease of use when incorporated into the system. The Company
    sells its circuit board-repair systems through a combination of
    distributors and sales representatives.

        Through its PSI subsidiary, the Company designs, manufactures, and
    sells a family of scanning probe microscopes, including vacuum, ambient
    air, and liquid cell systems. Scanning probe microscopy is a new imaging
    tool that offers three-dimensional resolution used for studying the
    surface properties of materials down to the atomic level. Scanning probe
    microscopes can measure such physical surface properties as magnetic
    fields, surface conductivity, and static-charge distribution. PSI's
    instruments are used for academic, semiconductor, computer storage,
    materials science, optics, and life science applications. The Company
    sells its scanning probe microscopes through a direct sales force,
    representatives, and distributors throughout the world.

        The Company's NORAN subsidiary manufactures confocal laser scanning
    microscopes that create an image of a sample by rapidly scanning it with
    a laser light source. Confocal microscopes provide greatly enhanced depth
    resolution over conventional optical microscopes. The Company sells its
    confocal laser scanning microscope through a direct sales force and
    through distributors and sales representatives.

        Revenues from imaging and inspection systems represented 46%, 55%,
    and 49% of the Company's total revenues in 1997, 1996, and 1995,
    respectively.

    Temperature-control Systems

        Through its NESLAB subsidiary, the Company manufactures and markets
    precision temperature-control systems for analytical, laboratory,
    industrial, R&D, laser, and semiconductor applications. The laboratory
    product line includes constant-temperature bath/circulators and immersion
    coolers typically used for cell culture, incubations, refractometer
    cooling, and general research and development. The industrial product
    line features self-contained cooling systems that pump chilled water
    through water-cooled equipment such as lasers; analytical instrumentation
    such as X-ray diffraction; and, in the semiconductor industry, etchers
    and ion implanters.

        The Company sells its temperature-control systems through a direct
    sales force in the U.S. and Europe, and through a network of distributors
    and sales representatives in the rest of the world. Revenues from
    temperature-control systems represented 28% of the Company's total
    revenues in 1997.

    Test and Measurement Instruments

        The Company's Nicolet Instrument Technologies and Gould Instrument
    Systems subsidiaries manufacture data-acquisition systems, digital
    oscilloscopes, and recording systems addressing a broad range of
    applications, primarily research-oriented. Markets served include
                                        5PAGE
<PAGE>
    automotive, power, medical research, telecommunications, and TV and
    video. The product family enables the analysis and display of most common
    signal types such as voltage, pressure, current, strain, acceleration,
    and temperature.

        The Company markets its test and measurement instruments in the
    United States and Europe through a combination of direct salespeople,
    distributors, and sales representatives, and in the rest of the world
    through over 90 distributors and sales representatives. Revenues from
    test and measurement instruments represented 26%, 45%, and 51% of the
    Company's total revenues in 1997, 1996, and 1995, respectively.

        (ii) and (xi) New Products; Research and Development

        The Company maintains active programs for the development of both
    hardware and software to create new applications for its instruments that
    address related market segments and to enhance existing applications.
    Research and development expenses for the Company were $17.3 million,
    $12.9 million, and $9.0 million in 1997, 1996, and 1995, respectively.

        (iii) Raw Materials

        Raw materials, components, and supplies purchased by the Company are
    either available from a number of different suppliers or from alternative
    sources that could be developed without a material adverse effect on the
    Company's business. To date, the Company has experienced no difficulties
    in obtaining these materials.

        (iv) Patents, Licenses, and Trademarks

        The Company's policy is to protect its intellectual property rights
    and to apply for patent protection when appropriate. The Company is the
    owner of a number of patents. Patent protection provides the Company with
    competitive advantages with respect to certain instruments. The Company
    believes, however, that technical know-how and trade secrets are more
    important to its business than patent protection.

        (v) Seasonal Influences

        There are no significant seasonal influences on the Company's sales
    of its products.

        (vi) Working Capital Requirements

        There are no special inventory requirements or credit terms extended
    to customers that would have a material adverse effect on the Company's
    working capital.

        (vii) Dependency on a Single Customer

        No single customer accounted for more than 10% of the Company's total
    revenues in any of the past three years.
                                        6PAGE
<PAGE>
        (viii) Backlog
               -------

        The Company's backlog of firm orders was $40.4 million as of
    January 3, 1998, and $24.5 million as of December 28, 1996. The Company
    believes that substantially all of the backlog as of January 3, 1998,
    will be shipped during 1998. Certain of such firm orders are cancellable
    by the customer upon payment of a cancellation charge. The Company does
    not believe that the size of its backlog is necessarily indicative of
    intermediate or long-term trends in its business.

        (ix) Government Contracts
             --------------------

        Not applicable.

        (x) Competition
            -----------

        The Company competes primarily on the basis of technical advances
    that result in new products and improved price/performance ratios and
    reputation among customers as a quality leader for products and services.
    To a lesser extent, the Company competes on the basis of price. The
    Company is not aware of any other company that competes with it in all of
    its product lines. Some of the Company's competitors have resources
    substantially greater than those of the Company.

    Imaging and Inspection Systems

        The Company competes in both the high- and mid-end of the X-ray
    microanalysis market. In the high end of this market, the Company offers
    superior imaging and user-interface software. By incorporating computer
    workstations in some of its systems, the Company believes it offers its
    customers superior ability to collect, analyze, and display images, and
    to network into a broader laboratory environment. The Company also offers
    mid-level products in this market, with instruments that operate on a
    personal-computer platform. The Company competes in the mid-end of this
    market on the basis of quality, performance, and price. The primary
    competitors in this segment are Link Analytical Limited, a wholly owned
    subsidiary of Oxford Instruments plc and EDAX.

        The Company's X-ray fluorescence product offerings compete in the
    high end of this market. The Company believes that its strong X-ray
    source and detector technology gives its products unique capabilities for
    industrial process analysis. The Company competes on the basis of
    quality, performance, technology, and price. The primary competitors in
    this segment are Horiba Ltd., Seiko Instruments Inc., and Jordan Valley
    Applied Radiation, Ltd.

        The Company competes in the specialty X-ray source market on the
    basis of quality and price. Competitors in such markets include Hamamatsu
    Photonics KK, True Focus Inc., and Oxford.

        In the X-ray inspection market, the Company competes on the basis of
    superior imaging performance, imaging analysis algorithms, customer-
    applications expertise, overall machine flexibility and quality, and
    price. In the manual segment of the X-ray inspection market, the Company
                                        7PAGE
<PAGE>
    competes primarily with a few small companies. In the automated segment,
    its main competitor is Four Pi, a subsidiary of Hewlett-Packard. No
    company occupies an across-the-board dominant position. Competitors also
    include manufacturers of visible and laser-based inspection systems.

        SRT competes primarily on the basis of technological innovation,
    performance, and price. SRT's main competitors are Fine Tech, AirVac,
    Conceptronics, OK Industries, APE, Manncorp, Pace, Mannix, and SEC.

        The Company competes primarily in the high-speed imaging segment of
    the confocal microscopy market. The Company competes by offering a
    higher-speed imaging capability than its competitors. The Company also
    competes by offering a highly integrated software package to its
    customers. The Company competes only to a lesser extent on the basis of
    price. The Company believes it holds the largest share of the high-speed
    imaging market, however, it is a minor competitor in the overall confocal
    life sciences market. Major competitors include Bio-Rad Laboratories,
    Inc., Carl Zeiss, Inc., Leica PLC, and Nikon, Inc.

        The Company competes in the scanning probe microscope market on the
    basis of quality, performance, and price. The dominant competitor in this
    market is Digital Instruments Inc. Other competitors include Seiko and
    Topometrix Corporation.

    Temperature-control Systems

        NESLAB competes primarily on the basis of performance, price, and
    customer service. The Company's main competitors are Lauder and Julabo.

    Test and Measurement Instruments

        In the broad-based test and measurement market, the Company competes
    with products offering a wide range of measurement capabilities and price
    points. The Company competes on the basis of quality of the measurement
    and analysis capability of its products. The Company's combined product
    lines are among the most complete in the industry, mostly differentiating
    themselves on the quality of measurement and analysis capabilities. To a
    much lesser degree, the Company competes on price. The Company believes
    it is well-positioned to capitalize on the market transition from
    monolithic, single-purpose tools based on proprietary architectures to
    multi-purpose Windows(R)-based acquisition and analysis systems.

        A common competitor for the Company across all test and measurement
    product lines is Yokogawa Corporation. The Company also competes with
    Hewlett Packard and Tektronix in the general-purpose digital storage
    oscilloscope marketplace. In the oscillographic recorder marketplace, the
    primary competition comes from Astro-Med and Graphtec Corporation of
    Japan. In the data acquisition marketplace, the Company competes in a
    variety of applications and markets against a range of competitors.
    Primary competition at the low end of the marketplace comes from
    companies such as National Instruments and IOTech and in the
    high-performance segments competition comes from companies such as
    Hewlett-Packard, as well as many smaller regional suppliers.
                                        8PAGE
<PAGE>
        (xii) Environmental Protection Regulations

        The Company believes that its compliance with federal, state, and
    local environmental protection regulations will not have a material
    adverse effect on its capital expenditures, earnings, or competitive
    position.

        (xiii) Number of Employees

        As of January 3, 1998, the Company employed approximately 1,400
    people.

    (d) Financial Information About Exports by Domestic Operations and About
        Foreign Operations

        Financial information about exports by domestic operations and about
    foreign operations is summarized in Note 12 to Consolidated Financial
    Statements in the Registrant's 1997 Annual Report to Shareholders and is
    incorporated herein by reference.

    (e) Executive Officers of the Registrant

                                      Present Title (Year First Became
        Name                    Age   Executive Officer)
        -------------------------------------------------------------------
        Barry S. Howe            41   President and Chief Executive Officer
                                        (1998)
        John N. Hatsopoulos      63   Chief Financial Officer and
                                        Senior Vice President (1994)
        Richard S. Melanson      44   Senior Vice President (1997)
        Christopher J. Barron    49   Vice President (1994)
        Ronald W. Lindell        46   Vice President (1994)
        Paul F. Kelleher         55   Chief Accounting Officer (1994)

        Each executive officer serves until his successor is chosen or
    appointed by the Board of Directors and qualified or until earlier
    resignation, death, or removal. Messrs. Hatsopoulos and Kelleher have
    held comparable positions for at least five years with Thermo Instrument
    and Thermo Electron. Mr. Howe has been President and Chief Executive
    Officer of the Company since March 1998. Prior to joining the Company,
    Mr. Howe was President and Chief Executive Officer of Thermo BioAnalysis
    Corporation, from February 1995 to March 1998, and President of Thermo
    Instrument's Thermo Separation Products Inc. subsidiary and its
    predecessor, a manufacturer of liquid chromatography instruments, from
    September 1989 to December 1995. Mr. Barron has been a Vice President of
    the Company since August 1994 and President of Nicolet Instrument
    Technologies, Inc. since August 1993. Mr. Barron held various positions
    within Nicolet Instrument Corporation (Nicolet) from May 1988 to August
    1993. Nicolet is a wholly owned subsidiary of Thermo Optek Corporation, a
    publicly traded, majority-owned subsidiary of Thermo Instrument. Mr.
    Lindell has been a Vice President of the Company since August 1994 and
    President of Nicolet Imaging Systems since January 1994. Mr. Lindell was
    a founder of Imaging Systems International, Inc. and its President from
    November 1992 to January 1994. Mr. Melanson has been a Senior Vice
                                        9PAGE
<PAGE>
    President of the Company and President of NESLAB Instruments Inc. since
    October 1997. Mr. Melanson was Vice President and General Manager of
    Philips ElectroScan from July 1996 to September 1997 and was President
    and Chief Executive Officer of ElectroScan Corporation from September
    1989 to July 1996. Each of the above-named officers is a full-time
    employee of the Company except for Messrs. Hatsopoulos and Kelleher, who
    are full-time employees of Thermo Electron but devote such time to the
    affairs of the Company as the Company's needs reasonably require.

    Item 2. Properties
            ----------

        The Company owns approximately 200,000 square feet of office,
    engineering, laboratory, and manufacturing space in Valencia, California;
    Middleton, Wisconsin; and Hainault, England. The Company leases
    approximately 440,000 square feet of additional office, engineering,
    laboratory, and manufacturing space under leases expiring from 1998
    through 2005, principally in Newington, New Hampshire; Valley View, Ohio;
    San Diego, California; and Sunnyvale, California. The Company believes
    that its facilities are in good condition and are suitable and adequate
    for its present operations. With respect to leases expiring in the near
    future, in the event the Company does not renew such leases, the Company
    believes suitable alternate space is available for lease on acceptable
    terms.

    Item 3. Legal Proceedings
            -----------------

        Not applicable.

    Item 4. Submission of Matters to a Vote of Security Holders
            ---------------------------------------------------

        Not applicable.

                                       10PAGE
<PAGE>
                                     PART II

    Item 5. Market for Registrant's Common Equity and Related Stockholder
            -------------------------------------------------------------
            Matters
            -------

        Information concerning the market and market price for the
    Registrant's Common Stock, $.01 par value, and dividend policy is
    included under the sections labeled "Common Stock Market Information" and
    "Dividend Policy" in the Registrant's 1997 Annual Report to Shareholders
    and is incorporated herein by reference.

    Item 6. Selected Financial Data
            -----------------------

        The information required under this item is included under the
    sections labeled "Selected Financial Information" and "Dividend Policy"
    in the Registrant's 1997 Annual Report to Shareholders and is
    incorporated herein by reference.

    Item 7. Management's Discussion and Analysis of Financial Condition and
            ---------------------------------------------------------------
            Results of Operations
            ---------------------

        The information required under this item is included under the
    heading "Management's Discussion and Analysis of Financial Condition and
    Results of Operations" in the Registrant's 1997 Annual Report to
    Shareholders and is incorporated herein by reference.

    Item 8. Financial Statements and Supplementary Data
            -------------------------------------------

        The Registrant's Consolidated Financial Statements as of January 3,
    1998, and Supplementary Data are included in the Registrant's 1997 Annual
    Report to Shareholders and are incorporated herein by reference.

    Item 9. Changes in and Disagreements with Accountants on Accounting and
            ---------------------------------------------------------------
            Financial Disclosure
            --------------------

        Not applicable.

                                       11PAGE
<PAGE>
                                    PART III

    Item 10. Directors and Executive Officers of the Registrant
             --------------------------------------------------

        The information concerning directors required under this item is
    incorporated herein by reference from the material contained under the
    caption "Election of Directors" in the Registrant's definitive proxy
    statement to be filed with the Securities and Exchange Commission
    pursuant to Regulation 14A, not later than 120 days after the close of
    the fiscal year. The information concerning delinquent filers pursuant to
    Item 405 of Regulation S-K is incorporated herein by reference from the
    material contained under the heading "Section 16(a) Beneficial Ownership
    Reporting Compliance" under the caption "Stock Ownership" in the
    Registrant's definitive proxy statement to be filed with the Securities
    and Exchange Commission pursuant to Regulation 14A, not later than 120
    days after the close of the fiscal year.

    Item 11. Executive Compensation
             ----------------------

        The information required under this item is incorporated herein by
    reference from the material contained under the caption "Executive
    Compensation" in the Registrant's definitive proxy statement to be filed
    with the Securities and Exchange Commission pursuant to Regulation 14A,
    not later than 120 days after the close of the fiscal year. 

    Item 12. Security Ownership of Certain Beneficial Owners and Management
             --------------------------------------------------------------

        The information required under this item is incorporated herein by
    reference from the material contained under the caption "Stock Ownership"
    in the Registrant's definitive proxy statement to be filed with the
    Securities and Exchange Commission pursuant to Regulation 14A, not later
    than 120 days after the close of the fiscal year.

    Item 13. Certain Relationships and Related Transactions
             ----------------------------------------------

        The information required under this item is incorporated herein by
    reference from the material contained under the caption "Relationship
    with Affiliates" in the Registrant's definitive proxy statement to be
    filed with the Securities and Exchange Commission pursuant to Regulation
    14A, not later than 120 days after the close of the fiscal year.


                                       12PAGE
<PAGE>
                                     PART IV

    Item 14. Exhibits, Financial Statement Schedules, and Reports on Form 8-K
             ----------------------------------------------------------------
      
       (a,d) Financial Statements and Schedules
             ----------------------------------


             (1) The consolidated financial statements set forth in the list
                 below are filed as part of this Report.

             (2) The consolidated financial statement schedules set forth in
                 the list below are filed as part of this Report.

             (3) Exhibits filed herewith or incorporated herein by reference
                 are set forth in Item 14(c) below.

             List of Financial Statements and Schedules Referenced in this
             -------------------------------------------------------------
             Item 14
             -------

             Information incorporated by reference from Exhibit 13 filed
             herewith:

                 Consolidated Statement of Income
                 Consolidated Balance Sheet
                 Consolidated Statement of Cash Flows
                 Consolidated Statement of Shareholders' Investment
                 Notes to Consolidated Financial Statements
                 Report of Independent Public Accountants

             Financial Statement Schedules filed herewith:

                 Schedule II: Valuation and Qualifying Accounts

             All other schedules are omitted because they are not applicable
             or not required, or because the required information is shown
             either in the financial statements or in the notes thereto.

         (b) Reports on Form 8-K
             -------------------

             On August 11, 1997, the Company filed a Current Report on Form
             8-K pertaining to its acquisition of NESLAB Instruments Inc., a
             wholly owned subsidiary of the Company's parent, Thermo
             Instruments Inc. On October 14, 1997, the Company filed an
             amendment on Form 8-K/A, the purpose of which was to file the
             financial information required by Form 8-K concerning this
             acquisition.

         (c) Exhibits
             --------

             See Exhibit Index on the page immediately preceding exhibits.
                                       13PAGE
<PAGE>
                                   SIGNATURES

        Pursuant to the requirements of Section 13 or 15(d) 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.

    Date: March 18, 1998            THERMOSPECTRA CORPORATION


                                    By: Barry S. Howe
                                    ---------------------------------------
                                    Barry S. Howe
                                      President and Chief Executive Officer

        Pursuant to the requirements of the Securities Exchange Act of 1934,
    this report has been signed below by the following persons on behalf of
    the Registrant and in the capacities indicated, as of March 18, 1998.


    Signature                      Title
    ---------                      -----


    By: Barry S. Howe          President, Chief Executive Officer,
        --------------------      and Director
        Barry S. Howe       

    By: John N. Hatsopoulos    Chief Financial Officer and Senior
        ---------------------      Vice President
        John N. Hatsopoulos   

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

    By: Robert E. Finnigan     Director
        ---------------------
        Robert E. Finnigan

    By: Elias P. Gyftopoulos   Director
        ---------------------
        Elias P. Gyftopoulos

    By: Earl R. Lewis          Director
        ---------------------
        Earl R. Lewis

    By: Theo Melas-Kyriazi     Chairman of the Board and Director
        ---------------------
        Theo Melas-Kyriazi

    By: Arvin H. Smith         Director
        ---------------------
        Arvin H. Smith

                                       14PAGE
<PAGE>
                    Report of Independent Public Accountants
                    ----------------------------------------

    To the Shareholders and Board of Directors of ThermoSpectra Corporation:

        We have audited, in accordance with generally accepted auditing
    standards, the consolidated financial statements included in
    ThermoSpectra Corporation's Annual Report to Shareholders incorporated by
    reference in this Form 10-K, and have issued our report thereon dated
    February 17, 1998. Our audits were made for the purpose of forming an
    opinion on those statements taken as a whole. The schedule listed in Item
    14 on page 13 is the responsibility of the Company's management and is
    presented for purposes of complying with the Securities and Exchange
    Commission's rules and is not part of the basic consolidated financial
    statements. This schedule has been subjected to the auditing procedures
    applied in the audits of the basic consolidated financial statements and,
    in our opinion, fairly states in all material respects the consolidated
    financial data required to be set forth therein in relation to the basic
    consolidated financial statements taken as a whole.



                                               Arthur Andersen LLP



    Boston, Massachusetts
    February 17, 1998








                                       15PAGE
<PAGE>
   SCHEDULE II

                            THERMOSPECTRA CORPORATION
                        Valuation And Qualifying Accounts
                                 (In thousands)


                    Balance  Provision
                         at    Charged             Accounts            Balance
                  Beginning         to   Accounts   Written             at End
  Description       of Year    Expense  Recovered       Off  Other(a)  of Year
  ----------------------------------------------------------------------------
  Allowance for
   Doubtful Accounts

  Year Ended
   Jan. 3, 1998      $1,516      $  521    $  135    $ (704) $  466     $1,934

  Year Ended
   Dec. 28, 1996     $1,095      $  199    $    1    $ (436) $  657     $1,516

  Year Ended
   Dec. 30, 1995     $1,007      $  192    $    -    $ (559) $  455     $1,095

  (a) Includes allowance of businesses acquired during the year as described
      in Note 3 to Consolidated Financial Statements in the Registrant's 1997
      Annual Report to Shareholders and the effect of foreign currency
      translation.








                                       16PAGE
<PAGE>
                                  EXHIBIT INDEX

    Exhibit
    Number      Description of Exhibit
    ------------------------------------------------------------------------
      2.1       Asset Purchase Agreement dated as of August 5, 1996, between
                the Registrant and Thermo Instrument Systems Inc. for the
                purchase of the Kevex businesses (filed as Exhibit 2 to the
                Registrant's Quarterly Report on form 10-Q for the quarter
                ended June 29, 1996 [File No. 1-13876] and incorporated
                herein by reference).

      2.2       Agreement and Plan of Merger dated as of January 30, 1997,
                by and among the Registrant, Park Acquisition Corp., and
                Park Scientific Instruments Corporation (filed as Exhibit
                2.2 to the Registrant's Annual Report on Form 10-K for the
                fiscal year ended December 28, 1996 [File No. 1-13876] and
                incorporated herein by reference). Pursuant to Item
                601(b)(2) of Regulation S-K, schedules to this Agreement
                have been omitted. The Registrant hereby undertakes to
                furnish supplementally a copy of such schedules to the
                Commission upon request.

      2.3       Share purchase agreement dated as of July 30, 1997, between
                the Registrant and Thermo Instrument for the purchase of
                NESLAB Instruments Inc. (filed as Exhibit 2.1 to the
                Registrant's Quarterly Report on Form 10-Q for the quarter
                ended June 28, 1997 [File No. 1-13876] and incorporated
                herein by reference).

      3.1       Certificate of Incorporation of the Registrant (filed as
                Exhibit 3.1 to the Registrant's Registration Statement on
                Form S-1 [Reg. No. 33-93778] and incorporated herein by
                reference).

      3.2       By-Laws of the Registrant (filed as Exhibit 3.2 to the
                Registrant's [Reg. No. 33-93778] and incorporated herein by
                reference).

     10.1       Corporate Services Agreement dated as of August 10, 1994,
                between the Registrant and Thermo Electron Corporation
                (filed as Exhibit 10.1 to the Registrant's Registration
                Statement on Form S-1 [Reg. No. 33-93778] and incorporated
                herein by reference).

     10.2       Thermo Electron Corporate Charter, as amended and restated
                effective January 3, 1993 (filed as Exhibit 10.1 to Thermo
                Electron's Annual Report on Form 10-K for the fiscal year
                ended January 2, 1993 [File No. 1-8002] and incorporated
                herein by reference).

     10.3       Tax Allocation Agreement dated as of August 10, 1994,
                between the Registrant and Thermo Electron (filed as Exhibit
                10.3 to the Registrant's Registration Statement on Form S-1
                [Reg. No. 33-93778] and incorporated herein by reference).

                                       17PAGE
<PAGE>
                                  EXHIBIT INDEX

    Exhibit
    Number      Description of Exhibit
    ------------------------------------------------------------------------
     10.4       Amended and Restated Master Repurchase Agreement dated as of
                December 28, 1996, between the Registrant and Thermo
                Electron (filed as Exhibit 10.4 to the Registrant's Annual
                Report on Form 10-K for the fiscal year ended December 28,
                1996 [File No. 1-13876] and incorporated herein by
                reference).

     10.5       Amended and Restated Master Guarantee Reimbursement and Loan
                Agreement dated as of December 4, 1997, between the
                Registrant and Thermo Electron (filed as Exhibit 10.40 to
                Thermo Instrument's Annual Report on Form 10-K for the
                fiscal year ended January 3, 1998 [File No. 1-9786] and
                incorporated herein by reference).

     10.6       Amended and Restated Master Guarantee Reimbursement and Loan
                Agreement dated as of December 4, 1997, between the
                Registrant and Thermo Instrument.

     10.7       ThermoSpectra - Park Scientific Instruments Corporation 1988
                Incentive Stock Option Plan (filed as Exhibit 10.7 to the
                Registrant's Annual Report on Form 10-K for the fiscal year
                ended December 28, 1996 [File No. 1-13876] and incorporated
                herein by reference).

     10.8       Lease Agreement dated as of November 30, 1995, between
                Nicolet Instrument Corporation and Nicolet Instrument
                Technologies, Inc. (filed as Exhibit 10.8 to the
                Registrant's 1995 Annual Report on Form 10-K [File No.
                1-13876] and incorporated herein by reference).

     10.9       Lease Agreement dated as of July 26, 1989, between Gould
                Instrument Systems, Inc. (successor-in-interest to Gould,
                Inc.) and Linclay (filed as Exhibit 10.9 to the Registrant's
                Registration Statement on Form S-1 [Reg. No. 33-93778] and
                incorporated herein by reference).

     10.10      Lease Agreement dated as of October 19, 1994, between RREEF
                West-VI, Inc. and Thermo Instrument (filed as Exhibit 10.10
                to the Registrant's Registration Statement on Form S-1 [Reg.
                No. 33-93778] and incorporated herein by reference).

     10.11      Stock Purchase Agreement dated as of May 10, 1995, among the
                Registrant, Thermo Instrument, and Japan Energy Corporation
                (filed as Exhibit 10.11 to the Registrant's Registration
                Statement on Form S-1 [Reg. No. 33-93778] and incorporated
                herein by reference).

     10.12      $7.3 Million Note due September 2001 issued to Thermo
                Instrument (filed as Exhibit 10.17 to the Registrant's
                Registration Statement on Form S-1 [Reg. No. 33-93778] and
                incorporated herein by reference).

                                       18PAGE
<PAGE>
                                  EXHIBIT INDEX

    Exhibit
    Number      Description of Exhibit
    ------------------------------------------------------------------------
     10.13      Equity Incentive Plan of the Registrant (filed as Exhibit
                10.18 to the Registrant's Registration Statement on Form S-1
                [Reg. No. 33-93778] and incorporated herein by reference).

                In addition to the stock-based compensation plans of the
                Registrant, the executive officers of the Registrant may be
                granted awards under stock-based compensation plans of
                Thermo Electron and Thermo instrument for services rendered
                to the Registrant or such affiliated corporations. The terms
                of such plans are substantially the same as those of the
                Registrant's Equity Incentive Plan.

     10.14      Deferred Compensation Plan for Directors of the Registrant
                (filed as Exhibit 10.19 to the Registrant's Registration
                Statement on Form S-1 [Reg. No. 33-93778] and incorporated
                herein by reference).

     10.15      Directors' Stock Option Plan of the Registrant (filed as
                Exhibit 10.20 to the Registrant's Registration Statement on
                Form S-1 [Reg. No. 33-93778] and incorporated herein by
                reference). 

     10.16      Form of Indemnification Agreement for Officers and Directors
                (filed as Exhibit 10.21 to the Registrant's Registration
                Statement on Form S-1 [Reg. No. 33-93778] and incorporated
                herein by reference).

     10.17      Restated Stock Holdings Assistance Plan and Form of
                Promissory Note (filed as Exhibit 10.17 to the Registrant's
                Annual Report on Form 10-K for the year ended December 28,
                1996 [File No. 1-13876] and incorporated herein by
                reference).

     10.18      $15,000,000 Promissory Note dated as of August 5, 1996,
                issued by the Registrant to Thermo Electron (filed as
                Exhibit 10.1 to the Registrant's Quarterly Report on Form
                10-Q for the quarter ended June 29, 1996 [File No. 1-13876]
                and incorporated herein by reference).

     10.19      $10,000,000 Promissory Note dated as of March 12, 1997,
                issued by the Registrant to Thermo Electron (filed as
                Exhibit 10.19 to the Registrant's Annual Report on Form 10-K
                for the year ended December 28, 1996 [File No. 1-13876] and
                incorporated herein by reference).

     10.20      $5,000,000 Promissory Note dated as of August 1, 1997,
                issued by the Registrant to Thermo Electron (filed as
                Exhibit 10 to the Registrant's Quarterly Report on Form 10-Q
                for the quarter ended June 28, 1997 [File No. 1-13876] and
                incorporated herein by reference).

                                       19PAGE
<PAGE>
                                  EXHIBIT INDEX

    Exhibit
    Number      Description of Exhibit
    ------------------------------------------------------------------------
     10.21      $45,000,000 Promissory Note dated as of September 12, 1997,
                issued by the Registrant to Thermo Electron (filed as
                Exhibit 10 to the Registrant's Quarterly Report on Form 10-Q
                for the quarter ended September 27, 1997 [File No. 1-13876]
                and incorporated herein by reference).

     13         Annual Report to Shareholders for the year ended January 3,
                1998 (only those portions incorporated herein by reference).

     21         Subsidiaries of the Registrant.

     23         Consent of Arthur Andersen LLP.

     27.1       Financial Data Schedule for the year ended January 3, 1998.

     27.2       Financial Data Schedule for the quarter ended March 30, 1996
                (restated for the adoption of SFAS No. 128).

     27.3       Financial Data Schedule for the quarter ended September 28,
                1996 (restated for the adoption of SFAS No. 128).




                                                        Exhibit 10.6
              AMENDED AND RESTATED MASTER GUARANTEE REIMBURSEMENT
                               AND LOAN AGREEMENT

             This AGREEMENT is entered into as of the 4th day of
        December, 1997, by and among Thermo Instrument Systems Inc. (the
        "Parent") and those of its subsidiaries that join in this
        Agreement by executing the signature page hereto (the "Majority
        Owned Subsidiaries").
                                   WITNESSETH:

             WHEREAS, the Majority Owned Subsidiaries and their
        wholly-owned subsidiaries wish to enter into various financial
        transactions, such as convertible or nonconvertible debt, loans,
        and equity offerings, and other contractual arrangements with
        third parties (the "Underlying Obligations") and may provide
        credit support to, on behalf of or for the benefit of, other
        subsidiaries of the Parent ("Credit Support Obligations"); 

             WHEREAS, the Majority Owned Subsidiaries and the Parent
        acknowledge that the Majority Owned Subsidiaries and their
        wholly-owned subsidiaries may be unable to enter into many kinds
        of Underlying Obligations without a guarantee of their
        performance thereunder from the Parent (a "Parent Guarantee") or
        without obtaining Credit Support Obligations from other Majority
        Owned Subsidiaries;

             WHEREAS, the Majority Owned Subsidiaries and their
        wholly-owned subsidiaries may borrow funds from the Parent, and
        the Parent may loan funds or provide credit to the Majority Owned
        Subsidiaries and their wholly-owned subsidiaries, on a short-term
        and unsecured basis; and

             WHEREAS, the Parent is willing to consider continuing to
        issue Parent Guarantees and providing credit, and the Majority
        Owned Subsidiaries are willing to consider continuing to provide
        Credit Support Obligations and to borrow funds, on the terms and
        conditions set forth below;

             NOW, THEREFORE, in consideration of the foregoing and other
        good and valuable consideration, the receipt and sufficiency of
        which are hereby acknowledged by each party hereto, the parties
        agree as follows:

        1.   If the Parent provides a Parent Guarantee of an Underlying
             Obligation, and the beneficiary(ies) of the Parent Guarantee
             enforce the Parent Guarantee, or the Parent performs under
             the Parent Guarantee for any other reason, then the Majority
             Owned Subsidiary that is obligated, either directly or
             indirectly through a wholly-owned subsidiary, under such
             Underlying Obligation shall indemnify and save harmless the
             Parent from any liability, cost, expense or damage
             (including reasonable attorneys' fees) suffered by the
PAGE
<PAGE>
             Parent as a result of the Parent Guarantee.  If a Majority
             Owned Subsidiary or a wholly-owned subsidiary thereof
             provides a Credit Support Obligation for any subsidiary of
             the Parent, other than a subsidiary of such Majority Owned
             Subsidiary, and the beneficiary(ies) of the Credit Support
             Obligation enforce the Credit Support Obligation, or the
             Majority Owned Subsidiary or its wholly-owned subsidiary  
             performs under the Credit Support Obligation for any other
             reason, then the Parent shall indemnify and save harmless
             the Majority Owned Subsidiary or its wholly-owned
             subsidiary, as applicable, from any liability, cost, expense
             or damage (including reasonable attorneys' fees) suffered by
             the Majority Owned Subsidiary or its wholly-owned
             subsidiary, as applicable, as a result of the Credit Support
             Obligation.  Without limiting the foregoing, Credit Support
             Obligations include the deposit of funds by a Majority Owned
             Subsidiary or a wholly-owned subsidiary thereof in a credit
             arrangement with a banking facility whereby such funds are
             available to the banking facility as collateral for
             overdraft obligations of other Majority Owned Subsidiaries
             or their subsidiaries also participating in the credit
             arrangement with such banking facility.

        2.   For purposes of this Agreement, the term "guarantee" shall
             include not only a formal guarantee of an obligation, but
             also any other arrangement where the Parent is liable for
             the obligations of a Majority Owned Subsidiary or its
             wholly-owned subsidiaries.  Such other arrangements include
             (a) representations, warranties and/or covenants or other
             obligations joined in by the Parent, whether on a joint or
             joint and several basis, for the benefit of the Majority
             Owned Subsidiary or its wholly-owned subsidiaries and (b)
             responsibility of the Parent by operation of law for the
             acts and omissions of the Majority Owned Subsidiary or its
             wholly-owned subsidiaries, including controlling person
             liability under securities and other laws.

        3.   Promptly after the Parent receives notice that a beneficiary
             of a Parent Guarantee is seeking to enforce such Parent
             Guarantee, the Parent shall notify the Majority Owned
             Subsidiary(s) obligated, either directly or indirectly
             through a wholly-owned subsidiary, under the relevant
             Underlying Obligation.  Such Majority Owned Subsidiary(s) or
             wholly-owned subsidiary thereof, as applicable, shall have
             the right, at its own expense, to contest the claim of such
             beneficiary.  If a Majority Owned Subsidiary or wholly-owned
             subsidiary thereof, as applicable, is contesting the claim
             of such beneficiary, the Parent will not perform under the
             relevant Parent Guarantee unless and until, in the Parent's
             reasonable judgment, the Parent is obligated under the terms
             of such Parent Guarantee to perform.  Subject to the
             foregoing, any dispute between a Majority Owned Subsidiary
             or wholly-owned subsidiary thereof, as applicable, and a
             beneficiary of a Parent Guarantee shall not affect such
PAGE
<PAGE>
             Majority Owned Subsidiary's obligation to promptly indemnify
             the Parent hereunder.  Promptly after a Majority Owned
             Subsidiary or wholly-owned subsidiary thereof, as
             applicable, receives notice that a beneficiary of a Credit
             Support Obligation is seeking to enforce such Credit Support
             Obligation, the Majority Owned Subsidiary shall notify the
             Parent.  The Parent shall have the right, at its own
             expense, to contest the claim of such beneficiary.  If the
             Parent or the subsidiary of the Parent on whose behalf the
             Credit Support Obligation is given is contesting the claim
             of such beneficiary, the Majority Owned Subsidiary or
             wholly-owned subsidiary thereof, as applicable, will not
             perform under the relevant Credit Support Obligation unless
             and until, in the Majority Owned Subsidiary's reasonable
             judgment, the Majority Owned Subsidiary or wholly-owned
             subsidiary thereof, as applicable, is obligated under the
             terms of such Credit Support Obligation to perform.  Subject
             to the foregoing, any dispute between the Parent or the
             subsidiary of the Parent on whose behalf the Credit Support
             Obligation was given, on the one hand, and a beneficiary of
             a Credit Support Obligation, on the other, shall not affect
             the Parent's obligation to promptly indemnify the Majority
             Owned Subsidiary or its wholly-owned subsidiary, as
             applicable, hereunder.  

        4.   Upon the request of a Majority Owned Subsidiary, the Parent
             may make loans and advances to the Majority Owned Subsidiary
             or its wholly-owned subsidiaries on a short-term, revolving
             credit basis, from time to time in such amounts as mutually
             determined by the Parent and the Majority Owned Subsidiary.
             The aggregate principal amount of such loans and advances
             shall be reflected on the books and records of the Majority
             Owned Subsidiary (or wholly-owned subsidiary, as applicable)
             and the Parent.  All such loans and advances shall be on an
             unsecured basis unless specifically provided otherwise in
             loan documents executed at that time.  The Majority Owned
             Subsidiary or its wholly-owned subsidiaries, as applicable,
             shall pay interest on the aggregate unpaid principal amount
             of such loans from time to time outstanding at a rate
             ("Interest Rate") equal to the rate of the Commercial Paper
             Composite Rate for 90-day maturities as reported by Merrill
             Lynch Capital Markets, as an average of the last five
             business days of such Majority Owned Subsidiary's latest
             fiscal quarter then ended, plus twenty-five (25) basis
             points.  The Interest Rate shall be adjusted on the first
             business day of each fiscal quarter of such Majority Owned
             Subsidiary pursuant to the Interest Rate formula contained
             in the preceding sentence and shall be in effect for the
             entirety of such fiscal quarter.  Interest shall be computed
             on a 360-day basis.  The aggregate principal amount
             outstanding and accrued interest thereon shall be payable on
             demand.  The principal and accrued interest may be paid by
             the Majority Owned Subsidiaries or their wholly-owned
             subsidiaries, as applicable, at any time or from time to
PAGE
<PAGE>
             time, in whole or in part, without premium or penalty.  All
             payments shall be applied first to accrued interest and then
             to principal.  Principal and interest shall be payable in
             lawful money of the United States of America, in immediately
             available funds, at the principal office of the Parent or at
             such other place as the Parent may designate from time to
             time in writing to the Majority Owned Subsidiary.  The
             unpaid principal amount of any such borrowings, and accrued
             interest thereon, shall become immediately due and payable,
             without demand, upon the failure of the Majority Owned
             Subsidiary or its wholly-owned subsidiary, as applicable, to
             pay its debts as they become due, the insolvency of the
             Majority Owned Subsidiary or its wholly-owned subsidiary, as
             applicable, the filing by or against the Majority Owned
             Subsidiary or its wholly-owned subsidiary, as applicable, of
             any petition under the U.S. Bankruptcy Code (or the filing
             of any similar petition under the insolvency law of any
             jurisdiction), or the making by the Majority Owned
             Subsidiary or its wholly-owned subsidiary, as applicable, of
             an assignment or trust mortgage for the benefit of creditors
             or the appointment of a receiver, custodian or similar agent
             with respect to, or the taking by any such person of
             possession of, any property of the Majority Owned Subsidiary
             or its wholly-owned subsidiary, as applicable.  In case any
             payments of principal and interest shall not be paid when
             due, the Majority Owned Subsidiary or its wholly-owned
             subsidiary, as applicable, further promises to pay all cost
             of collection, including reasonable attorneys' fees.   

        5.   All payments required to be made by a Majority Owned
             Subsidiary or its wholly-owned subsidiaries, as applicable,
             shall be made within two days after receipt of notice from
             the Parent. All payments required to be made by the Parent
             shall be made within two days after receipt of notice from
             the Majority Owned Subsidiary.  

        6.   This Agreement shall be governed by and construed in
             accordance with the laws of the Commonwealth of
             Massachusetts applicable to contracts made and performed
             therein.

             IN WITNESS WHEREOF, the parties have caused this Agreement
        to be executed by their duly authorized officers as of the date
        first above written.


                                      THERMO INSTRUMENT SYSTEMS INC.


                                      By:  /s/ Earl R. Lewis
                                           ------------------------------
                                      Title:    President
PAGE
<PAGE>
                                      THERMOSPECTRA CORPORATION 


                                      By:  /s/ Theo Melas-Kyriazi
                                           ------------------------------
                                      Title:    President




                                                                   Exhibit 13




















                            THERMOSPECTRA CORPORATION

                        Consolidated Financial Statements

                                      1997
PAGE
<PAGE>
    ThermoSpectra Corporation                       1997 Financial Statements

                        Consolidated Statement of Income

    (In thousands except per share amounts)       1997       1996       1995
    ------------------------------------------------------------------------
    Revenues (Notes 8 and 12)                 $198,900   $123,199   $ 91,714
                                              --------   --------   --------
    Costs and Operating Expenses:
      Cost of revenues (Note 8)                115,747     62,900     46,384
      Selling, general, and administrative
        expenses (Note 8)                       53,182     36,493     28,501
      Research and development
        expenses                                17,303     12,910      9,036
      Gain on sale of business (Note 3)         (2,210)         -          -
      Other nonrecurring expense, net
        (Note 4)                                   953        171          -
                                              --------   --------   --------
                                               184,975    112,474     83,921
                                              --------   --------   --------
    Operating Income                            13,925     10,725      7,793

    Interest Income                                692        935        820
    Interest Expense                               (66)         -          -
    Interest Expense, Related Party (Note 8)    (4,151)      (773)      (707)
                                              --------   --------   --------
    Income Before Provision for Income Taxes    10,400     10,887      7,906
    Provision for Income Taxes (Note 6)          4,552      4,270      3,312
                                              --------   --------   --------
    Net Income                                $  5,848   $  6,617   $  4,594
                                              ========   ========   ========
    Earnings per Share (Note 13):
      Basic                                   $    .40   $    .53   $    .41
                                              ========   ========   ========
      Diluted                                 $    .39   $    .53   $    .40
                                              ========   ========   ========

    Weighted Average Shares (Note 13):
      Basic                                     14,694     12,437     11,229
                                              ========   ========   ========
      Diluted                                   14,806     12,570     11,356
                                              ========   ========   ========


    The accompanying notes are an integral part of these consolidated
    financial statements.

                                        2PAGE
<PAGE>
    ThermoSpectra Corporation                       1997 Financial Statements

                           Consolidated Balance Sheet

    (In thousands)                                          1997        1996
    ------------------------------------------------------------------------
    Assets
    Current Assets:
      Cash and cash equivalents                         $ 20,672    $ 16,580
      Available-for-sale investments, at quoted
        market value (cost of $2,056; Note 2)              2,083           -
      Accounts receivable, less allowances of
        $1,934 and $1,516                                 43,015      32,327
      Inventories                                         34,785      27,042
      Prepaid income taxes (Note 6)                        7,337       5,931
      Other current assets                                 1,774       1,722
                                                        --------    --------
                                                         109,666      83,602
                                                        --------    --------
    Property, Plant, and Equipment, at Cost, Net          20,391      20,169
                                                        --------    --------
    Patents, Trademarks, and Other Assets                  8,108       7,938
                                                        --------    --------
    Cost in Excess of Net Assets of Acquired
      Companies (Notes 3, 4, and 6)                      115,232      40,776
                                                        --------    --------
                                                        $253,397    $152,485
                                                        ========    ========
















                                        3PAGE
<PAGE>
    ThermoSpectra Corporation                       1997 Financial Statements

                     Consolidated Balance Sheet (continued)

    (In thousands except share amounts)                      1997       1996
    ------------------------------------------------------------------------
    Liabilities and Shareholders' Investment
    Current Liabilities:
      Note payable to Thermo Electron (Notes 3 and 8)    $ 15,000   $      -
      Note payable (Note 9)                                     -        591
      Accounts payable                                     12,842     11,508
      Accrued payroll and employee benefits                 6,987      5,334
      Accrued installation and warranty expenses            4,495      3,396
      Deferred revenue                                      4,695      3,453
      Accrued income taxes                                  2,050      1,792
      Other accrued expenses (Note 4)                       8,496      9,586
      Due to affiliated companies                           1,561      3,259
                                                         --------   --------
                                                           56,126     38,919
                                                         --------   --------
    Deferred Income Taxes (Note 6)                            356        268
                                                         --------   --------
    Other Deferred Items                                    1,277      1,377
                                                         --------   --------
    Long-term Obligations, Due to Thermo Electron
      and Thermo Instrument (Notes 3 and 8)                67,300     22,300
                                                         --------   --------

    Commitments and Contingencies (Notes 7 and 8)

    Shareholders' Investment (Notes 3, 5, and 10):
      Common stock, $.01 par value, 25,000,000 shares
        authorized; 15,313,506 and 12,439,950 shares
        issued                                                153        124
      Capital in excess of par value                      111,262     77,416
      Retained earnings                                    17,938     12,345
      Treasury stock at cost, 423 and 305 shares               (7)        (5)
      Cumulative translation adjustment                    (1,035)      (259)
      Unrealized gain on available-for-sale
        investments (Note 2)                                   27          -
                                                         --------   --------
                                                          128,338     89,621
                                                         --------   --------
                                                         $253,397   $152,485
                                                         ========   ========


    The accompanying notes are an integral part of these consolidated
    financial statements.

                                        4PAGE
<PAGE>
    ThermoSpectra Corporation                       1997 Financial Statements

                      Consolidated Statement of Cash Flows

    (In thousands)                           1997         1996          1995
    ------------------------------------------------------------------------
    Operating Activities:
      Net income                         $  5,848     $  6,617      $  4,594
      Adjustments to reconcile net
        income to net cash provided by
        operating activities:
          Depreciation and amortization     6,615        4,493         3,720
          Gain on sale of business
            (Note 3)                       (2,210)           -             -
          Restructuring expense (Note 4)      953        1,038             -
          Provision for losses on
            accounts receivable               521          199           192
          Other noncash expenses            1,417          839           430
          Deferred income tax (benefit)
            expense                           (40)        (796)           75
          Changes in current accounts,
            excluding the effects of
            acquisitions:
              Accounts receivable            (733)      (3,444)          739
              Inventories                   4,873       (3,105)       (1,106)
              Other current assets            (81)         335          (173)
              Accounts payable             (2,330)       2,123        (3,116)
              Due to affiliates            (2,699)         426         1,398
              Other current liabilities    (3,782)      (3,276)       (1,432)
          Other                                34          (21)            -
                                         --------     --------      --------
    Net cash provided by operating
      activities                            8,386        5,428         5,321
                                         --------     --------      --------
    Investing Activities:
      Acquisitions, net of cash acquired
        (Note 3)                          (21,142)     (22,521)      (26,142)
      Proceeds from sale of business
        (Note 3)                            4,980            -             -
      Refund of acquisition purchase
        price (Note 4)                          -        1,103             -
      Purchases of property, plant, and
        equipment                          (2,595)      (2,762)       (1,254)
      Proceeds from sale of property,
        plant, and equipment                   91          168           452
      Purchases of available-for-sale
        investments                             -       (3,000)            -
      Proceeds from sale and maturities
        of available-for-sale
        investments                             -        3,000         4,855
      Investment in joint venture               -            -        (2,017)
      Other, net                             (926)        (733)           34
                                         --------     --------      --------
    Net cash used in investing
      activities                         $(19,592)    $(24,745)     $(24,072)
                                         --------     --------      --------

                                        5PAGE
<PAGE>

    ThermoSpectra Corporation                       1997 Financial Statements

                Consolidated Statement of Cash Flows (continued)

    (In thousands)                              1997        1996        1995
    ------------------------------------------------------------------------
    Financing Activities:
      Proceeds from issuance of long-term
        obligations to Thermo Electron
        (Note 8)                            $ 60,000    $ 15,000    $ 15,000
      Repayment of long-term obligation
        to Thermo Electron                         -           -     (15,000)
      Payment to Thermo Instrument for debt
        assumed in connection with 
        acquisition of NESLAB (Note 3)       (44,907)          -           -
      Net proceeds from issuance of
        Company common stock (Note 10)           561          74      24,880
      Other                                     (674)        552           -
                                            --------    --------    --------
    Net cash provided by financing
      activities                              14,980      15,626      24,880
                                            --------    --------    --------
    Exchange Rate Effect on Cash                 318         (35)       (262)
                                            --------    --------    --------
    Increase (Decrease) in Cash and Cash
      Equivalents                              4,092      (3,726)      5,867
    Cash and Cash Equivalents at Beginning
      of Year                                 16,580      20,306      14,439
                                            --------    --------    --------
    Cash and Cash Equivalents at
      End of Year                           $ 20,672    $ 16,580    $ 20,306
                                            ========    ========    ========

    Cash Paid For:
      Interest                              $  4,217    $    773    $    806
      Income taxes                          $  4,490    $  3,419    $  1,796

    Noncash Activities:
      Inventory contributed to joint
        venture                             $      -    $      -    $    412

      Common stock received from sale of
        business (Note 3)                   $  2,056    $      -    $      -
      Fair value of assets of acquired
        companies                           $114,495    $ 29,757    $ 47,597
      Cash paid for acquired companies       (24,379)    (22,525)    (28,098)
      Stock options issued in connection
        with acquisition of PSI               (1,693)          -           -
      Stock issuable to Thermo Instrument
        for acquisition of NESLAB            (31,315)          -           -
      Debt assumed in connection with
        acquisition of NESLAB                (44,907)          -           -
                                            --------    --------    --------
      Liabilities assumed of acquired 
        companies                           $ 12,201    $  7,232    $ 19,499
                                            ========    ========    ========

    The accompanying notes are an integral part of these consolidated
    financial statements.
                                        6PAGE
<PAGE>
    ThermoSpectra Corporation                       1997 Financial Statements

               Consolidated Statement of Shareholders' Investment

    (In thousands)                              1997        1996        1995
    ------------------------------------------------------------------------
    Common Stock, $.01 Par Value
      Balance at beginning of year          $    124    $    124    $    105
      Stock issuable to Thermo Instrument
        for acquisition of NESLAB (Note 3)        28           -           -
      Issuance of Company common
        stock (Note 10)                            1           -          19
                                            --------    --------    --------
      Balance at end of year                     153         124         124
                                            --------    --------    --------
                                                 
    Capital in Excess of Par Value
      Balance at beginning of year            77,416      76,955      52,005
      Stock issuable to Thermo Instrument
        for acquisition of NESLAB (Note 3)    31,287           -           -
      Stock options issued in connection
        with acquisition of PSI (Note 3)       1,693           -           -
      Issuance of Company common
        stock (Note 10)                          562          79      24,861
      Tax benefit related to employees'
        and directors' stock plans               304         382          89
                                            --------    --------    --------
      Balance at end of year                 111,262      77,416      76,955
                                            --------    --------    --------
    Retained Earnings
      Balance at beginning of year            12,345       5,728       1,134
      Net income                               5,848       6,617       4,594
      Deemed distribution to Thermo
        Instrument for acquisition of
        NESLAB (Note 3)                         (255)          -           -
                                            --------    --------    --------
      Balance at end of year                  17,938      12,345       5,728
                                            --------    --------    --------
    Treasury Stock
      Balance at beginning of year                (5)          -           -
      Purchases of Company common stock           (2)         (5)          -
                                            --------    --------    --------
      Balance at end of year                      (7)         (5)          -
                                            --------    --------    --------
    Cumulative Translation Adjustment
      Balance at beginning of year              (259)       (282)         69
      Translation adjustment                    (776)         23        (351)
                                            --------    --------    --------
      Balance at end of year                  (1,035)       (259)       (282)
                                            --------    --------    --------
    Unrealized Gain on Available-for-sale
      Investments
      Balance at beginning of year                 -           -           -
      Unrealized gain on available-for-sale
        investments (Note 2)                      27           -           -
                                            --------    --------    --------
      Balance at end of year                      27           -           -
                                            --------    --------    --------
    Total Shareholders' Investment          $128,338    $ 89,621    $ 82,525
                                            ========    ========    ========
    The accompanying notes are an integral part of these consolidated
    financial statements.
                                        7PAGE
<PAGE>
    ThermoSpectra Corporation                       1997 Financial Statements

                   Notes to Consolidated Financial Statements

    1.  Nature of Operations and Summary of Significant Accounting Policies

    Nature of Operations
        ThermoSpectra Corporation (the Company) develops, manufactures, and
    markets imaging and inspection, temperature-control, and test and
    measurement instruments, which represent 46%, 28%, and 26% of the
    Company's 1997 revenues, respectively. The Company sells its products on
    a worldwide basis (Note 12).

    Relationship with Thermo Instrument Systems Inc. and Thermo Electron
    Corporation
        The Company was incorporated in August 1994 as an indirect, wholly
    owned subsidiary of Thermo Instrument Systems Inc., which is an 82%-owned
    subsidiary of Thermo Electron Corporation. As of January 3, 1998, Thermo
    Instrument and Thermo Electron owned a total of 12,710,770 shares of the
    Company's common stock, representing 83% of such stock outstanding,
    including 2,759,042 shares issuable to Thermo Instrument upon shareholder
    approval (Note 3).

    Principles of Consolidation
        The accompanying financial statements include the accounts of the
    Company and its wholly owned subsidiaries. All material intercompany
    accounts and transactions have been eliminated.

    Fiscal Year
        The Company has adopted a fiscal year ending the Saturday nearest
    December 31. References to 1997, 1996, and 1995 are for the fiscal years
    ended January 3, 1998, December 28, 1996, and December 30, 1995,
    respectively. Fiscal year 1997 included 53 weeks; 1996 and 1995 each
    included 52 weeks.

    Revenue Recognition
        The Company recognizes product revenue upon shipment. The Company
    provides a reserve for its estimate of warranty and installation costs at
    the time of shipment. Deferred revenue in the accompanying balance sheet
    consists of unearned revenue on service contracts, which is recognized as
    revenue over the life of the service contract. Substantially all of the
    deferred revenue included in the accompanying 1997 balance sheet will be
    recognized within one year.

    Software Development Costs
        In accordance with Statement of Financial Accounting Standards (SFAS)
    No. 86, "Accounting for the Costs of Computer Software to be Sold,
    Leased, or Otherwise Marketed," software development costs are expensed
    as incurred until technological feasibility has been established. The
    Company believes that, under its current process for developing software,
    the software is essentially completed concurrently with the establishment
    of technological feasibility. Accordingly, no software development costs
    have been capitalized.
                                        8PAGE
<PAGE>
    ThermoSpectra Corporation                       1997 Financial Statements

                   Notes to Consolidated Financial Statements

    1.  Nature of Operations and Summary of Significant Accounting Policies
        (continued)

    Stock-based Compensation Plans
        The Company applies Accounting Principles Board Opinion (APB) No. 25,
    "Accounting for Stock Issued to Employees" and related interpretations in
    accounting for its stock-based compensation plans (Note 5). Accordingly,
    no accounting recognition is given to stock options granted at fair
    market value until they are exercised. Upon exercise, net proceeds,
    including tax benefits realized, are credited to equity.

    Income Taxes
        The Company and Thermo Instrument entered into a tax allocation
    agreement under which both the Company and Thermo Instrument were
    included in Thermo Electron's consolidated federal and certain state
    income tax returns. The agreement provided that, in years that the
    Company had taxable income, the Company would pay to Thermo Instrument
    amounts comparable to the taxes the Company would have paid if it had
    filed separate tax returns. Subsequent to the Company's initial public
    offering in August 1995, Thermo Instrument's equity ownership of the
    Company was reduced below 80% and, as a result, the Company is required
    to file its own federal income tax returns. Subsequent to the issuance of
    2,759,042 shares to Thermo Instrument (Note 3), the Company may be
    included in Thermo Electron's consolidated tax returns, provided that
    certain tax requirements are met.
        In accordance with SFAS No. 109, "Accounting for Income Taxes," the
    Company recognizes deferred income taxes based on the expected future tax
    consequences of differences between the financial statement basis and the
    tax basis of assets and liabilities, calculated using enacted tax rates
    in effect for the year in which the differences are expected to be
    reflected in the tax return.

    Earnings per Share
        During the fourth quarter of 1997, the Company adopted SFAS No. 128,
    "Earnings per Share" (Note 13). As a result, all previously reported
    earnings per share have been restated, and the Company is required to
    report diluted earnings per share. However, basic earnings per share
    equals the Company's previously reported earnings per share for the 1996
    and 1995 periods. Basic earnings per share have been computed by dividing
    net income by the weighted average number of shares outstanding during
    the year. Diluted earnings per share have been computed assuming the
    exercise of stock options, as well as their related income tax effects.

    Cash and Cash Equivalents
        At year-end 1997 and 1996, $14,311,000 and $11,858,000, respectively
    of the Company's cash equivalents were invested in a repurchase agreement
    with Thermo Electron. Under this agreement, the Company in effect lends
    excess cash to Thermo Electron, which Thermo Electron collateralizes with
    investments principally consisting of corporate notes, commercial paper,
    U.S. government-agency securities, money market funds, and other
    marketable securities, in the amount of at least 103% of such obligation.

                                        9PAGE
<PAGE>
    ThermoSpectra Corporation                       1997 Financial Statements

                   Notes to Consolidated Financial Statements

    1.  Nature of Operations and Summary of Significant Accounting Policies
        (continued)

    The Company's funds subject to the repurchase agreement are readily
    convertible into cash by the Company. The repurchase agreement earns a
    rate based on the 90-day Commercial Paper Composite Rate plus 25 basis
    points, set at the beginning of each quarter. At year-end 1997 and 1996,
    the Company's cash equivalents also included investments in short-term
    certificates of deposit at the Company's foreign operations, which have
    an original maturity of three months or less. Cash equivalents are
    carried at cost, which equals market value.

    Inventories
        Inventories are stated at the lower of cost (on a first-in, first-out
    basis) or market value and include materials, labor, and manufacturing
    overhead. The components of inventories are as follows:

    (In thousands)                                          1997       1996
    -----------------------------------------------------------------------
    Raw materials and supplies                           $16,850    $12,047
    Work in process                                        7,096      6,941
    Finished goods                                        10,839      8,054
                                                         -------    -------
                                                         $34,785    $27,042
                                                         =======    =======
    Property, Plant, and Equipment
        The costs of additions and improvements are capitalized, while
    maintenance and repairs are charged to expense as incurred. The Company
    provides for depreciation and amortization using the straight-line method
    over the estimated useful lives of the property as follows: buildings and
    improvements, 5 to 30 years; machinery and equipment, 2 to 10 years; and
    leasehold improvements, the shorter of the term of the lease or the life
    of the asset. Property, plant, and equipment consists of the following:

    (In thousands)                                           1997      1996
    -----------------------------------------------------------------------
    Land                                                  $ 3,067   $ 3,372
    Buildings                                               6,910     7,896
    Machinery, equipment, and leasehold improvements       21,131    16,111
                                                          -------   -------
                                                           31,108    27,379
    Less: Accumulated depreciation and amortization        10,717     7,210
                                                          -------   -------
                                                          $20,391   $20,169
                                                          =======   =======
    Patents, Trademarks, and Other Assets
        Patents, trademarks, and other assets in the accompanying balance
    sheet includes the costs of acquired patents and trademarks that are
    amortized using the straight-line method over an estimated useful life of
    3 to 20 years. These assets were $4,826,000 and $4,695,000, net of
    accumulated amortization of $2,135,000 and $1,473,000, at year-end 1997
    and 1996, respectively.
                                        10PAGE
<PAGE>
    ThermoSpectra Corporation                       1997 Financial Statements

                   Notes to Consolidated Financial Statements

    1.  Nature of Operations and Summary of Significant Accounting Policies
        (continued)

    Cost in Excess of Net Assets of Acquired Companies
        The excess of cost over the fair value of net assets of acquired
    companies is amortized using the straight-line method over 40 years.
    Accumulated amortization was $4,927,000 and $2,360,000 at year-end 1997
    and 1996, respectively. The Company assesses the future useful life of
    this asset whenever events or changes in circumstances indicate that the
    current useful life has diminished. The Company considers the future
    undiscounted cash flows of the acquired businesses in assessing the
    recoverability of this asset. If impairment occurs, any excess of
    carrying value over fair value is recorded as a loss.

    Foreign Currency
        All assets and liabilities of the Company's foreign subsidiaries are
    translated at year-end exchange rates, and revenues and expenses are
    translated at average exchange rates for the year in accordance with SFAS
    No. 52, "Foreign Currency Translation." Resulting translation adjustments
    are reflected as a separate component of shareholders' investment titled
    "Cumulative translation adjustment." Foreign currency transaction gains
    and losses are included in the accompanying statement of income and are
    not material for the three years presented.

    Forward Contracts
        The Company uses short-term forward foreign exchange contracts to
    manage exposures related to firm purchase and sale commitments that are
    denominated in currencies other than its subsidiaries' local currencies.
    These contracts principally hedge U.S. dollars, British pound sterling,
    Japanese yen, French francs, and German deutsche marks. Gains and losses
    arising from forward foreign exchange contracts are recorded as an offset
    to the gains and losses resulting from the transactions being hedged. The
    Company does not enter into speculative foreign currency agreements.

    Use of Estimates
        The preparation of financial statements in conformity with generally
    accepted accounting principles requires management to make estimates and
    assumptions that affect the reported amounts of assets and liabilities,
    disclosure of contingent assets and liabilities at the date of the
    financial statements, and the reported amounts of revenues and expenses
    during the reporting period. Actual results could differ from those
    estimates.

    2.  Available-for-sale Investments

        In accordance with SFAS No. 115, "Accounting for Certain Investments
    in Debt and Equity Securities," the Company's marketable equity
    securities are considered available-for-sale investments and are carried
    at market value, with the difference between cost and market value
    recorded currently as a component of shareholders' investment titled
    "Unrealized gain on available-for-sale investments." As of January 3,
    1998, available-for-sale investments represented common stock received in
    connection with the sale of its Linac business (Note 3).

                                        11PAGE
<PAGE>
    ThermoSpectra Corporation                       1997 Financial Statements

                   Notes to Consolidated Financial Statements

    3.  Acquisitions and Disposition

        In July 1997, the Company acquired Sierra Research and Technology
    Inc. (SRT), a manufacturer of systems used for the rework and repair of
    printed circuit boards, for $7,638,000 in cash. The cost of this
    acquisition exceeded the estimated fair value of the net assets by
    $6,368,000. To partially finance the acquisition, the Company borrowed
    $5,000,000 from Thermo Electron (Note 8).
        In March 1997, Thermo Instrument acquired approximately 95% of the
    outstanding shares of Life Sciences International PLC (LSI), a London
    Stock Exchange-listed company. Subsequently, Thermo Instrument acquired
    the remaining shares of LSI capital stock. In July 1997, the Company
    agreed to acquire NESLAB Instruments, Inc. and its related sales and
    service entity, NESLAB Instruments Europa BV in the Netherlands,
    (collectively, NESLAB), a global supplier of temperature-control products
    and former LSI subsidiary, from Thermo Instrument for $76,222,000. The
    purchase price represents the sum of the net tangible book value of the
    business as of June 28, 1997, plus a percentage of Thermo Instrument's
    total cost in excess of net assets acquired associated with its
    acquisition of LSI, based on NESLAB's 1996 revenues relative to LSI's
    1996 consolidated revenues.
        The purchase price consisted of 2,759,042 shares of Company common
    stock valued at $31,315,000 issuable to Thermo Instrument and the
    assumption of $44,907,000 of debt to Thermo Instrument, which was
    subsequently paid. Issuance of the common stock component of the purchase
    price will occur immediately after its listing upon the American Stock
    Exchange, which will require approval by the Company's shareholders.
    Because Thermo Instrument is the Company's majority shareholder and
    intends to vote its shares in favor of such listing, the approval is
    assured. To repay the debt assumed from Thermo Instrument, the Company
    borrowed $45,000,000 from Thermo Electron (Note 8).
        Because the Company and NESLAB were deemed for accounting purposes to
    be under control of their common majority owner, Thermo Instrument, the
    transaction has been accounted for in a manner similar to a pooling of
    interests. Accordingly, the accompanying financial statements include the
    results of NESLAB from March 12, 1997, the date the business was acquired
    by Thermo Instrument, and the shares issuable to Thermo Instrument
    subject to shareholder vote have been deemed outstanding from that date
    for purposes of computing weighted average shares. The purchase price
    included $255,000 for the increase in net book value from the date the
    business was acquired by Thermo Instrument to June 28, 1997. This amount
    was recorded as a reduction in retained earnings. The cost of this
    acquisition exceeded the estimated fair value of the net assets by
    $57,774,000.
        In March 1997, the Company acquired Park Scientific Instruments
    Corporation (PSI), a manufacturer of scanning-probe microscopes used in
    industry and academia to test and measure the topography and other
    surface properties of materials, for $16,702,000 in cash, including the
    repayment of $1,300,000 of bank debt. In addition, the Company assumed
    outstanding PSI stock options, which were converted into stock options
    that are exercisable into 144,941 shares of Company common stock at a
    weighted average exercise price of $3.07 per share, with an aggregate 

                                        12PAGE
<PAGE>
    ThermoSpectra Corporation                       1997 Financial Statements

                   Notes to Consolidated Financial Statements

    3.  Acquisitions and Disposition (continued)

    value of $1,693,000 as of the date of the merger agreement. The cost of
    this acquisition exceeded the estimated fair value of the net assets by
    $14,132,000. To partially finance the acquisition, the Company borrowed
    $10,000,000 from Thermo Electron (Note 8).
        In March 1996, Thermo Instrument acquired a substantial portion of
    the businesses comprising the Scientific Instruments Division of Fisons
    plc (Fisons), a wholly owned subsidiary of Rhone-Poulenc Rorer, Inc.
    Pursuant to an agreement executed in August 1996, the Company acquired
    Kevex Instruments and Kevex X-Ray (the Kevex businesses), which were
    formerly part of Fisons, from Thermo Instrument for $21,567,000 in cash.
    To partially finance the acquisition, the Company borrowed $15,000,000
    from Thermo Electron (Note 8). The purchase price was determined based on
    the net book value of the Kevex businesses at March 29, 1996, and a pro
    rata allocation of Thermo Instrument's total cost in excess of the net
    assets of acquired companies recorded in connection with the acquisition
    of the Fisons businesses. Kevex Instruments is a manufacturer of X-ray
    microanalyzers and X-ray fluorescence instruments and Kevex X-Ray is a
    manufacturer of specialty X-ray sources. 
        Because the Company and the Kevex businesses were deemed for
    accounting purposes to be under control of their common majority owner,
    Thermo Instrument, the transaction has been accounted for in a manner
    similar to a pooling of interests. Accordingly, the Company's 1996
    financial statements include the results of the Kevex businesses from
    March 29, 1996, the date these businesses were acquired by Thermo
    Instrument. The cost of this acquisition exceeded the estimated fair
    value of the net assets by $10,046,000. During 1996, the Company acquired
    two additional companies for an aggregate $900,000 in cash.
        In May 1995, the Company acquired Gould Instrument Systems, Inc.
    (GIS) for $25,758,000 in cash, which included the repayment of $6,000,000
    of bank debt. In 1996, the Company recorded a $1,103,000 reduction in the
    purchase price of GIS (Note 4). To partially finance the acquisition of
    GIS, the Company borrowed $15,000,000 from Thermo Electron pursuant to a
    promissory note that was repaid in August 1995 with proceeds from the
    Company's initial public offering (Note 8). The cost of this acquisition
    exceeded the estimated fair value of the net assets by $9,438,000. GIS
    develops, manufactures, and sells data acquisition systems,
    oscillographic recorders, and digital storage oscilloscopes (DSOs) for
    industrial, medical, scientific, and government applications. During
    1995, the Company acquired one additional company for $2,340,000 in cash.
        Except for the acquisitions of NESLAB and the Kevex businesses, the
    acquisitions described above have been accounted for using the purchase
    method of accounting and their results of operations have been included
    in the accompanying financial statements from their respective dates of
    acquisition. Allocation of the purchase price for these acquisitions was
    based on estimates of the fair value of the net assets acquired and, for
    businesses acquired in 1997, is subject to adjustment. The Company has
    gathered no information that indicates the final allocation will differ
    materially from the preliminary estimates.

                                        13PAGE
<PAGE>
    ThermoSpectra Corporation                       1997 Financial Statements

                   Notes to Consolidated Financial Statements

    3.  Acquisitions and Disposition (continued)

        Based on unaudited data, the following table presents selected
    financial information for the Company and the businesses acquired, on a
    pro forma basis, assuming that the Company, NESLAB, and PSI had been
    combined since the beginning of 1996 and the Company, the Kevex
    businesses, and GIS had been combined since the beginning of 1995. The
    effect of the acquisitions not included in the pro forma data was not
    material to the Company's results of operations or financial position.

    (In thousands except per share amounts)     1997        1996        1995
    ------------------------------------------------------------------------
    Revenues                                $210,412    $202,813    $138,876
    Net income                                 3,736       3,280       1,633
    Earnings per share:
      Basic                                      .25         .22         .15
      Diluted                                    .24         .21         .14

        The pro forma results are not necessarily indicative of future
    operations or the actual results that would have occurred had the
    acquisitions of NESLAB and PSI been made at the beginning of 1996 or the
    acquisitions of the Kevex businesses and GIS been made at the beginning
    of 1995.
        In December 1997, the Company sold its Linac business to SteriGenics
    International, Inc. for $4,980,000 in cash and 109,607 shares of
    SteriGenics common stock valued at $2,056,000, resulting in a gain of
    $2,210,000. The Linac business is an electron beam radiation business
    that offers contract sterilization services.

    4.  Other Nonrecurring Expense, Net

        In 1997, the Company's GIS subsidiary incurred a $953,000
    restructuring charge, related primarily to severance costs for 40
    employees terminated during the year. Other accrued expenses in the
    accompanying balance sheet includes a remaining reserve of $244,000
    associated with these actions.
        In 1996, the Company's GIS subsidiary commenced a $1,038,000
    restructuring plan, which included the termination of approximately 40
    employees.
        In 1996, the Company finalized negotiations in connection with
    amounts claimed for the discontinuance of the Acqulab product line, which
    was sold to the Company as part of the purchase of GIS. Of the $1,970,000
    settlement received, $1,103,000 related to a reduction of the purchase
    price principally for the unrealized earning potential of the Acqulab
    product line, resulting in a reduction of "Cost in excess of net assets
    of acquired companies" in the accompanying 1996 balance sheet. The
    remaining $867,000 related to a reimbursement of expenses incurred
    subsequent to the acquisition of GIS for the ongoing development of
    Acqulab.
        The $867,000 reimbursement and the $1,038,000 restructuring charge
    were recorded as "Other nonrecurring expense, net" in the accompanying
    1996 statement of income.

                                        14PAGE
<PAGE>
    ThermoSpectra Corporation                       1997 Financial Statements

                   Notes to Consolidated Financial Statements

    5.  Employee Benefit Plans

    Stock-based Compensation Plans

    Stock Option Plans
    ------------------
        The Company has stock-based compensation plans for its key employees,
    directors, and others, which permit the grant of a variety of stock and
    stock-based awards as determined by the human resources committee of the
    Company's Board of Directors (the Board Committee), including restricted
    stock, stock options, stock bonus shares, or performance-based shares. To
    date, only nonqualified stock options have been awarded under these
    plans. The option recipients and the terms of options granted under these
    plans are determined by the Board Committee. Generally, options granted
    to date are exercisable immediately, but are subject to certain transfer
    restrictions and the right of the Company to repurchase shares issued
    upon exercise of the options at the exercise price, upon certain events.
    The restrictions and repurchase rights generally lapse ratably over a
    five- to ten-year period, depending on the term of the option, which
    generally ranges from seven to twelve years. Nonqualified stock options
    may be granted at any price determined by the Board Committee, although
    incentive stock options must be granted at not less than the fair market
    value of the Company's common stock on the date of grant. To date, all
    options have been granted at fair market value. The Company also has a
    directors' stock option plan that provides for the grant of stock options
    to outside directors pursuant to a formula approved by the Company's
    shareholders. Options granted under this plan have the same general terms
    as options granted under the stock-based compensation plans described
    above, except that the restrictions and repurchase rights generally lapse
    ratably over a four-year period and the option term is five years. In
    addition to the Company's stock-based compensation plans, certain
    officers and key employees may also participate in the stock-based
    compensation plans of Thermo Electron and Thermo Instrument.




                                        15PAGE
<PAGE>
    ThermoSpectra Corporation                       1997 Financial Statements

                   Notes to Consolidated Financial Statements

    5.  Employee Benefit Plans (continued)

        A summary of the Company's stock option activity is as follows:

                                1997             1996               1995
                          ---------------   ---------------   ---------------
                                 Weighted          Weighted          Weighted
                          Number  Average   Number  Average   Number  Average
                              of Exercise       of Exercise       of Exercise
    (Shares in thousands) Shares    Price   Shares    Price   Shares    Price
    -------------------------------------------------------------------------

    Options outstanding,
      beginning of year      971   $12.10      862   $11.32      578   $10.00

        Issued upon 
          acquisition of
          PSI                145     3.07        -        -        -        -
        Granted              374    10.46      183    15.26      315    13.68
        Exercised           (105)    4.20       (8)   10.00        -        -
        Forfeited           (129)   12.02      (66)   10.89      (31)   10.75
                           -----            ------             -----
    Options outstanding,
      end of year          1,256   $11.23      971   $12.10      862   $11.32
                           =====   ======   ======   ======    =====   ======

    Options exercisable    1,238   $11.35      971   $12.10      862   $11.32
                           =====   ======   ======   ======    =====   ======
    Options available
      for grant              172               121               238
                           =====            ======             =====

       A summary of the status of the Company's stock options at January 3,
    1998, is as follows:

                                          Options Outstanding
                              ------------------------------------------
                                                                Weighted
                                            Weighted Average     Average
           Range of             Number             Remaining    Exercise
    Exercise Prices          of Shares      Contractual Life       Price
    --------------------------------------------------------------------
    (Shares in thousands)

    $ 2.55 - $ 6.20                 56             6.9 years      $ 3.31
      6.21 -   9.85                188             7.8 years        9.53
      9.86 -  13.50                604             7.4 years       10.24
     13.51 -  17.15                408             7.3 years       14.58
                                 -----
    $ 2.55 - $17.15              1,256             7.4 years      $11.23
                                 =====

        The information disclosed above for options outstanding at January 3,
    1998, does not differ materially for options exercisable.
                                        16PAGE
<PAGE>
    ThermoSpectra Corporation                       1997 Financial Statements

                   Notes to Consolidated Financial Statements

    5.  Employee Benefit Plans (continued)

    Employee Stock Purchase Program
    -------------------------------
        Effective November 1, 1996, substantially all of the Company's
    full-time U.S. employees are eligible to participate in an employee stock
    purchase program sponsored by the Company and Thermo Electron, under
    which employees can purchase shares of the Company's and Thermo
    Electron's common stock. Prior to November 1, 1996, the program was
    sponsored by Thermo Instrument and Thermo Electron. Under this program,
    the applicable shares of common stock can be purchased at the end of a
    12-month period at 95% of the fair market value at the beginning of the
    period, and the shares purchased are subject to a six-month resale
    restriction. Prior to November 1, 1995, the applicable shares of common
    stock could be purchased at 85% of the fair market value at the beginning
    of the period, and the shares purchased were subject to a one-year resale
    restriction. Shares are purchased through payroll deductions of up to 10%
    of each participating employee's gross wages. During 1997, the Company
    issued 9,852 shares of its common stock under this program.

    Pro Forma Stock-based Compensation Expense
        In October 1995, the Financial Accounting Standards Board issued SFAS
    No. 123, "Accounting for Stock-Based Compensation," which sets forth a
    fair-value based method of recognizing stock-based compensation expense.
    As permitted by SFAS No. 123, the Company has elected to continue to
    apply APB No. 25 to account for its stock-based compensation plans. Had
    compensation cost for awards granted in 1997, 1996, and 1995 under the
    Company's stock-based compensation plans been determined based on the
    fair value at the grant dates consistent with the method set forth under
    SFAS No. 123, the effect on the Company's net income and earnings per
    share would have been as follows:

    (In thousands except per share amounts)        1997      1996      1995
    -----------------------------------------------------------------------
    Net income:
      As reported                                $5,848    $6,617    $4,594
      Pro forma                                   5,343     6,277     4,475
    Basic earnings per share:
      As reported                                   .40       .53       .41
      Pro forma                                     .36       .50       .40
    Diluted earnings per share:
      As reported                                   .39       .53       .40
      Pro forma                                     .36       .50       .39

        Because the method prescribed by SFAS No. 123 has not been applied to
    options granted prior to January 1, 1995, the resulting pro forma
    compensation expense may not be representative of the amount to be
    expected in future years. Pro forma compensation expense for options
    granted is reflected over the vesting period; therefore, future pro forma
    compensation expense may be greater as additional options are granted.

                                        17PAGE
<PAGE>
    ThermoSpectra Corporation                       1997 Financial Statements

                   Notes to Consolidated Financial Statements

    5.  Employee Benefit Plans (continued)

        The weighted average fair value per share of options granted was
    $3.74, $5.80, and $5.93 in 1997, 1996, and 1995, respectively. The fair
    value of each option grant was estimated on the grant date using the
    Black-Scholes option-pricing model with the following weighted-average
    assumptions:

                                            1997          1996         1995
    -----------------------------------------------------------------------
    Volatility                               28%           26%          26%
    Risk-free interest rate                 5.9%          6.6%         6.4%
    Expected life of options           5.0 years     5.4 years    6.7 years

        The Black-Scholes option-pricing model was developed for use in
    estimating the fair value of traded options which have no vesting
    restrictions and are fully transferable. In addition, option-pricing
    models require the input of highly subjective assumptions, including
    expected stock price volatility. Because the Company's employee stock
    options have characteristics significantly different from those of traded
    options, and because changes in the subjective input assumptions can
    materially affect the fair value estimate, in management's opinion, the
    existing models do not necessarily provide a reliable single measure of
    the fair value of its employee stock options.

    401(k) Savings Plans
        Substantially all of the Company's full-time U.S. employees are
    eligible to participate in a 401(k) savings plan. Contributions to the
    401(k) savings plans are made by both the employee and the Company.
    Company contributions are based upon the level of employee contributions.
    For these plans, the Company contributed and charged to expense
    $1,427,000, $689,000, and $493,000 in 1997, 1996, and 1995, respectively.

    6.  Income Taxes

        The components of income before provision for income taxes are as
    follows:

    (In thousands)                                  1997      1996      1995
    ------------------------------------------------------------------------
    Domestic                                     $10,719   $ 8,969   $ 5,835
    Foreign                                         (319)    1,918     2,071
                                                 -------   -------   -------
                                                 $10,400   $10,887   $ 7,906
                                                 =======   =======   =======

                                        18PAGE
<PAGE>
    ThermoSpectra Corporation                       1997 Financial Statements

                   Notes to Consolidated Financial Statements

    6.  Income Taxes (continued)

        The components of the provision for income taxes are as follows:

    (In thousands)                                1997      1996      1995
    ----------------------------------------------------------------------
    Currently payable:
      Federal                                   $3,834    $3,427    $1,651
      State                                        600       774       349
      Foreign                                      158       865     1,237
                                                ------    ------    ------
                                                 4,592     5,066     3,237
                                                ------    ------    ------
    Net deferred (prepaid):
      Federal                                     (112)     (608)      125
      State                                        (24)     (129)       27
      Foreign                                       96       (59)      (77)
                                                ------    ------    ------
                                                   (40)     (796)       75
                                                ------    ------    ------
                                                $4,552    $4,270    $3,312
                                                ======    ======    ======

        The provision for income taxes that is currently payable does not
    reflect $1,024,000 of tax benefits used to reduce cost in excess of net
    assets of acquired companies in 1996. In addition, the Company receives a
    tax deduction upon exercise of nonqualified stock options by employees
    for the difference between the exercise price and the market price of the
    underlying common stock on the date of exercise. The provision for income
    taxes that is currently payable does not reflect $304,000, $382,000, and
    $89,000 of such benefits that have been allocated to capital in excess of
    par value in 1997, 1996, and 1995, respectively.
        The provision for income taxes in the accompanying statement of
    income differs from the provision calculated by applying the statutory
    federal income tax rate of 34% to income before provision for income
    taxes due to the following:

    (In thousands)                                1997      1996      1995
    ----------------------------------------------------------------------
    Provision for income taxes at
      statutory rate                            $3,536    $3,702    $2,688
    Increases (decreases) resulting from:
      State income taxes, net of federal tax       380       426       248
      Net foreign losses not benefited and
        tax rate differential                      362       154       456
      Tax benefit of foreign sales
        corporation                               (295)     (268)     (201)
      Amortization of cost in excess of net
        assets of acquired companies               685       146       155
      Other, net                                  (116)      110       (34)
                                                ------    ------    ------
                                                $4,552    $4,270    $3,312
                                                ======    ======    ======
                                        19PAGE
<PAGE>
    ThermoSpectra Corporation                       1997 Financial Statements

                   Notes to Consolidated Financial Statements

    6.  Income Taxes (continued)

        Prepaid income taxes and deferred income taxes in the accompanying
    balance sheet consist of the following:

    (In thousands)                                 1997      1996
    -------------------------------------------------------------
    Prepaid income taxes:
      Tax loss carryforwards                    $ 9,052   $ 9,334
      Reserves and accruals                       3,800     3,726
      Inventory basis difference                  3,185     1,983
      Allowance for doubtful accounts               352       222
                                                -------   -------
                                                 16,389    15,265
      Less: Valuation allowance                   9,052     9,334
                                                -------   -------
                                                $ 7,337   $ 5,931
                                                =======   =======
    Deferred income taxes:
      Intangible assets                         $   333   $   176
      Other                                          23        92
                                                -------   -------
                                                $   356   $   268
                                                =======   =======

        At year-end 1997, the Company had foreign and federal tax loss
    carryforwards of $21,905,000 and $6,088,000, respectively. The valuation
    allowance relates to uncertainty surrounding the realization of the tax
    loss carryforwards, for which realization is limited to the future income
    of certain subsidiaries. The federal tax loss carryforwards expire in the
    years 2008 through 2010. The foreign tax loss carryforwards do not
    expire. Any resulting benefit from the loss carryforwards will first be
    used to reduce "Cost in excess of net assets of acquired companies," with
    any remaining benefit used to reduce other acquired intangible assets.
        A provision has not been made for U.S. or additional foreign taxes on
    $4,239,000 of undistributed earnings of foreign subsidiaries that could
    be subject to taxation if remitted to the U.S. because the Company
    currently plans to keep these amounts permanently reinvested overseas.

    7.  Commitments and Contingencies

    Operating Leases
        The Company leases portions of its office and operating facilities
    under various operating lease arrangements. The accompanying statement of
    income includes expenses from operating leases of $2,171,000, $2,818,000,
    and $2,066,000 in 1997, 1996, and 1995, respectively, net of sublease
    income of $893,000 and $185,000 in 1997 and 1996, respectively. Future
    minimum payments due under noncancelable operating leases at January 3,
    1998, were $2,611,000 in 1998; $2,172,000 in 1999; $1,851,000 in 2000;
    $1,382,000 in 2001; $1,067,000 in 2002; and $2,473,000 in 2003 and
    thereafter. Total future minimum lease payments are $11,556,000 and have
    not been reduced by minimum sublease rental income of $2,248,000 due
    through 2001 under noncancelable operating subleases. See Note 8 for
    office and manufacturing space leased from related parties.
                                        20PAGE
<PAGE>
    ThermoSpectra Corporation                       1997 Financial Statements

                   Notes to Consolidated Financial Statements

    7.  Commitments and Contingencies (continued)

    Contingencies
        The Company has received correspondence alleging that certain of its
    products infringe patents owned by third parties, though no lawsuits have
    been filed. The Company does not believe that its products infringe the
    intellectual property rights of these parties; however, given the
    inherent uncertainty of dispute resolution, there can be no assurance
    that the outcome of any such lawsuit, if filed, would not result in a
    material adverse effect on the Company's results of operations or
    financial position.

    8.  Related-party Transactions

    Corporate Services Agreement
        The Company and Thermo Electron have a corporate services agreement
    under which Thermo Electron's corporate staff provides certain
    administrative services, including certain legal advice and services,
    risk management, certain employee benefit administration, tax advice and
    preparation of tax returns, centralized cash management, and certain
    financial and other services, for which the Company paid Thermo Electron
    annually an amount equal to 1.0% of the Company's revenues in 1997 and
    1996 and 1.2% of the Company's revenues in 1995. For these services, the
    Company was charged $1,989,000, $1,232,000, and $1,101,000 in 1997, 1996,
    and 1995, respectively. Beginning in 1998, the Company will pay an annual
    fee equal to 0.8% of the Company's revenues. The annual fee is reviewed
    and adjusted annually by mutual agreement of the parties. Management
    believes that the service fee charged by Thermo Electron is reasonable
    and that such fees are representative of the expenses the Company would
    have incurred on a stand-alone basis. The corporate services agreement is
    renewed annually but can be terminated upon 30 days' prior notice by the
    Company or upon the Company's withdrawal from the Thermo Electron Charter
    defines the relationship among Thermo Electron and its majority-owned
    subsidiaries). For additional items such as employee benefit plans,
    insurance coverage, and other identifiable costs, Thermo Electron charges
    the Company based upon costs attributable to the Company.

    Operating Leases
        In addition to the operating leases discussed in Note 7, the Company
    leases certain office and manufacturing space from Nicolet Instrument
    Corporation (Nicolet), a wholly owned subsidiary of Thermo Optek
    Corporation, and Shandon Inc., a wholly owned subsidiary of Thermo
    Instrument. The accompanying statement of income includes expenses from
    these operating leases of $602,000, $208,000, and $218,000 in 1997, 1996,
    and 1995, respectively. The lease with Nicolet is effective until
    December 31, 1998, but may be terminated by the Company upon 90 days'
    prior notice to Nicolet, and the lease with Shandon expires in September
    2000. At January 3, 1998, future minimum payments due under these leases
    are $884,000 in 1998, $675,000 in 1999, and $506,000 in 2000. Total
    future minimum lease payments under these leases are $2,065,000.

                                        21PAGE
<PAGE>
    ThermoSpectra Corporation                       1997 Financial Statements

                   Notes to Consolidated Financial Statements

    8.  Related-party Transactions (continued)

    Other Related-party Transactions
        The Company purchases and sells products and services in the ordinary
    course of business with other companies affiliated with Thermo Electron.
    Sales of products to such affiliated companies totaled $825,000,
    $240,000, and $118,000 in 1997, 1996, and 1995, respectively. Purchases
    of products and services from such affiliated companies totaled
    $2,226,000, $1,310,000, and $1,090,000 in 1997, 1996, and 1995,
    respectively.

    Repurchase Agreement
        The Company invests excess cash in a repurchase agreement with Thermo
    Electron as discussed in Note 1.

    Short- and Long-term Obligations
        The accompanying balance sheet includes the following amounts
    borrowed from Thermo Instrument and Thermo Electron to finance the
    acquisitions of certain companies (Note 3):

    (In thousands)                                      1997         1996
    ---------------------------------------------------------------------
    Promissory notes to Thermo Electron, due:
      August 1998                                    $15,000      $15,000
      March 1999                                      10,000            -
      July 1999                                       45,000            -
      July 1999                                        5,000            -
    Promissory note to Thermo Instrument, due
      September 2001                                   7,300        7,300
                                                     -------      -------
                                                     $82,300      $22,300
                                                     =======      =======

        These notes bear interest at the 90-day Commercial Paper Composite
    Rate plus 25 basis points, set at the beginning of each quarter. The
    interest rate for the notes outstanding at year-end 1997 and 1996 was
    5.76% and 5.77%, respectively. In addition, in connection with the May
    1995 acquisition of GIS, the Company borrowed $15,000,000 from Thermo
    Electron pursuant to a promissory note that was repaid in August 1995
    with proceeds from the Company's initial public offering (Note 10).

    9.  Note Payable

        Note payable in the accompanying 1996 balance sheet represents
    borrowings under a 1.2 million British pounds sterling line of credit
    facility. The interest rate for this line of credit was 8.0% and 7.0% at
    January 3, 1998, and December 28, 1996, respectively. Unused amounts
    available under this and other lines of credit available to the Company's
    foreign subsidiaries were $3,249,000 as of January 3, 1998.

                                        22PAGE
<PAGE>
    ThermoSpectra Corporation                       1997 Financial Statements

                   Notes to Consolidated Financial Statements

    10. Common Stock

        In 1995, the Company sold 1,725,000 shares of its common stock in its
    initial public offering at $14.00 per share for net proceeds of
    $21,858,000, and the Company sold an additional 202,000 shares of its
    common stock in a private placement at $15.72 per share for net proceeds
    of $3,022,000.
        At January 3, 1998, the Company had reserved 1,594,000 unissued
    shares of its common stock for possible issuance under stock-based
    compensation plans.

    11. Fair Value of Financial Instruments

        The Company's financial instruments consist primarily of cash and
    cash equivalents, available-for-sale investments, accounts receivable,
    note payable to Thermo Electron, note payable, accounts payable, due to
    affiliated companies, long-term obligations due to Thermo Electron and
    Thermo Instrument, and forward foreign exchange contracts. The Company's
    long-term obligations (Note 8) bear interest at a variable market rate
    and therefore the carrying amounts approximate fair value. The carrying
    amounts of the Company's remaining financial instruments, with the
    exception of available-for-sale investments and forward foreign exchange
    contracts, approximate fair value due to their short-term nature.
        Available-for-sale investments are carried at fair value in the
    accompanying balance sheet. The fair values were determined based on
    quoted market prices (Note 2).
        The Company has forward foreign exchange contracts of $2,041,000 and
    $2,185,000 outstanding at year-end 1997 and 1996, respectively. The fair
    value of the Company's forward foreign exchange contracts receivable was
    $3,000 and $138,000 at year-end 1997 and 1996, respectively. The fair
    value of such contracts is the estimated amount that the Company would
    receive upon termination of the contracts, taking into account the change
    in foreign exchange rates.



                                        23PAGE
<PAGE>
   ThermoSpectra Corporation                        1997 Financial Statements

                   Notes to Consolidated Financial Statements

   12. Geographical Information

       The Company is engaged in one business segment: developing,
   manufacturing, and marketing imaging and inspection, temperature-control,
   and test and measurement instruments. The following table shows data for
   the Company by geographical area:
   (In thousands)                                   1997      1996      1995
   -------------------------------------------------------------------------
   Revenues:
       United States                            $176,717  $ 94,493  $ 63,675
       Germany                                    12,217    14,673    12,952
       England                                    12,546    14,260    12,759
       Other Europe                               17,930    13,698    14,545
       Other                                       7,463     5,593     3,609
       Transfers among geographical areas (a)    (27,973)  (19,518)  (15,826)
                                                --------  --------   -------
                                                $198,900  $123,199  $ 91,714
                                                ========  ========  ========
   Income before provision for income taxes:
       United States (b)                        $ 15,106  $  9,072  $  5,586
       Germany                                       (13)      867       975
       England                                      (406)      253       (70)
       Other Europe                                  128       697     1,297
       Other                                        (890)     (164)        5
                                                --------  --------  --------
       Total operating income                     13,925    10,725     7,793
       Interest income (expense), net             (3,525)      162       113
                                                --------  --------  --------
                                                $ 10,400  $ 10,887  $  7,906
                                                ========  ========  ========
   Identifiable assets:
       United States                            $220,590  $121,891  $ 89,951
       Germany                                     7,118     8,968     8,881
       England                                     7,207     9,142     9,707
       Other Europe                               13,902    10,210    13,060
       Other                                       4,580     2,274     1,318
                                                --------  --------  --------
                                                $253,397  $152,485  $122,917
                                                ========  ========  ========

   Export revenues included in United States
     revenues above (c):
       Asia                                     $ 28,304  $ 19,102  $  8,195
       Europe                                     25,093    13,300    13,003
       Other                                       6,036     4,070     5,400
                                                --------  --------  --------
                                                $ 59,433  $ 36,472  $ 26,598
                                                ========  ========  ========

   (a) Transfers among geographical areas are accounted for at prices that
       are representative of transactions with unaffiliated parties.
   (b) Includes corporate general and administrative expenses.
   (c) In general, export sales are denominated in U.S. dollars.
                                        24PAGE
<PAGE>
    ThermoSpectra Corporation                       1997 Financial Statements

                   Notes to Consolidated Financial Statements

    13. Earnings per Share

        Basic and diluted earnings per share were calculated as follows:

    (In thousands except per share amounts)    1997        1996        1995
    -----------------------------------------------------------------------
    Basic
    Net income                              $ 5,848     $ 6,617     $ 4,594
                                            -------     -------     -------

    Weighted average shares                  12,488      12,437      11,229
    Shares issuable for acquisition
      of NESLAB                               2,206           -           -
                                            -------     -------     -------
    Weighted average shares, as adjusted     14,694      12,437      11,229
                                            -------     -------     -------

    Basic earnings per share                $   .40     $   .53     $   .41
                                            =======     =======     =======

    Diluted
    Net income                              $ 5,848     $ 6,617     $ 4,594
                                            -------     -------     -------

    Basic weighted average shares            14,694      12,437      11,229
    Effect of stock options                     112         133         127
                                            -------     -------     -------
    Weighted average shares, as adjusted     14,806      12,570      11,356
                                            -------     -------     -------

    Diluted earnings per share              $   .39     $   .53     $   .40
                                            =======     =======     =======

        The computation of diluted earnings per share for 1997 and 1996
    excludes the effect of assuming the exercise of certain outstanding stock
    options because the effect would be antidilutive. As of January 3, 1998,
    there were 410,400 of such options outstanding, with exercise prices
    ranging form $13.78 to $17.15 per share. 
                                        25PAGE
<PAGE>
    ThermoSpectra Corporation                       1997 Financial Statements

                   Notes to Consolidated Financial Statements

    14. Unaudited Quarterly Information

    (In thousands except per share amounts)

    1997                           First(a)  Second      Third     Fourth(b)
    ------------------------------------------------------------------------
    Revenues                     $37,177    $49,692    $52,271    $59,760
    Gross profit                  16,275     21,702     20,249     24,927
    Net income                     1,188      1,337        705      2,618
    Basic and diluted
      earnings per share             .09        .09        .05        .17

    1996                           First     Second(c)   Third     Fourth
    ---------------------------------------------------------------------
    Revenues                     $26,927    $31,281    $30,329    $34,662
    Gross profit                  12,788     15,080     15,092     17,339
    Net income                     1,436      1,562      1,690      1,929
    Earnings per share:
      Basic                          .12        .13        .14        .16
      Diluted                        .11        .12        .13        .15

    (a) Reflects the March 1997 acquisitions of NESLAB and PSI.
    (b) Reflects a $2,210,000 gain from the sale of the Company's Linac
        business.
    (c) Reflects the March 1997 acquisition of Kevex Instruments and Kevex
        X-Ray.






                                        26PAGE
<PAGE>
    ThermoSpectra Corporation                       1997 Financial Statements

                    Report of Independent Public Accountants

    To the Shareholders and Board of Directors of ThermoSpectra Corporation:

        We have audited the accompanying consolidated balance sheet of
    ThermoSpectra Corporation (a Delaware corporation and 77%-owned
    subsidiary of Thermo Instrument Systems Inc.) and subsidiaries as of
    January 3, 1998, and December 28, 1996, and the related consolidated
    statements of income, shareholders' investment, and cash flows for each
    of the three years in the period ended January 3, 1998. These
    consolidated financial statements are the responsibility of the Company's
    management. Our responsibility is to express an opinion on these
    consolidated financial statements based on our audits.
        We conducted our audits in accordance with generally accepted
    auditing standards. Those standards require that we plan and perform the
    audit to obtain reasonable assurance about whether the consolidated
    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 consolidated financial statements referred to
    above present fairly, in all material respects, the financial position of
    ThermoSpectra Corporation and subsidiaries as of January 3, 1998, and
    December 28, 1996, and the results of their operations and their cash
    flows for each of the three years in the period ended January 3, 1998, in
    conformity with generally accepted accounting principles.



                                                Arthur Andersen LLP



    Boston, Massachusetts
    February 17, 1998 



                                       27PAGE
<PAGE>
    ThermoSpectra Corporation                       1997 Financial Statements

                     Management's Discussion and Analysis of
                  Financial Condition and Results of Operations

        Forward-looking statements, within the meaning of Section 21E of the
    Securities Exchange Act of 1934, are made throughout this Management's
    Discussion and Analysis of Financial Condition and Results of Operations.
    For this purpose, any statements contained herein that are not statements
    of historical fact may be deemed to be forward-looking statements.
    Without limiting the foregoing, the words "believes," "anticipates,"
    "plans," "expects," "seeks," "estimates," and similar expressions are
    intended to identify forward-looking statements. There are a number of
    important factors that could cause the results of the Company to differ
    materially from those indicated by such forward-looking statements,
    including those detailed immediately after this Management's Discussion
    and Analysis of Financial Condition and Results of Operations under the
    heading "Forward-looking Statements."

    Overview

        The Company develops, manufactures, and markets imaging and
    inspection, temperature-control, and test and measurement instruments.
    These instruments are generally combined with proprietary operations and
    analysis software to provide industrial and research customers with
    integrated systems that address their specific needs. The Company's
    products include test and measurement systems consisting of digital
    oscillographic recorders, digital storage oscilloscopes (DSOs), and data-
    acquisition systems; X-ray microanalyzers; X-ray fluorescence
    instruments; nondestructive X-ray inspection systems; specialty X-ray
    tubes; and confocal laser scanning microscopes. In 1997, the Company
    broadened its product offerings through the acquisition of Park
    Scientific Instruments Corporation (PSI), a manufacturer of
    scanning-probe microscopes; NESLAB Instruments, Inc. (NESLAB), a supplier
    of temperature-control products; and Sierra Research and Technology Inc.
    (SRT), a manufacturer of systems used for the rework and repair of
    printed circuit boards.
        The Company's growth strategy includes acquiring complementary
    businesses, developing new applications for its technology to address
    related market segments, and strengthening its presence in selected
    geographic markets. Because the Company competes primarily on the basis
    of its technology, it will also need to continually improve the
    technology underlying the products of any company it acquires.
        The Company conducts all of its manufacturing operations in the
    United States, except for the production of certain DSOs that are
    manufactured in England. The Company sells its products worldwide. During
    1997, exports from the Company's U.S. and foreign subsidiaries to the Far
    East represented 15% of total revenues. Exports to Japan represented 8%
    of total revenues and exports to Taiwan, South Korea, and Singapore,
    collectively, represented 5% of total revenues. Asia is experiencing a
    severe economic crisis, which has been characterized by sharply reduced
    economic activity and liquidity, highly volatile
    foreign-currency-exchange and interest rates, and unstable stock markets.
    The Company's sales in Asia could be adversely affected by the unstable
    economic conditions there. Additionally, certain of the Company's
                                        28PAGE
<PAGE>
    ThermoSpectra Corporation                       1997 Financial Statements

                     Management's Discussion and Analysis of
                  Financial Condition and Results of Operations

    Overview (continued)

    customers located outside of the Asian region could be adversely affected
    by the unstable economic conditions in Asia.
        The Company anticipates that a significant portion of its revenues
    will be from sales to customers outside the United States. The Company's
    business activities outside the United States are conducted through sales
    and service subsidiaries and through third-party representatives and
    distributors. The results of the Company's international operations are
    subject to foreign currency fluctuations, and the exchange rate value of
    the dollar may have a significant impact on both revenues and earnings.
    The Company may use forward contracts to reduce its exposure to currency
    fluctuations.

    Results of Operations

    1997 Compared With 1996
        Revenues were $198.9 million in 1997, compared with $123.2 million in
    1996, an increase of 61%. Revenues increased $76.6 million due to the
    inclusion of revenues from NESLAB, which was acquired for accounting
    purposes effective March 1997; PSI, which was acquired in March 1997; and
    SRT, which was acquired in July 1997; and the inclusion of revenues for
    the full year from Kevex Instruments, a manufacturer of X-ray
    microanalyzers and X-ray fluorescence instruments, and Kevex X-Ray, a
    manufacturer of specialty X-ray sources (the Kevex businesses), which
    were acquired effective March 1996 (Note 3). Excluding the impact of
    acquisitions and foreign currency translation, revenues from existing
    operations increased 2% in 1997 compared with 1996. Revenues increased an
    aggregate of $8.5 million due to higher demand for inspection systems
    manufactured by the Company's Nicolet Imaging Systems division (NIS) and
    X-ray tubes manufactured by the Company's Kevex X-Ray subsidiary. These
    increases were partially offset by a $2.5 million decline in demand for
    test and measurement systems and a $2.4 million decrease in revenues at
    the Company's NORAN Instrument subsidiary due to a decline in demand for
    confocal laser scanning microscopes. Revenues were adversely affected by
    approximately $3.5 million due to the strengthening in the value of the
    U.S. dollar relative to currencies in foreign countries in which the
    Company operates.
        The gross profit margin declined to 42% in 1997 from 49% in 1996. The
    decline in the gross profit margin is primarily attributable to the
    inclusion of lower-margin revenues from NESLAB, which had a gross profit
    margin of 36% in 1997, and to an eight percentage-point deterioration in
    margin levels at NIS due to an inventory write-off in the third quarter
    of 1997 and a change in mix from higher-margin manual systems to
    lower-margin automated systems. To a lesser extent, the gross margin was
    adversely impacted in 1997 by a deterioration in the gross profit margin
    for the Company's test and measurement systems and at NORAN due in part
    to the strengthening of the U.S. dollar.
        Selling, general, and administrative expenses as a percentage of
    revenues decreased to 27% in 1997 from 30% in 1996, primarily due to the 

                                       29PAGE
<PAGE>
    ThermoSpectra Corporation                       1997 Financial Statements

                     Management's Discussion and Analysis of
                  Financial Condition and Results of Operations

    1997 Compared With 1996 (continued)
    inclusion of lower selling expenses as a percentage of revenues at NESLAB
    and, to a lesser extent, lower selling, general, and administrative
    expenses at Gould Instrument Systems Inc. (GIS) as a result of ongoing
    expense reductions, including restructuring charges taken in 1997 that
    reduced employee cost levels at that subsidiary (Note 4). These
    improvements were offset in part by the inclusion of higher selling,
    general, and administrative expenses as a percentage of revenues at PSI
    and a higher relative expense level at NORAN primarily due to lower
    revenues.
        Research and development expenses as a percentage of revenues
    decreased to 8.7% in 1997 from 10.5% in 1996, due to the inclusion of
    NESLAB and overall reduced research and development spending levels at
    the Company's existing operations.
        Other nonrecurring expense, net, in 1997 primarily represents charges
    incurred by GIS relating to severance costs for employees terminated
    during the year (Note 4). Other nonrecurring expense, net, in 1996
    represents a $1.0 million restructuring reserve recorded at GIS offset in
    part by $0.9 million, of an aggregate settlement with the prior owner of
    GIS of $2.0 million, for costs incurred by GIS in connection with its
    Acqulab product line (Note 4).
        Gain on sale of business in 1997 represents the sale of NIS' Linac
    business in December 1997 to SteriGenics International Inc. for $5.0
    million in cash and 109,607 shares of SteriGenics common stock valued at
    $2.1 million. The Linac business, which had revenues and operating income
    in 1997 of $3.7 million and $1.2 million, respectively, is an electron
    beam radiation business that offers contract sterilization services.
        Interest income decreased to $0.7 million in 1997 from $0.9 million
    in 1996 due to lower invested cash balances as a result of cash used to
    partially fund the acquisitions of the Kevex businesses, which was paid
    to Thermo Instrument Systems Inc. in August 1996, and the acquisition of
    PSI in March 1997. Interest expense, related party, increased to $4.2
    million in 1997 from $0.8 million in 1996 due to borrowings from Thermo
    Electron Corporation to fund acquisitions (Note 8).
        The effective tax rate was 44% in 1997, compared with 39% in 1996.
    The effective tax rates exceeded the statutory federal income tax rate
    primarily due to the impact of state income taxes, nondeductible
    amortization of cost in excess of net assets of acquired companies for
    certain of the Company's acquisitions and, in 1997, the inability to
    benefit losses at certain of the Company's foreign subsidiaries. The
    increase in the effective tax rate in 1997 was due to the impact of
    nondeductible amortization of cost in excess of net assets of acquired
    companies from the acquisitions of NESLAB and PSI and increased losses at
    certain of the Company's foreign subsidiaries that were not benefited.
        See Note 7 for a description of certain patent infringement matters
    involving the Company.
        The Company is currently assessing the potential impact of the year
    2000 on the processing of date-sensitive information by the Company's
    computerized information systems and on products sold as well as products
    purchased by the Company. The Company believes that its internal
    information systems and current products are either year 2000 compliant
    or will be so prior to the year 2000 without incurring material costs.
                                        30PAGE
<PAGE>
    ThermoSpectra Corporation                       1997 Financial Statements

                     Management's Discussion and Analysis of
                  Financial Condition and Results of Operations

    1997 Compared With 1996 (continued)
    There can be no assurance, however, that the Company will not experience
    unexpected costs and delays in achieving year 2000 compliance for its
    internal information systems and current products, which could result in
    a material adverse effect on the Company's future results of operations.
        The Company is presently assessing the effect that the year 2000
    problem may have on its previously sold products. The Company is also
    assessing whether its key suppliers are adequately addressing this issue
    and the effect this might have on the Company. The Company has not
    completed its analysis and is unable to conclude at this time that the
    year 2000 problem as it relates to its previously sold products and
    products purchased from key suppliers is not reasonably likely to have a
    material adverse effect on the Company's future results of operations.

    1996 Compared With 1995
        Revenues were $123.2 million in 1996, compared with $91.7 million in
    1995, an increase of 34%. Revenues increased due to the inclusion of
    $18.0 million of revenues from the acquisition of the Kevex businesses
    and $9.6 million of incremental revenues from GIS, acquired in May 1995
    (Note 3). Revenues at GIS for the last six months of 1996 declined by
    approximately 14% from the comparable period in 1995, due to a decrease
    in demand for GIS products. Revenues from the Company's other operations
    increased approximately 9% in 1996, compared with 1995, due to the
    inclusion of $2.3 million of revenues related to shipments of airbag
    inspection systems, overall higher demand for X-ray inspection systems at
    NIS, and increased demand for products sold by NORAN. Revenues were
    negatively affected by approximately $1.6 million in 1996 due to the
    strengthening in the value of the U.S. dollar relative to the Japanese
    yen and other foreign currencies in countries where the Company operates.
        The gross profit margin was 49% in both 1996 and 1995. Higher gross
    profit margins at the Company's test and measurement businesses, due to
    changes in product mix and manufacturing efficiencies, were offset by a
    lower gross profit margin at NIS due to higher material costs and the
    inclusion of lower-margin revenues from airbag inspection systems, the
    inclusion of revenues from the Kevex businesses which had a combined
    gross profit margin of 42%, and the strengthening in the value of the
    U.S. dollar.
        Selling, general, and administrative expenses as a percentage of
    revenues decreased to 30% in 1996 from 31% in 1995 due to the inclusion
    of lower selling expenses as a percentage of revenues at Kevex X-Ray.
    Research and development expenses as a percentage of revenues were
    unchanged at 10% in both 1996 and 1995.
        Interest income increased to $0.9 million in 1996 from $0.8 million
    in 1995, principally due to overall higher cash balances in 1996.
    Interest expense, related party in 1996 represents interest expense
    associated with a $7.3 million promissory note issued to Thermo
    Instrument in September 1994 and a $15.0 million promissory note issued
    to Thermo Electron in August 1996 (Note 8). Interest expense, related
    party in 1995 represents interest expense associated with the $7.3
    million promissory note issued to Thermo Instrument and a $15.0 million
    promissory note issued to Thermo Electron in May 1995. The $15.0 million
    promissory note issued in May 1995 was repaid in August 1995.
                                        31PAGE
<PAGE>
    ThermoSpectra Corporation                       1997 Financial Statements

                     Management's Discussion and Analysis of
                  Financial Condition and Results of Operations

    1996 Compared With 1995 (continued)
        The effective tax rate decreased to 39% in 1996 from 42% in 1995.
    These rates exceeded the statutory federal income tax rate primarily due
    to the impact of state and foreign income taxes and the nondeductible
    amortization of cost in excess of net assets of acquired companies for
    certain of the Company's acquisitions. The effective tax rate decreased
    in 1996 principally as a result of a lower percentage of the Company's
    income generated in countries with higher tax rates.

    Liquidity and Capital Resources
        Consolidated working capital was $53.5 million at January 3, 1998,
    compared with $44.7 million at December 28, 1996. Included in working
    capital are cash, cash equivalents, and short-term investments of $22.8
    million at January 3, 1998, compared with $16.6 million at December 28,
    1996. Net cash provided by operating activities was $8.4 million in 1997.
    The Company used $8.8 million during the year to reduce its current
    liabilities. A reduction in inventories provided $4.9 million.
        The Company's investing activities used $19.6 million of cash in
    1997. The Company used $21.1 million, net of cash acquired, for
    acquisitions and received $5.0 million in cash and $2.1 million of
    SteriGenics common stock for the sale of the Company's Linac business
    (Note 3). During 1997, the Company expended $2.6 million for the purchase
    of property, plant, and equipment. The Company plans to expend
    approximately $4.0 million for the purchase of property, plant, and
    equipment in 1998.
        During 1997, the Company's financing activities provided $15.0
    million of cash. In September 1997, the Company borrowed $45.0 million
    from Thermo Electron pursuant to a promissory note due July 1999. The
    Company used the proceeds from this note to repay the $44.9 million of
    debt assumed in connection with the NESLAB acquisition. In connection
    with the March 1997 acquisition of PSI, the Company borrowed
    $10.0 million from Thermo Electron pursuant to a promissory note due
    March 1999. In connection with the July 1997 acquisition of SRT, the
    Company borrowed $5.0 million from Thermo Electron pursuant to a
    promissory note due July 1999. These notes bear interest at the 90-day
    Commercial Paper Composite Rate plus 25 basis points, set at the
    beginning of each quarter.
        Although the Company expects to generate positive cash flow from its
    existing operations, the Company anticipates that it may require
    significant amounts of cash to pursue the acquisition of complementary
    businesses. The Company expects that it would seek to finance any such
    acquisitions through a combination of internal funds, additional equity
    financing or convertible debt financing from the capital markets, and/or
    borrowings from Thermo Instrument or Thermo Electron, although it has no
    agreement with these companies to ensure that any additional funds will
    be available on acceptable terms or at all. The Company believes that its
    existing resources and cash provided by operations are sufficient to meet
    the capital requirements of its existing businesses for the foreseeable
    future. Thermo Electron has indicated that it will seek repayment of the
    notes due to it in 1998 and 1999 only to the extent the Company's cash
    flow permits such repayment.

                                        32PAGE
<PAGE>
    ThermoSpectra Corporation                       1997 Financial Statements

                           Forward-looking Statements

        In connection with the "safe harbor" provisions of the Private
    Securities Litigation Reform Act of 1995, the Company wishes to caution
    readers that the following important factors, among others, in some cases
    have affected, and in the future could affect, the Company's actual
    results and could cause its actual results in 1998 and beyond to differ
    materially from those expressed in any forward-looking statements made
    by, or on behalf of, the Company.

        Uncertainty of Growth. Certain of the markets in which the Company
    competes have been flat or declining over the past several years. The
    Company has identified a number of strategies it believes will allow it
    to grow its business, including: acquiring complementary businesses,
    developing new applications for its technologies, and strengthening its
    presence in selected geographic markets. No assurance can be given that
    the Company will be able to successfully implement these strategies, or
    that these strategies will result in growth of the Company's business.

        Potential Increased Competition. The Company predominantly sells its
    products in the high-performance segment of the markets in which it
    competes. The products in this segment are generally characterized by
    superior engineering and performance and compete more on product
    specifications than on price. The other segments of these markets are
    dominated by companies with substantially greater financial resources
    than those of the Company. If these larger companies enter the
    high-performance segment of the market, no assurance can be given that
    the Company will be able to successfully compete against them.

        Need to Respond to Technological Change. Many of the Company's
    products are marketed primarily based on their technologies. In order to
    be successful, the Company believes that it will be important to
    continually improve the technology underlying its products. No assurance
    can be given that the Company will be able to do so or that a competitor
    of the Company will not develop technology or products that will render
    the Company's competing products noncompetitive or obsolete.

        Risks Associated with Acquisition Strategy. The Company's strategy
    includes the acquisition of underperforming businesses and technologies
    that complement or augment the Company's existing product lines.
    Promising acquisitions are difficult to identify and complete for a
    number of reasons, including competition among prospective buyers and the
    need for regulatory approvals, including antitrust approvals.
    Acquisitions completed by the Company may be made at substantial premiums
    over the fair value of the net assets of the acquired companies. There
    can be no assurance that the Company will be able to complete future
    acquisitions or that the Company will be able to successfully integrate
    any acquired businesses into its existing businesses or make such
    businesses profitable.

        Dependence on Semiconductor Industry. A significant portion of the
    Company's total revenues is attributable to the sale of products and
    related services to customers in the semiconductor industry. Demand for
    the Company's products and services within the semiconductor industry is
    dependent upon the level of capital spending by semiconductor companies.
                                        33PAGE
<PAGE>
    ThermoSpectra Corporation                       1997 Financial Statements

                           Forward-looking Statements

    There can be no assurance that current levels of semiconductor activities
    will be maintained or that demand for the Company's products and related
    services will reflect the level of such activities. Decreases in
    semiconductor activities could have a significant adverse effect upon the
    demand for the Company's products and related services, which would
    materially adversely affect the Company's business, financial position,
    and results of operations.

        Possible Adverse Impact of Significant International Operations. The
    Company expects that international sales will continue to represent a
    significant portion of its revenues. In fiscal 1997, international sales
    accounted for approximately half of the Company's total revenues. These
    sales carry a number of inherent risks, including risks associated with
    currency exchange, tariffs and other potential trade barriers,
    potentially reduced protection for intellectual property, the impact of
    recessionary environments in economies outside the United States, and
    generally longer receivable collection patterns. In addition, exports
    from the Company's U.S. and foreign subsidiaries to the Far East
    represented 15% of total revenues in 1997. Exports to Japan represented
    8% of total revenues and exports to Taiwan, South Korea, and Singapore,
    collectively, represented 5% of total revenues. Asia is experiencing a
    severe economic crisis, which has been characterized by sharply reduced
    economic activity and liquidity, highly volatile foreign-currency-
    exchange and interest rates, and unstable stock markets. There can be no
    assurance that the Company's export sales to Asia will not be adversely
    affected by the unstable economic conditions there. Additionally, certain
    of the Company's customers located outside of the Asian region could be
    adversely affected by the unstable economic conditions there.

        Risks Associated with Protection, Defense, and Use of Intellectual
    Property. The Company holds many patents relating to various aspects of
    its products, and believes that proprietary technical know-how is
    critical to many of its products. Proprietary rights relating to the
    Company's products are protected from unauthorized use by third parties
    only to the extent that they are covered by valid and enforceable patents
    or are maintained in confidence as trade secrets. There can be no
    assurance that patents will issue from any pending or future patent
    applications owned by or licensed to the Company or that the claims
    allowed under any issued patents will be sufficiently broad to protect
    the Company's technology and, in the absence of patent protection, the
    Company may be vulnerable to competitors who attempt to copy the
    Company's products or gain access to its trade secrets and know-how.
    Proceedings initiated by the Company to protect its proprietary rights
    could result in substantial costs to the Company. There can be no
    assurance that competitors of the Company will not initiate litigation to
    challenge the validity of the Company's patents, or that they will not
    use their resources to design comparable products that do not infringe
    the Company's patents. There may also be pending or issued patents held
    by parties not affiliated with the Company that relate to the Company's
    products or technologies. The Company's PSI subsidiary has received an
    allegation of patent infringement from a competitor relating to its
    scanning probe microscopy technology and the Company's NORAN subsidiary
    has received allegations of patent infringement from two competitors
                                        34PAGE
<PAGE>
    ThermoSpectra Corporation                       1997 Financial Statements

                           Forward-looking Statements

    relating to its confocal microscopy technology. The Company may need to
    acquire licenses to, or contest the validity of, these or any other such
    patents. There can be no assurance that any license required under any
    such patent would be made available on acceptable terms or that the
    Company would prevail in any such contest. In addition, if any such
    competitor were successful in enforcing such patents, the Company could
    be subject to damages and enjoined from manufacturing and selling any
    related products. The Company could incur substantial costs in defending
    itself in suits brought against it or in suits in which the Company may
    assert its patent rights against others. If the outcome of any such
    litigation is unfavorable to the Company, the Company's business and
    results of operations could be materially adversely affected. Further,
    the laws of some jurisdictions do not protect the Company's proprietary
    rights to the same extent as the laws of the U.S. and there can be no
    assurance that the available protections will be adequate. In addition,
    the Company relies on trade secrets and proprietary know-how which it
    seeks to protect, in part, by confidentiality agreements with its
    collaborators, employees, and consultants. There can be no assurance that
    these agreements will not be breached, that the Company would have
    adequate remedies for any breach or that the Company's trade secrets will
    not otherwise become known or be independently developed by competitors.

        Inability to Raise Future Capital; Possible Dilution. In order to
    finance the acquisitions that are part of the Company's growth strategy,
    it may be necessary for the Company to raise additional funds either
    through public or private financings. Any equity or debt financing, if
    available at all, may be on terms that are not favorable to the Company
    and, in the case of an equity financing, could result in dilution to the
    Company's stockholders.

        Potential Impact of Year 2000 on Processing of Date-sensitive
    Information. The Company is currently assessing the potential impact of
    the year 2000 on the processing of date-sensitive information by the
    Company's computerized information systems and on products sold as well
    as products purchased by the Company. The Company believes that its
    internal information systems and current products are either year 2000
    compliant or will be so prior to the year 2000 without incurring material
    costs. There can be no assurance, however, that the Company will not
    experience unexpected costs and delays in achieving year 2000 compliance
    for its internal information systems and current products, which could
    result in a material adverse effect on the Company's future results of
    operations.
        The Company is presently assessing the potential impact of the year
    2000 on its previously sold products. The Company is also assessing
    whether its key suppliers are adequately addressing this issue and the
    effect this might have on the Company. The Company has not completed its
    analysis and is unable to conclude at this time that the year 2000
    problem as it relates to its previously sold products and products
    purchased from key suppliers is not reasonably likely to have a material
    adverse effect on the Company's future results of operations.

                                        35PAGE
<PAGE>
    ThermoSpectra Corporation                       1997 Financial Statements

                         Selected Financial Information

    (In thousands except
    per share amounts)         1997(a)   1996(b)   1995(c)   1994(d)   1993
    -----------------------------------------------------------------------
    Statement of Income
      Data:
    Revenues               $198,900  $123,199  $ 91,714  $ 42,142  $ 17,702
    Net income                5,848     6,617     4,594     2,368       253
    Earnings per share:                                                    
      Basic                     .40       .53       .41       .25       .03
      Diluted                   .39       .53       .40       .25       .03

    Balance Sheet Data:
    Working capital        $ 53,540  $ 44,683  $ 35,961  $ 27,377  $  6,037
    Total assets            253,397   152,485   122,917    78,701    18,795
    Long-term obligations    67,300    22,300     7,300     7,300         -
    Shareholders'
      investment            128,338    89,621    82,525    53,313    14,494

    (a)Reflects the March 1997 acquisition by Thermo Instrument of NESLAB
       and the March 1997 acquisition by the Company of PSI.
    (b)Reflects the March 1996 acquisition by Thermo Instrument of the Kevex
       businesses.
    (c)Reflects the May 1995 acquisition of GIS and the net proceeds of the
       Company's initial public offering and private placement of common
       stock.
    (d)Reflects the March 1994 acquisition by Thermo Instrument of NORAN
       Instruments Inc., the September 1994 acquisition by the Company of
       IRT Corporation, and the net proceeds of the Company's private
       placements of common stock.











                                        36PAGE
<PAGE>
    ThermoSpectra Corporation                       1997 Financial Statements


    Common Stock Market Information
        The Company's common stock is traded on the American Stock Exchange
    under the symbol THS. The following table sets forth the high and low
    sales prices of the Company's common stock for 1997 and 1996, as reported
    in the consolidated transaction reporting system.
                                                                             
                                         1997                    1996
                                 -------------------       ----------------
    Quarter                         High        Low          High       Low
    -----------------------------------------------------------------------

    First                        $15 1/8    $11 3/4       $18 7/8   $14 5/8
    Second                        14 1/2     11 3/8        18 7/8    15 1/4
    Third                         13 5/8      9 3/4        16 1/8    12 1/2
    Fourth                        13 5/8      9            15 7/8    11 3/8

        As of January 30, 1998, the Company had 260 holders of record of its
    common stock. This does not include holdings in street or nominee names.
    The closing market price on the American Stock Exchange for the Company's
    common stock on January 30, 1998, was $9 1/2 per share.

    Shareholder Services
        Shareholders of ThermoSpectra Corporation who desire information
    about the Company are invited to contact John N. Hatsopoulos, Chief
    Financial Officer, ThermoSpectra Corporation, 81 Wyman Street, P.O. Box
    9046, Waltham, Massachusetts 02254-9046, (781) 622-1111. A mailing list
    is maintained to enable shareholders whose stock is held in street name,
    and other interested individuals, to receive quarterly reports, annual
    reports, and press releases as quickly as possible. Distribution of
    printed quarterly reports is limited to the second quarter only. All
    material will be available from Thermo Electron's Internet site
    (http://www.thermo.com/subsid/ths1.html).

    Stock Transfer Agent
        American Stock Transfer & Trust Company is the stock transfer agent
    and maintains shareholder activity records. The agent will respond to
    questions on issuance of stock certificates, change of ownership, lost
    stock certificates, and change of address. For these and similar matters,
    please direct inquiries to:

        American Stock Transfer & Trust Company
        Shareholder Services Department
        40 Wall Street, 46th Floor
        New York, New York 10005
        (718) 921-8200

    Dividend Policy
        The Company has never paid cash dividends and does not expect to pay
    cash dividends in the foreseeable future because its policy has been to
    use earnings to finance expansion and growth. Payment of dividends will
    rest within the discretion of the Board of Directors and will depend
    upon, among other factors, the Company's earnings, capital requirements,
    and financial condition.

                                        37PAGE
<PAGE>
    ThermoSpectra Corporation                       1997 Financial Statements


    Form 10-K Report
        A copy of the Annual Report on Form 10-K for the fiscal year ended
    January 3, 1998, as filed with the Securities and Exchange Commission,
    may be obtained at no charge by writing to John N. Hatsopoulos, Chief
    Financial Officer, ThermoSpectra Corporation, 81 Wyman Street, P.O. Box
    9046, Waltham, Massachusetts 02254-9046.

    Annual Meeting
        The annual meeting of shareholders will be held on Monday, June 1,
    1998, at 10:45 a.m. at the Hyatt Regency Hotel, Scottsdale, Arizona.








                                        38<PAGE>



                                                                    Exhibit 21

                            THERMOSPECTRA CORPORATION

                         Subsidiaries of the Registrant


       At February 20, 1998, the Registrant owned the following companies:

                                                State or         Registrant's
                                              Jurisdiction           % of
   Name                                     of Incorporation       Ownership
   ------------------------------------     ----------------     ------------

   Diametrix Detectors, Inc.                   Delaware                50
   Gould Instrument Systems, Inc.                Ohio                 100
   Kevex Instruments Inc.                      Delaware               100
   Kevex X-Ray Inc.                            Delaware               100
   NesLab Instruments Europa BV             The Netherlands           100
   NesLab Instruments, Inc.                  New Hampshire            100
   NesLab Instruments Limited                   England               100
   Nicolet Instrument Technologies Inc.        Wisconsin              100
   NORAN Instruments Inc.                      Wisconsin              100
   Park Scientific Instruments Corporation    California              100
     Park Scientific S.A.                     Switzerland             100
     PSI Virgin Islands Incorporated      U.S. Virgin Islands         100
   Sierra Research and Technology, Inc.        Delaware               100
   ThermoSpectra B.V.                       The Netherlands           100
     Nicolet Technologies B.V.              The Netherlands           100
       Bakker Electronics Limited           United Kingdom            100
     NORAN Instruments B.V.                 The Netherlands           100
   ThermoSpectra GmbH                           Germany               100
     Gould Nicolet Messtechnik GmbH             Germany               100
       NORAN Instruments GmbH                   Germany               100
   ThermoSpectra Limited                    United Kingdom            100
     Nicolet Technologies Ltd.              United Kingdom            100
   ThermoSpectra S.A.                           France                100
     Nicolet Technologies S.A.R.L.              France                100 


                                                                   Exhibit 23

                    Consent of Independent Public Accountants
                    -----------------------------------------


        As independent public accountants, we hereby consent to the
    incorporation by reference of our reports dated February 17, 1998,  
    included in or incorporated by reference into ThermoSpectra Corporation's
    Annual Report on Form 10-K for the year ended January 3, 1998, into the
    Company's previously filed Registration Statements as follows:
    Registration Statement No. 33-99110 on Form S-3, Registration Statement
    No. 33-80759 on Form S-8, and Registration Statement No. 333-24649 on
    Form S-8.



                                                  Arthur Andersen LLP



    Boston, Massachusetts
    March 17, 1998


<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM
THERMOSPECTRA CORPORATION'S ANNUAL REPORT ON FORM 10-K FOR THE YEAR ENDED
JANUARY 3, 1998 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL
STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          JAN-03-1998
<PERIOD-END>                               JAN-03-1998
<CASH>                                          20,672
<SECURITIES>                                     2,083
<RECEIVABLES>                                   44,949
<ALLOWANCES>                                     1,934
<INVENTORY>                                     34,785
<CURRENT-ASSETS>                               109,666
<PP&E>                                          31,108
<DEPRECIATION>                                  10,717
<TOTAL-ASSETS>                                 253,397
<CURRENT-LIABILITIES>                           56,126
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                                0
                                          0
<COMMON>                                           153
<OTHER-SE>                                     128,185
<TOTAL-LIABILITY-AND-EQUITY>                   253,397
<SALES>                                        198,900
<TOTAL-REVENUES>                               198,900
<CGS>                                          115,747
<TOTAL-COSTS>                                  115,747
<OTHER-EXPENSES>                                16,046
<LOSS-PROVISION>                                   521
<INTEREST-EXPENSE>                               4,217
<INCOME-PRETAX>                                 10,400
<INCOME-TAX>                                     4,552
<INCOME-CONTINUING>                              5,848
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     5,848
<EPS-PRIMARY>                                      .40
<EPS-DILUTED>                                      .39
        


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM
THERMOSPECTRA CORPORATION'S QUARTERLY REPORT ON FORM 10-Q FOR THE QUARTER ENDED
MARCH 30, 1996 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL
STATEMENTS.
</LEGEND>
<RESTATED> 
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          DEC-28-1996
<PERIOD-END>                               MAR-30-1996
<CASH>                                          21,474
<SECURITIES>                                         0
<RECEIVABLES>                                   24,425
<ALLOWANCES>                                     1,108
<INVENTORY>                                     16,390
<CURRENT-ASSETS>                                66,606
<PP&E>                                          20,356
<DEPRECIATION>                                   4,777
<TOTAL-ASSETS>                                 122,811
<CURRENT-LIABILITIES>                           30,211
<BONDS>                                              0
                                0
                                          0
<COMMON>                                           124
<OTHER-SE>                                      83,669
<TOTAL-LIABILITY-AND-EQUITY>                   122,811
<SALES>                                         26,927
<TOTAL-REVENUES>                                26,927
<CGS>                                           14,139
<TOTAL-COSTS>                                   14,139
<OTHER-EXPENSES>                                 2,756
<LOSS-PROVISION>                                    36
<INTEREST-EXPENSE>                                 107
<INCOME-PRETAX>                                  2,377
<INCOME-TAX>                                       941
<INCOME-CONTINUING>                              1,436
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     1,436
<EPS-PRIMARY>                                      .12
<EPS-DILUTED>                                      .11
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM
THERMOSPECTRA CORPORATION'S QUARTERLY REPORT ON FORM 10-Q FOR THE QUARTER ENDED
SEPTEMBER 28, 1996 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH
FINANCIAL STATEMENTS.
</LEGEND>
<RESTATED> 
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          DEC-28-1996
<PERIOD-END>                               SEP-28-1996
<CASH>                                          14,501
<SECURITIES>                                     3,038
<RECEIVABLES>                                   28,481
<ALLOWANCES>                                     1,555
<INVENTORY>                                     24,592
<CURRENT-ASSETS>                                75,282
<PP&E>                                          26,792
<DEPRECIATION>                                   6,320
<TOTAL-ASSETS>                                 145,908
<CURRENT-LIABILITIES>                           34,953
<BONDS>                                              0
                                0
                                          0
<COMMON>                                           124
<OTHER-SE>                                      87,009
<TOTAL-LIABILITY-AND-EQUITY>                   145,908
<SALES>                                         88,537
<TOTAL-REVENUES>                                88,537
<CGS>                                           45,577
<TOTAL-COSTS>                                   45,577
<OTHER-EXPENSES>                                 9,190
<LOSS-PROVISION>                                   182
<INTEREST-EXPENSE>                                 448
<INCOME-PRETAX>                                  7,790
<INCOME-TAX>                                     3,102
<INCOME-CONTINUING>                              4,688
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     4,688
<EPS-PRIMARY>                                      .38
<EPS-DILUTED>                                      .37
        

</TABLE>


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