THERMO INSTRUMENT SYSTEMS INC
10-K, 1997-03-19
MEASURING & CONTROLLING DEVICES, NEC
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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 December 28, 1996

   [   ] Transition Report Pursuant to Section 13 or 15(d) of the Securities
         Exchange Act of 1934

                          Commission file number 1-9786

                         THERMO INSTRUMENT SYSTEMS INC.
             (Exact name of Registrant as specified in its charter)
   Delaware                                                        04-2925809 
   (State or other jurisdiction of                           (I.R.S. Employer 
   incorporation or organization)                          Identification No.)

   1275 Hammerwood Avenue
   Sunnyvale, California                                                94089 
   (Address of principal executive offices)                         (Zip Code)
       Registrant's telephone number, including area code: (617) 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, $.10 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 24, 1997, was approximately $597,117,000.

   As of January 24, 1997, the Registrant had 96,931,388 shares of Common
   Stock outstanding.

                       Documents Incorporated by Reference

   Portions of the Registrant's Annual Report to Shareholders for the year
   ended December 28, 1996, 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 2, 1997, are incorporated by
   reference into Part III.
PAGE
<PAGE>
                                    PART I


   Item 1.  Business

   (a)  General Development of Business.

        Thermo Instrument Systems Inc. (the Company or the Registrant) is a
   worldwide leader in the development, manufacture, and marketing of
   analytical instruments used to identify complex chemical compounds, toxic
   metals, and other elements in a broad range of liquids and solids, as
   well as instruments used to monitor radioactivity and air pollution, and
   to control, image, inspect, and measure various industrial processes and
   life sciences phenomena. Through its 72%-owned ThermoSpectra Corporation
   (ThermoSpectra) subsidiary, the Company develops, manufactures, and
   markets precision imaging, inspection, and measurement instrumentation
   that employ a variety of energy sources or signals as well as high-speed
   data acquisition and digital processing technologies. The Company's
   93%-owned ThermoQuest Corporation (ThermoQuest) subsidiary develops,
   manufactures, and sells mass spectrometers, liquid chromatographs, and
   gas chromatographs for the pharmaceutical, environmental, and industrial
   marketplaces. These analytical instruments are used in the quantitative
   and qualitative chemical analysis of organic and inorganic compounds at
   ultra-trace levels of detection. Through its 93%-owned Thermo Optek
   Corporation (Thermo Optek) subsidiary, the Company develops,
   manufactures, and markets optical and energy-based analytical instruments
   and has key technologies in electro-optic components and systems. Thermo
   Optek's analytical instruments are used in the quantitative and
   qualitative chemical analysis of elements and molecular compounds in
   solids, liquids, and gases. Through its 67%-owned Thermo BioAnalysis
   Corporation (Thermo BioAnalysis) subsidiary, the Company develops,
   manufactures, and markets instruments and information management systems
   used in biochemical research and production, as well as in clinical
   diagnostics. The Company's 84%-owned Metrika Systems Corporation (Metrika
   Systems) subsidiary develops, manufactures, and markets on-line
   industrial process optimization systems that employ proprietary,
   ultra-high-speed measurement technologies. Through its wholly owned
   subsidiaries, the Company also manufactures monitoring instruments to
   detect and measure nuclear radiation and air pollutants, including toxic
   and combustible gases and participates in the process monitoring,
   analysis, gauging, and control instruments markets, primarily for the
   oil, gas, and petrochemical industries.

        The Company has adopted a strategy of spinning out certain of its
   businesses into separate subsidiaries and having these subsidiaries sell
   a minority interest to outside investors. The Company believes that this
   strategy provides additional motivation and incentives for the management
   of the subsidiaries through the establishment of subsidiary-level stock
   option incentive programs, as well as capital to support the

                                        2PAGE
<PAGE>
   subsidiaries' growth. During 19961, ThermoQuest, Thermo Optek, and Thermo
   BioAnalysis sold shares of their common stock in initial public offerings
   and Metrika Systems sold shares of its common stock in a private
   placement for aggregate net proceeds of $125.0 million. See Note 11 to
   Consolidated Financial Statements in the Registrant's 1996 Annual Report
   to Shareholders for a description of the issuance of stock by the
   Company's subsidiaries.

        In September 1996, Thermo Optek announced its intent to spin out its
   Thermo Vision Corporation (Thermo Vision) subsidiary through a
   distribution of all of Thermo Vision's outstanding capital stock in the
   form of a dividend to Thermo Optek shareholders. The Company anticipates
   completing the spinout in 1997 and is seeking a Letter Ruling from the
   Internal Revenue Service stating that the proposed spinout will have no
   current tax effect on Thermo Optek or its shareholders. Thermo Optek
   would distribute the shares upon receipt of the Letter Ruling and
   satisfaction of other conditions, including the listing of the Thermo
   Vision shares on the American Stock Exchange. Upon completion of this
   proposed transaction, Thermo Vision would be a majority-owned subsidiary
   of the Company.

        The Company historically has expanded both through the acquisition
   of companies and product lines and through internal development of new
   products and technologies. During the past several years, the Company has
   completed a number of complementary acquisitions that have provided
   additional technologies, specialized manufacturing or product development
   expertise, and broader capabilities in marketing and distribution. In
   1996, the Company's acquisitions included Oriel Corporation for $11.8
   million in cash and the assumption of $0.7 million in debt; Corion
   Corporation for $5.1 million in cash; the DYNEX Technologies (formerly
   Dynatech Laboratories Worldwide) division of Dynatech Corporation for
   $43.2 million in cash; and a substantial portion of the businesses
   comprising the Scientific Instruments Division of Fisons plc (Fisons), a
   wholly owned subsidiary of Rhone-Poulenc Rorer Inc., for approximately
   123.5 million British pounds sterling in cash (approximately $188.9
   million) and the assumption of approximately 30.8 million British pounds
   sterling of indebtedness (approximately $47.2 million). The purchase
   price for the Fisons businesses is subject to post-closing adjustments
   equal to the amounts by which the net tangible assets and net debt of the
   acquired businesses on the closing date are greater or less than certain
   target amounts agreed to by the parties. On March 12, 1997, the Company
   declared unconditional in all respects its cash tender offer for all
   outstanding shares of Life Sciences International PLC (Life Sciences) for
   135 British pence per share (approximately $2.16 per share). As of that
   date, the Company had received acceptances representing approximately 91%
   of the Life Sciences shares outstanding and the Company owned an
   additional 3% of the outstanding Life Sciences shares. There are
   approximately 175 million Life Sciences shares outstanding. The Company
   has established March 26, 1997, as the date for payment for all shares to
   which acceptance had been received. In addition, the Company expects to
   repay approximately $72 million of Life Sciences' debt, net of acquired


   1 References to 1996, 1995, and 1994 herein are for the fiscal years
     ended December 28, 1996, December 30, 1995, and December 31, 1994,
     respectively.
                                        3PAGE
<PAGE>
   cash expected to be used. Life Sciences, a London Stock Exchange-listed
   company, manufactures laboratory science equipment, appliances,
   instruments, consumables, and reagents for the research, clinical, and
   industrial markets.

        The Company was incorporated in Delaware in May 1986 as a wholly
   owned subsidiary of Thermo Electron Corporation (Thermo Electron) to
   succeed the instruments businesses that were previously conducted by
   several Thermo Electron subsidiaries. As of December 28, 1996, Thermo
   Electron owned 79,207,044 shares, or 82%, of the Company's outstanding
   common stock. Thermo Electron is a world leader in environmental
   monitoring and analysis instruments, biomedical products such as
   heart-assist devices and mammography systems, paper-recycling and
   papermaking equipment, biomass electric power generation, and other
   specialized products and technologies. Thermo Electron also provides a
   range of services related to environmental quality.

        Thermo Electron intends for the foreseeable future to maintain at
   least 80% ownership of the Company, so that it may continue to file
   consolidated U.S. federal and certain state income tax returns with the
   Company. This may require the purchase by Thermo Electron of additional
   shares of common stock and/or convertible debentures of the Company from
   time to time as the number of outstanding shares of the Company
   increases. These and any other purchases may be made either in the open
   market or directly from the Company or pursuant to conversions of the
   Company's 3 3/4% senior convertible note due 2000 held by Thermo
   Electron. See Notes 5 and 7 to Consolidated Financial Statements in the
   Registrant's 1996 Annual Report to Shareholders for a description of the
   Company's outstanding stock options and convertible obligations. During
   1996, Thermo Electron purchased 753,750 shares of the Company's common
   stock in the open market at a total cost of $24.6 million.

   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 caption "Forward-looking
   Statements" in the Registrant's 1996 Annual Report to Shareholders
   incorporated herein by reference.

   (b)  Financial Information About Industry Segments.

        The Company operates in one business segment: the developing,
   manufacturing, and marketing of analytical instruments used to identify  
   complex chemical compounds, toxic metals, and other elements in a broad
   range of liquids and solids, as well as instruments used to monitor
   radioactivity and air pollution, and to control, image, inspect, and
   measure various industrial processes and life sciences phenomena.

                                        4PAGE
<PAGE>
   (c)  Description of Business.

        Principal Products and Services

        The Company manufactures and markets instruments that employ a
   variety of advanced analytical techniques to determine the composition,
   structure, and physical properties of natural and synthetic substances.
   The Company's instruments are used for analysis; test and measurement;
   environmental and nuclear monitoring; process control; and in life
   sciences applications. Revenues from analytical and test and measurement
   instruments were $772.0 million, $537.5 million, and $429.8 million in
   1996, 1995, and 1994, respectively.

        ThermoSpectra develops, manufactures, and markets precision imaging,
   inspection, and measurement instrumentation based on high-speed data
   acquisition and digital processing technologies to provide industrial and
   research customers with integrated systems that address their specific
   needs. ThermoSpectra's products include digital oscillographic recorders
   and data acquisition systems that continuously measure and monitor
   signals from various sensors; digital storage oscilloscopes (DSOs) that
   are capable of taking hundreds of millions of measurements per second of
   transient signals or short bursts of data; X-ray microanalyzers used as
   accessories to electron microscopes to provide elemental materials
   analysis as a supplement to the microscopes' imaging capabilities; X-ray
   fluorescence instruments used for bulk and selected area sample analysis
   in the semiconductor and electronics industries; nondestructive X-ray
   inspection systems for process monitoring and quality control
   applications; and confocal laser scanning microscopes that use laser
   light to generate precise optical images primarily for life science
   applications. ThermoSpectra recently added a line of scanning probe
   microscopes that are used in industry and academia to test and measure
   the topography and other surface properties of materials, down to the
   atomic level.

        ThermoQuest manufactures commercial mass spectrometers and has
   pioneered many of the significant developments and applications of mass
   spectrometry. ThermoQuest's mass spectrometry products identify and
   measure the components of a sample for organic chemical compounds or for
   inorganic compounds. These instruments are used primarily by
   pharmaceutical companies for drug research, testing, and quality control;
   by environmental laboratories for testing water, air, and soil samples
   for compliance with environmental regulations; by chemical companies for
   research and quality control; by manufacturers for testing in certain
   industrial applications, such as the manufacture of silicon chips, and
   for quality control; by food and beverage companies for quality control
   and to test for product contamination; and in forensic applications.
   ThermoQuest provides both stand-alone mass spectrometers and combined
   systems that use its own chromatographs or those purchased from other
   companies. These products span a range of sensitivity, specificity,
   separation technologies, data-handling capabilities, sizes, and prices.

        ThermoQuest also manufactures high performance liquid
   chromatographs, gas chromatographs, and related instruments and equipment
   used principally in the research and development and production analysis
   of pharmaceuticals and chemicals, and for environmental analysis. These

                                        5PAGE
<PAGE>
   instruments separate the chemical components of substances for purposes
   of identification and measurement and are frequently used in
   environmental and industrial laboratories as stand-alone instruments or
   in conjunction with mass spectrometers, where the gas or liquid
   chromatograph separates a sample into individual chemical components for
   the mass spectrometer to identify.

        Thermo Optek develops, manufactures, and markets analytical
   instruments that utilize a range of optical spectroscopy and energy-based
   techniques. These instruments are used in the quantitative and
   qualitative chemical analysis of elements and molecular compounds in a
   wide variety of solids, liquids, and gases and are based on several
   optical spectroscopy techniques, including atomic emission (AE), atomic
   absorption (AA), Fourier transform infrared (FT-IR) and FT-Raman, and
   ultraviolet/visible (UV/Vis) technologies. AA and AE spectrometers are
   used to detect and measure metals and other elements in solid and liquid
   samples from ultratrace (parts per billion) to major concentrations based
   on the atomic spectra that a sample emits or absorbs when it is excited
   by an energy source. FT-IR and FT-Raman spectrometers are used to
   determine the molecular composition of samples by observing how they
   absorb or emit infrared light. UV/Vis spectrometry instruments are based
   upon the selective absorbence of ultraviolet radiation by various
   substances. Thermo Optek also offers a line of wavelength dispersive
   X-ray fluorescence instruments that provide elemental analysis of a wide
   variety of materials in a highly precise and generally nondestructive
   manner. Thermo Optek's products are used by its customers for
   productivity enhancement, research and development, quality control, and
   testing applications in the environmental testing, chemical,
   metallurgical, food and beverage, pharmaceutical, and petroleum
   industries; and by forensic laboratories, research organizations, and
   educational institutions. Through its Thermo Vision subsidiary, Thermo
   Optek addresses the photonics marketplace for optical components, imaging
   systems, analytical instruments, and lasers. Thermo Vision is pursuing
   applications of its photonics technologies for cost-effective,
   application-specific instruments and for optical components, systems, and
   subassemblies for analytical instrumentation.

        Thermo BioAnalysis develops, manufactures, and markets instruments
   and information management systems used in biochemical research and
   production, as well as in clinical diagnostics. The Company focuses on
   three principal product areas: life sciences instrumentation, laboratory
   information management systems, and health physics instrumentation. The
   Company's life sciences instrumentation products include instruments and
   consumables based on proprietary immunoassay, optical biosensor, mass
   spectrometry, and capillary electrophoresis (CE) technologies. The
   Company's laboratory information management systems (LIMS) and
   chromatography data systems (CDS) are used in laboratories and clinical
   testing facilities. These systems are designed to facilitate the
   monitoring and analysis of samples throughout the laboratory or clinical
   lifecycle. The Company's health physics instrumentation includes
   radiation detection instrumentation and complete radiation monitoring
   systems for use in and around nuclear power plants and other facilities
   where radioactive materials are used.

                                        6PAGE
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        The Company's majority-owned, privately held Metrika Systems
   subsidiary manufactures equipment that provides on-line, real-time
   analysis of the elemental composition of bulk raw materials, such as coal
   and cement, in the basic materials production process. In addition,
   Metrika Systems manufactures industrial gauging and process control
   instruments and systems for measuring thickness and coating used
   principally by manufacturers of web-type materials, such as metal strip,
   rubber, and plastic foils.

        In other wholly owned businesses, the Company manufactures
   monitoring instruments for three principal markets: the detection and
   measurement of nuclear radiation; the monitoring of air pollutants,
   including toxic and combustible gases; and process monitoring, analysis,
   and control.

        The Company's nuclear radiation monitoring instruments detect and
   measure alpha, beta, gamma, neutron, and X-ray radiation emitted by
   natural sources and by radioactive materials used in nuclear power plants
   and certain governmental, industrial, and medical facilities. The Company
   is a leading manufacturer of a broad range of stand-alone and portable
   instruments and computer-integrated instrument systems used to ensure the
   safety of personnel from exposure to nuclear radiation. In addition, the
   Company is a major supplier of instruments and systems that are
   manufactured to European standards for personnel protection and
   environmental monitoring.

        The Company's air-monitoring instruments measure pollutants in
   ambient air and from stationary sources such as industrial smokestacks.
   The principal pollutants measured are oxides of nitrogen, sulfur dioxide,
   carbon monoxide, ozone, volatile organic compounds (VOCs), and airborne
   particulates. These instruments are used by utility and industrial
   customers to ensure compliance with environmental regulations; by
   government agencies to monitor air quality; and by research facilities.
   The Occupational Safety and Health Administration's safety requirements
   for protecting workers from toxic or explosive atmospheres in confined
   spaces are addressed with the Company's detectors, instruments, and
   systems for sensing, monitoring, and warning of such dangers. These
   worker-safety products are used in a wide range of applications, from
   large petrochemical plants, utilities, and industrial manufacturing
   facilities to commercial buildings.

        The Company also participates in the process monitoring, analysis,
   gauging, and control instruments markets, primarily for the oil, gas, and
   petrochemical industries. The Company manufactures and markets a number
   of process monitoring, analysis, and control systems including: analog
   and digital recorders for continuous process industries; process and
   laboratory analytical instruments and monitors to detect lethal gases for
   the oil, gas, and petrochemical industries; supervisory control and data
   acquisition software for process monitoring and operator interface in a
   variety of industrial processes; and turnkey, integrated systems to
   control networks of distant oil and gas wells.

        The Company also manufactures and markets process gauges and
   noncontacting and nonintrusive process control instrumentation to measure
   liquid levels, density, weight, and flows for a variety of industries.

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   The Company's X-ray fluorescence instruments allow for the nondestructive
   analysis of inorganic elements.

        With the acquisition of Life Sciences, the Company manufactures
   laboratory science equipment, appliances, instruments, consumables, and
   reagents for the research, clinical, and industrial markets. These
   operations are organized into four product groups including: laboratory
   products, serving the global research laboratory market; clinical
   products, serving the hospital and clinical laboratory markets;
   biosystems, serving the biotech and molecular biology R&D and QC labs;
   and industrial products, serving semiconductor manufacturers and other
   industries with water baths and chillers. The Company believes that this
   acquisition will extend its product offerings into new markets, such as
   clinical laboratory equipment, as well as enhance its presence in the
   bioanalytical instrumentation marketplace.

        Backlog

        The Company's backlog of firm orders was $266.6 million as of
   December 28, 1996, and $188.7 million as of December 30, 1995. The
   Company anticipates that substantially all of the backlog as of December
   28, 1996, will be shipped or completed during 1997. The Company does not
   believe that the level of, or changes in the level of, its backlog is
   necessarily indicative of intermediate or long-term trends in its
   business.

        Competition

        The Company generally competes on the basis of technical advances
   that result in new products and improved price/performance ratios,
   reputation among customers as a quality leader for products and services,
   and active research and application-development programs. To a lesser
   extent, the Company competes on the basis of price.

        In many markets, the Company competes with large analytical
   instrument companies such as Hewlett-Packard Co. (Hewlett-Packard),
   Perkin-Elmer Corp. (Perkin-Elmer), Varian Associates, Inc. (Varian), and
   Hitachi, Ltd. (Hitachi). Certain products manufactured by the Company
   also compete with products sold by numerous smaller, specialized firms.

        ThermoSpectra competes in each of its markets 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, ThermoSpectra
   competes on the basis of price. The market for digital oscillographic
   recorders is characterized by competition among a number of competitors,
   including Astro-Med, Inc. and Yokogawa Corporation (Yokogawa). The
   general purpose DSO market is dominated by Tektronix, Inc. and
   Hewlett-Packard. The Company competes primarily in the high- and mid-ends
   of the X-ray microanalysis market. In the high end of this market,
   ThermoSpectra offers superior imaging and user-interface software.
   ThermoSpectra competes in the mid end of the X-ray microanalysis market
   on the basis of quality, performance, and price. The main competitor in
   this segment is Link Analytical Limited, a wholly owned subsidiary of
   Oxford Instruments plc (Oxford). In the X-ray inspection market,

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   ThermoSpectra competes with smaller companies in the manual segment of
   the market, and primarily with Four Pi Systems, a subsidiary of
   Hewlett-Packard, in the automated segment. In the digital video segment
   of the confocal microscopy market, ThermoSpectra competes primarily with
   Nikon Inc. as well as Bio-Rad Laboratories, Inc. (Bio-Rad). The Company
   competes in the scanning probe microscope market on the basis of quality
   and, to a lesser extent, price. The dominant competitor in this market is
   Digital Instruments, Inc.

        ThermoQuest competes in each of its markets primarily on technical
   performance, customer service and support and, to a lesser extent, price.
   ThermoQuest's principal competitors in the mass spectrometry market
   include Hewlett-Packard, Micromass Ltd. (Micromass), Japan Electro
   Optical Laboratories, and the Sciex Division of Perkin-Elmer.
   ThermoQuest's principal competitors in the liquid chromatography market
   are Waters Technologies Corporation, Hewlett-Packard, Shimadzu
   Corporation (Shimadzu), Beckman Instruments, Inc. (Beckman), and
   Perkin-Elmer. In the gas chromatography market, ThermoQuest competes with
   numerous companies, including Hewlett-Packard, Varian, Perkin-Elmer, and
   Shimadzu.

        Thermo Optek competes in each of its markets primarily on the basis
   of performance, reliability, customer service, and price. In the market
   for AE and AA spectrometers and inductively coupled plasma/mass
   spectrometry instruments, Thermo Optek competes primarily with
   Perkin-Elmer and, to a lesser extent, Varian. Thermo Optek competes in
   the arc/spark market primarily with Spectro. In the FT-IR and FT-Raman
   markets, Thermo Optek competes primarily with Perkin-Elmer, the Digilab
   division of Bio-Rad, and Bruker Instruments, Inc. (Bruker). Thermo
   Optek's primary competitors in the UV/Vis instruments market are
   Perkin-Elmer, Shimadzu, and Hewlett-Packard.

        Thermo BioAnalysis competes in each of its markets primarily on the
   basis of technological innovation, cost, performance (including
   throughput and sensitivity), and flexibility. The Company's principal
   competitors in the immunoassay consumables or plastics market include
   Nunc-Nalge Inc., Greiner GmbH, and Corning-Costar Corp. In the detection
   systems market, the Company competes primarily with Bio-Tek Instruments,
   Inc. and Molecular Devices Corp. In the automated systems market, the
   Company's main competitors include BioChem Pharma Inc., Immunosystems,
   Inc., and Hamilton Bonaduz AG. The Company's dominant competitor in the
   market for optical biosensors is the Pharmacia Biosensor subsidiary of
   Pharmacia & Upjohn, Inc. In the matrix-assisted laser
   desorption/time-of-flight (MALDI-TOF) mass spectrometry market, principal
   competitors include PerSeptive Biosystems, Inc., Bruker, and Micromass.
   Thermo BioAnalysis' principal competitors in the CE market include
   Beckman, Bio-Rad, and Hewlett-Packard. Significant competitors in the
   LIMS and CDS markets include Perkin-Elmer, Beckman, and the Laboratory
   MicroSystems Inc. subsidiary of Instron Corp. Significant competitors in
   the health physics instrumentation market include the Instruments Group
   of EG&G, Inc., the Nuclear Products Division of Morgan Crucible Co., plc,
   and the Bicron/NE Technology division of Saint-Gobain-Norton Industrial
   Ceramics Corporation.

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        Metrika Systems competes primarily on the basis of performance and,
   to a lesser extent, price in the coal, cement, and mineral industries.
   Scantech Holdings is the Company's primary competitor in these
   industries. Competition in the thickness gauging business is highly
   fragmented with numerous competitors competing in various end use market
   segments. As a result, competition varies according to the end use
   segment. Metrika Systems competes on the basis of quality, performance,
   and price. Metrika Systems' competitors in this market include Measurex,
   Toshiba, Yokogawa, IMS, and Asea Brown Boveri.

        The Company is a leading manufacturer of ambient air monitoring
   instruments and a major manufacturer of source monitoring and
   worker-safety monitoring instruments. The Company competes in these
   markets on the basis of technical performance and reliability, as well as
   customer service. The Company's principal competitors include Monitor
   Labs Incorporated, Advanced Pollution Instruments, and Mine Safety
   Appliances Co.

        The Company has a relatively small presence within the large and
   varied process control marketplace, which is extremely fragmented and
   comprises several large companies, including Fisher-Rosemount, Elsig
   Bailey, and Honeywell Process Control, as well as numerous smaller
   companies. The Company competes in this market primarily on the basis of
   technical performance, customer service, and reliability.

        Environmental Protection Regulations

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

        Number of Employees

        As of December 28, 1996, the Company employed approximately 6,870
   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 13 to Consolidated Financial
   Statements in the Registrant's 1996 Annual Report to Shareholders and is
   incorporated herein by reference.



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   (e)  Executive Officers of the Registrant.

                                      Present Title (Year First Became
   Name                        Age    Executive Officer)
   -------------------------   ---    --------------------------------
   Arvin H. Smith              67     Chief Executive Officer (1986)
   Earl R. Lewis               53     President and Chief Operating
                                       Officer (1990)
   Denis A. Helm               58     Senior Vice President (1986)
   Dr. Richard W.K. Chapman    52     Vice President (1994)
   Barry S. Howe               41     Vice President (1994)
   John N. Hatsopoulos *       62     Vice President and Chief
                                       Financial Officer (1988)
   Paul F. Kelleher            54     Chief Accounting Officer (1986)

   * John N. Hatsopoulos and George N. Hatsopoulos, a director of the
     Company, are brothers.

        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. All executive officers, except Mr. Lewis
   and Dr. Chapman, have held comparable positions for at least five years
   either with the Company or with its parent company, Thermo Electron. Mr.
   Lewis was named President of the Company in March 1997. Mr. Lewis served
   as Executive Vice President and Chief Operating Officer of the Company
   from January 1996 through March 1997, as a Senior Vice President from
   January 1994 through January 1996, and as a Vice President from March
   1990 through January 1994. Dr. Chapman has been President and Chief
   Executive Officer of ThermoQuest since its inception in June 1995, and
   served as President of Finnigan Corporation (Finnigan), a subsidiary of
   ThermoQuest, from 1992 to 1995 and as Marketing Manager of Finnigan from
   1989 to 1992. Messrs. Lewis, Helm, Chapman, and Howe are full-time
   employees of the Company. Messrs. Smith, Hatsopoulos, and Kelleher are
   full-time employees of Thermo Electron and certain of its subsidiaries,
   but devote such time to the affairs of the Company as the Company's needs
   reasonably require.


   Item 2.  Properties

        The Company owns approximately 1,973,000 square feet of office,
   engineering, laboratory, and production space, principally in California,
   Colorado, Florida, New Mexico, Texas, Wisconsin, Germany, England, and
   Switzerland, and leases approximately 2,281,000 square feet of office,
   engineering, laboratory, and production space under leases expiring from
   1997 through 2017, principally in California, Massachusetts, Connecticut,
   Ohio, Texas, England, France, Germany, and Japan. As of December 28,
   1996, the Company had a $9.3 million mortgage loan that is secured by
   200,000 square feet of property in California with a net book value of
   $16.0 million. The Company believes that its facilities are in good
   condition and are suitable and adequate for its present operations and
   that suitable space is readily available if any of such leases are not
   extended.
                                       11PAGE
<PAGE>
   Item 3.  Legal Proceedings

        Not applicable.


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

        Not applicable.


                                    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, $.10 par value, and dividend policy is
   included under the sections labeled "Common Stock Market Information" and
   "Dividend Policy" in the Registrant's 1996 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 1996 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 1996 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 December
   28, 1996, and Supplementary Data are included in the Registrant's 1996
   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.

                                       12PAGE
<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.

                                       13PAGE
<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 schedule set forth in
                the list below is 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.

            None.

        (c) Exhibits.

            See Exhibit Index on the page immediately preceding exhibits.

                                       14PAGE
<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 19, 1997                    THERMO INSTRUMENT SYSTEMS INC.


                                           By: Arvin H. Smith
                                               ----------------------
                                               Arvin H. Smith
                                               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 19, 1997.

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

   By:Arvin H. Smith                  Chief Executive Officer, Chairman of
      -----------------------          the Board, and Director
      Arvin H. Smith                  

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

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

   By:Frank Borman                    Director
      -----------------------
      Frank Borman

   By:George N. Hatsopoulos           Director
      -----------------------
      George N. Hatsopoulos

   By:Polyvios C. Vintiadis           Director
      -----------------------
      Polyvios C. Vintiadis
PAGE
<PAGE>





                   Report of Independent Public Accountants
                   ----------------------------------------


   To the Shareholders and Board of Directors of
   Thermo Instrument Systems Inc.:

        We have audited, in accordance with generally accepted auditing
   standards, the consolidated financial statements included in Thermo
   Instrument Systems Inc.'s Annual Report to Shareholders incorporated by
   reference in this Form 10-K, and have issued our report thereon dated
   February 11, 1997 (except with respect to the matter discussed in Note 15
   as to which the date is March 12, 1997). 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 14 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 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 11, 1997
PAGE
<PAGE>
SCHEDULE II

                         THERMO INSTRUMENT SYSTEMS INC.

                        Valuation and Qualifying Accounts
                                 (In thousands)
                                     
                         Provision
             Balance at    Charged                Accounts               Balance
              Beginning         to     Accounts    Written                at End
Description     of Year    Expense    Recovered        Off    Other(a)   of Year
- --------------------------------------------------------------------------------
Year Ended
 December 28,
 1996

Allowance for
 Doubtful
 Accounts       $12,569     $2,274       $   69   $(5,015)    $7,084     $16,981

Year Ended
 December 30,
 1995

Allowance for
 Doubtful
 Accounts       $ 8,779     $2,543       $  191   $(2,942)    $3,998     $12,569

Year Ended
 December 31,
 1994

Allowance for
 Doubtful
 Accounts       $ 8,456     $  733       $  126   $(2,736)    $2,200     $ 8,779

(a) Includes allowance of businesses acquired during the year as described in
    Note 4 to Consolidated Financial Statements in the Company's 1996 Annual
    Report to Shareholders, the effect of foreign currency translation, and a
    disposition in 1994 of $2,696,000.







                                       17PAGE
<PAGE>
                                  EXHIBIT INDEX

    Exhibit
    Number       Description of Exhibit
    ----------   -----------------------------------------------------------
      2.1        Asset and Stock Purchase Agreement among the
                 Registrant, Thermo Electron,. and Fisons plc dated
                 March 1, 1995, as amended (filed as Exhibit 2.3 to the
                 Registrant's Annual Report on Form 10-K for the fiscal
                 year ended December 31, 1994, and as Exhibit 2 to the
                 Registrant's Quarterly Report on Form 10-Q for the
                 quarter ended September 30, 1995 [File No. 1-9786] and
                 incorporated herein by reference). Pursuant to Item
                 601(b)(2) of Regulation S-K, schedules to this
                 Agreement have been omitted. The Company hereby
                 undertakes to furnish supplementally a copy of such
                 schedules to the Commission upon request.

      3.1        Amendment to Restated Certificate of Incorporation of
                 the Registrant (filed as Exhibit 3.1 to the
                 Registrant's Quarterly Report on Form 10-Q for the
                 quarter ended June 29, 1996 [File No. 1-9786] and
                 incorporated herein by reference).

      3.2        By-Laws of the Registrant (filed as Exhibit 3(b) to
                 the Registrant's Annual Report on Form 10-K for the
                 fiscal year ended January 2, 1993 [File No. 1-9786]
                 and incorporated herein by reference).

      4.1        Fiscal Agency Agreement dated as of September 15,
                 1993, among the Registrant, Thermo Electron, and
                 Chemical Bank as fiscal agent, relating to $70,000,000
                 principal amount of 3 3/4% senior convertible
                 debentures due 2000 (filed as Exhibit 4 to the
                 Registrant's Quarterly Report on Form 10-Q for the
                 quarter ended October 2, 1993 [File No. 1-9786] and
                 incorporated by reference).

      4.2        Senior convertible note purchase agreement by and
                 between the Registrant and Thermo Electron as of
                 September 15, 1993 (filed as Exhibit 10(a) to the
                 Registrant's Quarterly Report on Form 10-Q for the
                 quarter ended October 2, 1993 [File No. 1-9786] and
                 incorporated by reference).

                 The Registrant hereby agrees, pursuant to Item 601(b)
                 (4) (iii) (A) of Regulation S-K, to furnish to the
                 Commission upon request, a copy of each instrument
                 with respect to other long-term debt of the Registrant
                 or its subsidiaries.

     10.1        Amended and Restated Corporate Services Agreement,
                 dated as of January 3, 1993, between Thermo Electron
                 and the Registrant (filed as Exhibit 10(a) to the
                 Registrant's Annual Report on Form 10-K for the fiscal
                 year ended January 2, 1993 [File No. 1-9786] and
                 incorporated herein by reference).
                                       18PAGE
<PAGE>
                                  EXHIBIT INDEX

    Exhibit
    Number       Description of Exhibit
    ----------   -----------------------------------------------------------
     10.2        Tax Allocation Agreement dated as of May 29, 1986,
                 between Thermo Electron and the Registrant (filed as
                 Exhibit 10(b) to the Registrant's Registration
                 Statement on Form S-1 [Reg. No. 33-6762] and
                 incorporated herein by reference).

     10.3        Thermo Electron Corporate Charter, as amended and
                 restated effective January 3, 1993 (filed as Exhibit
                 10(f) to the Registrant's Annual Report on Form 10-K
                 for the fiscal year ended January 2, 1993 [File No.
                 1-9786] and incorporated herein by reference).

     10.4        Form of Indemnification Agreement with Directors and
                 Officers (filed as Exhibit 10(g) to the Registrant's
                 Annual Report on Form 10-K for the fiscal year ended
                 December 29, 1990 [File No. 1-9786] and incorporated
                 herein by reference).

     10.5        Plan for sale of shares by the Registrant to Thermo
                 Electron (filed as Exhibit 10(dd) to the Registrant's
                 Quarterly Report on Form 10-Q for the quarter ended
                 July 3, 1993 [File No. 1-9786] and incorporated herein
                 by reference).

     10.6        Master Repurchase Agreement dated December 28, 1996,
                 between the Registrant and Thermo Electron.

     10.7        Master Guarantee Reimbursement Agreement dated January
                 1, 1994, by and among the Registrant and Thermo
                 Electron (filed as Exhibit 4.4 to the Registrant's
                 Annual Report on Form 10-K for the fiscal year ended
                 December 31, 1994 [File No. 1-9786] and incorporated
                 herein by reference).

     10.8        $30,000,000 Promissory Note dated as of February 13,
                 1996, issued by Thermo BioAnalysis to Thermo Electron
                 (filed as Exhibit 10.1 to the Registrant's Quarterly
                 Report on Form 10-Q for the quarter ended March 30,
                 1996 [File No. 1-9786] and incorporated herein by
                 reference).

     10.9        $65,000,000 Promissory Note dated as of April 12,
                 1996, issued by the Registrant to Thermo Electron
                 (filed as Exhibit 10.2 to the Registrant's Quarterly
                 Report on Form 10-Q for the quarter ended March 30,
                 1996 [File No. 1-9786] and incorporated herein by
                 reference).

     10.10       Restated Stock Holdings Assistance Plan and Form of
                 Promissory Note.

                                       19PAGE
<PAGE>
                                  EXHIBIT INDEX

    Exhibit
    Number       Description of Exhibit
    ----------   -----------------------------------------------------------
     10.11-10.15 Reserved.

     10.16       Deferred Compensation Plan for Directors of the
                 Registrant (filed as Exhibit 10(f) to the Registrant's
                 Registration Statement on Form S-1 [Reg. No. 33-6762]
                 and incorporated herein by reference).

     10.17       Directors' Stock Option Plan of the Registrant (filed
                 as Exhibit 10.17 to the Registrant's Annual Report on
                 Form 10-K for the fiscal year ended December 31, 1994
                 [File No. 1-9786] and incorporated herein by
                 reference).

     10.18       Incentive Stock Option Plan of the Registrant (filed
                 as Exhibit 10(c) to the Registrant's Registration
                 Statement on Form S-1 [Reg. No. 33-6762] and
                 incorporated herein by reference). (Maximum number of
                 shares issuable in the aggregate under this plan and
                 the Registrant's Nonqualified Stock Option Plan is
                 2,812,500 shares, after adjustment to reflect share
                 increase approved in 1990; 3-for-2 stock splits
                 effected in January 1988, July 1993, and April 1995;
                 and 5-for-4 stock split effected in December 1995).

     10.19       Nonqualified Stock Option Plan of the Registrant
                 (filed as Exhibit 10(d) to the Registrant's
                 Registration Statement on Form S-1 [Reg. No. 33-6762]
                 and incorporated herein by reference). (Maximum number
                 of shares issuable in the aggregate under this plan
                 and the Registrant's Incentive Stock Option Plan is
                 2,812,500 shares, after adjustment to reflect share
                 increase approved in 1990; 3-for-2 stock splits
                 effected in January 1988, July 1993, and April 1995;
                 and 5-for-4 stock split effected in December 1995).

     10.20       Equity Incentive Plan of the Registrant (filed as
                 Appendix A to the Proxy Statement dated April 27,
                 1993, of the Registrant [File No. 1-9786] and
                 incorporated herein by reference). (Maximum number of
                 shares issuable is 4,031,250 shares, after adjustment
                 to reflect share increase approved in December 1993;
                 3-for-2 stock splits effected in July 1993 and April
                 1995; and 5-for-4 stock split effected in December
                 1995).

     10.21       Finnigan Corporation 1979 Long-term Incentive Stock
                 Option Plan (filed as Exhibit 10.21 to the
                 Registrant's Annual Report on Form 10-K for the fiscal
                 year ended December 31, 1994 [File No. 1-9786] and
                 incorporated herein by reference).

                                       20PAGE
<PAGE>
                                  EXHIBIT INDEX

    Exhibit
    Number       Description of Exhibit
    ----------   -----------------------------------------------------------
     10.22       Former Thermo Environmental Corporation Incentive
                 Stock Option Plan (filed as Exhibit 10(d) to Thermo
                 Environmental's Registration Statement on Form S-1
                 [Reg. No. 33-329] and incorporated herein by
                 reference). (Maximum number of shares issuable in the
                 aggregate under this plan and the Former Thermo
                 Environmental Corporation Nonqualified Stock Option
                 Plan is 1,160,156 shares, after adjustment to reflect
                 share increase approved in 1987; 3-for-2 stock splits
                 effected in July 1993 and April 1995; and 5-for-4
                 stock split effected in December 1995).

     10.23       Former Thermo Environmental Corporation Nonqualified
                 Stock Option Plan (filed as Exhibit 10(e) to Thermo
                 Environmental's Registration Statement on Form S-1
                 [Reg. No. 33-329] and incorporated herein by
                 reference). (Maximum number of shares issuable in the
                 aggregate under this plan and the Former Thermo
                 Environmental Corporation Incentive Stock Option Plan
                 is 1,160,156 shares, after adjustment to reflect share
                 increase approved in 1987; 3-for-2 stock splits
                 effected in July 1993 and April 1995; and 5-for-4
                 stock split effected in December 1995).

     10.24       Thermo Instrument Systems Inc. - ThermoSpectra
                 Corporation Nonqualified Stock Option Plan (filed as
                 Exhibit 10.51 to the Registrant's Annual Report on
                 Form 10-K for the fiscal year ended December 31, 1994
                 [File No. 1-9786] and incorporated herein by
                 reference).

     10.25       Thermo Instrument Systems Inc. - ThermoQuest
                 Corporation Nonqualified Stock Option Plan (filed as
                 Exhibit 10.65 to Thermo Cardiosystems' Annual Report
                 on Form 10-K for the fiscal year ended December 30,
                 1995 [File No. 1-10114] and incorporated herein by
                 reference).

     10.26       Thermo Instrument Systems Inc. - Thermo BioAnalysis
                 Corporation Nonqualified Stock Option Plan (filed as
                 Exhibit 10.64 to Thermo Cardiosystems' Annual Report
                 on Form 10-K for the fiscal year ended December 30,
                 1995 [File No. 1-10114] and incorporated herein by
                 reference).

     10.27       Thermo Instrument Systems Inc. - Thermo Optek
                 Corporation Nonqualified Stock Option Plan. 


                                       21PAGE
<PAGE>
                                  EXHIBIT INDEX

    Exhibit
    Number       Description of Exhibit
    ----------   -----------------------------------------------------------
                 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 for services
                 rendered to the Registrant or to such affiliated
                 corporations. Thermo Electron's plans were filed as
                 Exhibits 10.21 through 10.44 to the Annual Report on
                 Form 10-K of Thermo Electron for the year ended
                 December 30, 1995 [File No. 1-8002] and as Exhibit
                 10.19 to the Annual Report on Form 10-K of Trex
                 Medical Corporation for the fiscal year ended
                 September 28, 1996 [File No. 1-11827] and are
                 incorporated herein by reference.

     11          Statement re: Computation of Earnings per Share.

     13          Annual Report to Shareholders for the year ended
                 December 28, 1996 (only those portions incorporated
                 herein by reference).

     21          Subsidiaries of the Registrant.

     23          Consent of Arthur Andersen LLP.

     27          Financial Data Schedule.


                                                            Exhibit 10.6

                AMENDED AND RESTATED MASTER REPURCHASE AGREEMENT


             The Master Repurchase Agreement dated as of July 2, 1996
        between Thermo Electron Corporation, a Delaware corporation
        ("Seller"), and Thermo Instrument Systems Inc., a Delaware
        corporation (the "Buyer"), is hereby amended and restated in its
        entirety as follows on and as of December 28, 1996.

        1.   Applicability

             From time to time Buyer and Seller may enter into
        transactions in which Seller agrees to transfer to Buyer certain
        securities and/or financial instruments ("Securities") against
        the transfer of funds by Buyer, with a simultaneous agreement by
        Buyer to transfer to Seller such Securities on demand, against
        the transfer of funds by Seller.  Each such transaction shall be
        referred to herein as a "Transaction" and shall be governed by
        this Agreement, unless otherwise agreed in writing.

        2.   Definitions

             (a)   "Act of Insolvency", with respect to either party (i)
        the commencement by such party as debtor of any case or
        proceeding under any bankruptcy, insolvency, reorganization,
        liquidation, dissolution or similar law, or such party seeking
        the appointment of a receiver, trustee, custodian or similar
        official for such party or any substantial part of its property;
        or (ii) the commencement of any such case or proceeding against
        such party, or another seeking such an appointment, which (A) is
        consented to or not timely contested by such party, (B) results
        in the entry of an order for relief, such an appointment or the
        entry of an order having a similar effect, or (C) is not
        dismissed within 15 days; or (iii) the making by a party of a
        general assignment for the benefit of creditors; or (iv) the
        admission in writing by a party of such party's inability to pay
        such party's debts as they become due; 

             (b)  "Additional Purchased Securities", Securities provided
        by Seller to Buyer pursuant to Paragraph 4(a) hereof; 

             (c)  "Income", with respect to any Security at any time, any
        principal thereof then payable and all interest, dividends or
        other distributions thereon; 

             (d)  "Market Value", with respect to any Securities as of
        any date, the price for such Securities on such date obtained
        from a generally recognized source agreed to by the parties or
        the most recent closing bid quotation from such a source, plus
        accrued Income to the extent not included therein (other than any
        Income transferred to Seller pursuant to Paragraph 6 hereof) as
        of such date (unless contrary to market practice for such
        Securities);
PAGE
<PAGE>
             (e)  "Other Buyers", third parties that have entered into an
        agreement with Seller that is substantially similar to this
        Agreement; 

             (f)  "Pricing Rate", a rate equal to the Commercial Paper
        Composite rate for 90-day maturities provided by Merrill Lynch,
        Pierce, Fenner & Smith Incorporated (or, if such rate is not
        available, a substantially equivalent rate agreed to by Buyer and
        Seller) plus 25 basis points, which rate shall be adjusted on the
        first business day of each fiscal quarter and shall be in effect
        for the entirety such fiscal quarter;
         
             (g)  "Purchase Price", the price at which Purchased
        Securities are transferred by Seller to Buyer; 

             (h)  "Purchased Securities", the Securities transferred by
        Seller to Buyer in a Transaction hereunder, and any Securities
        substituted therefor in accordance with Paragraph 9 hereof.  The
        term "Purchased Securities" with respect to any Transaction at
        any time also shall include Additional Purchase Securities
        transferred pursuant to Paragraph 4(a) and shall exclude
        Securities returned pursuant to Paragraph 4(b);  

             (i)  "Repurchase Collateral Account", a book account
        maintained by Seller containing, among other Securities, the
        Purchased Securities; and

             (j)  "Repurchase Price", for any Purchased Security, an
        amount equal to the Purchase Price paid by Buyer to Seller for
        such Purchased Security. 

        3.   Transactions

             (a)  A Transaction may be initiated by Buyer upon the
        transfer of the Purchase Price to Seller's account.  Upon such
        transfer, Seller shall transfer to Buyer Purchased Securities
        having a Market Value equal to 103% of the Purchase Price.

             (b)  Purchased Securities shall be held in custody for Buyer
        by Seller in the Repurchase Collateral Account.  Seller shall
        indicate on its books for such account Buyer's ownership of the
        Purchased Securities.  Upon reasonable request from Buyer, Seller
        shall provide Buyer with a complete list of Purchased Securities
        owned by Buyer.  

             (c)  Upon demand by Buyer or Seller, Seller shall repurchase
        from Buyer, and Buyer shall sell to Seller, for the Repurchase
        Price all or any part of the Purchased Securities then owned by
        Buyer.

        4.   Margin Maintenance

             (a)  If at any time the aggregate Market Value of all
        Purchased Securities then owned by Buyer is less than 103% of the

                                        2PAGE
<PAGE>
        aggregate Repurchase Price for such Purchased Securities, then
        Seller shall transfer to Buyer additional Securities ("Additional
        Purchased Securities"), so that the aggregate Market Value of
        such Purchased Securities, including any such Additional
        Purchased Securities, will thereupon equal or exceed 103% of such
        aggregate Repurchase Price.

             (b)  If at any time the aggregate Market Value of all
        Purchased Securities then owned by Buyer exceeds 103% of the
        aggregate Repurchase Price for such Purchased Securities, then
        Seller may transfer Purchased Securities to Seller, so that the
        aggregate Market Value of such Purchased Securities will
        thereupon not exceed 103% of such aggregate Repurchase Price.

        5.   Interest Payments

             If during any fiscal month Buyer owned Purchased Securities,
        then on the first day of the next following fiscal month Seller
        shall pay to Buyer an amount equal to the sum of the aggregate
        Repurchase Prices of the Purchased Securities owned by Buyer at
        the close of each day during the preceding fiscal month divided
        by the number of days in such month and the product multiplied by
        the Pricing Rate times the number of days in such month divided
        by 360.

        6.   Income Payments and Voting Rights

             Where a particular Transaction's term extends over an Income
        payment date on the Purchased Securities subject to that
        Transaction, Buyer shall, on the date such Income is payable,
        transfer to Seller an amount equal to such Income payment or
        payments with respect to any Purchased Securities subject to such
        Transaction.  Seller shall retain all voting rights with respect
        to Purchased Securities sold to Buyer under this Agreement.


        7.   Security Interest

             Although the parties intend that all Transactions hereunder
        be sales and purchases and not loans, in the event any such
        Transactions are deemed to be loans, Seller shall be deemed to
        have pledged to Buyer as security for the performance by Seller
        of its obligations under each such Transaction and this
        Agreement, and shall be deemed to have granted to Buyer a
        security interest in, all of the Purchased Securities with
        respect to all Transactions hereunder and all proceeds thereof.

        8.   Payment and Transfer

             Unless otherwise mutually agreed, all transfers of funds
        hereunder shall be in immediately available funds.  As used
        herein with respect to Securities, "transfer" is intended to have

                                        3PAGE
<PAGE>
        the same meaning as when used in Section 8-313 of the
        Massachusetts Uniform Commercial Code or, where applicable, in
        any federal regulation governing transfers of the Securities.

        9.   Substitution

             Buyer hereby grants Seller the authority to manage, in
        Seller's sole discretion, the Purchased Securities held in
        custody for Buyer by Seller in the Repurchase Collateral Account.
        Buyer expressly agrees that Seller may (i) substitute other
        Securities for any Purchased Securities and (ii) commingle
        Purchased Securities with other Securities held in the Repurchase
        Collateral Account.  Substitutions shall be made by transfer to
        Buyer of such other Securities and transfer to Seller of the
        Purchased Securities for which substitution is being made.  After
        substitution, the substituted Securities shall be deemed to be
        Purchased Securities.  Securities which are substituted for
        Purchased Securities shall have a Market Value at the time of
        substitution equal to or greater than the Market Value of the
        Purchase Securities for which such Securities were substituted.

        10.  Representations

             Each of Buyer and Seller represents and warrants to the
        other that (i) it is duly authorized to execute and deliver this
        Agreement, to enter into the Transactions contemplated hereunder
        and to perform its obligations hereunder and has taken all
        necessary action to authorize such execution, delivery and
        performance, (ii) the person signing this Agreement on its behalf
        is duly authorized to do so on its behalf, (iii) it has obtained
        all authorizations of any governmental body required in
        connection with this Agreement and the Transactions hereunder and
        such authorizations are in full force and effect and (iv) the
        execution, delivery and performance of this Agreement and the
        Transactions hereunder will not violate any law, ordinance,
        charter, by-law or rule applicable to it or any agreement by
        which it is bound or by which any of its assets are affected.  On
        the date for any Transaction Buyer and Seller shall each be
        deemed to repeat all the foregoing representations made by it.

        11.  Events of Default

             In the event that (i) Seller fails to repurchase or Buyer
        fails to transfer Purchased Securities upon demand for repurchase
        from either Buyer or Seller, (ii) Seller or Buyer fails, after
        one business day's notice, to comply with Paragraph 4 hereof,
        (iii) Buyer fails to make payment to Seller pursuant to Paragraph
        6 hereof, (iv) Seller fails to comply with Paragraph 5 hereof,
        (v) an Act of Insolvency occurs with respect to Seller or Buyer,
        (vi) any representation made by Seller or Buyer shall have been
        incorrect or untrue in any material respect when made or repeated
        or deemed to have been made or repeated, or (vii) Seller or Buyer
        shall admit to the other its inability to, or its intention not

                                        4PAGE
<PAGE>
        to, perform any of its obligations hereunder (each an "Event of
        Default"):

             (a)  At the option of the nondefaulting party, exercised by
        written notice to the defaulting party (which option shall be
        deemed to have been exercised, even if no notice is given,
        immediately upon the occurrence of any Act of Insolvency), Seller
        shall become obligated to repurchase, and Buyer shall become
        obligated to sell, all Purchased Securities then owned by Buyer
        for the Repurchase Price of such Purchased Securities.

             (b)  If Seller is the defaulting party and Buyer exercises
        or is deemed to have exercised the option referred to in
        subparagraph (a) of this Paragraph, (i) the Seller's obligations
        hereunder to repurchase all Purchased Securities in such
        Transactions shall thereupon become immediately due and payable,
        (ii) all Income paid after such exercise or deemed exercise shall
        be retained by Buyer and applied to the aggregate unpaid
        Repurchase Prices owed by Seller, and (iii) Seller shall
        immediately deliver to Buyer any Purchased Securities subject to
        such Transactions then in Seller's possession.

             (c)  In all Transactions in which Buyer is the defaulting
        party, upon tender by Seller of payment of the aggregate
        Repurchase Prices for all such Transactions, Buyer's right, title
        and interest in all Purchased Securities subject to such
        Transactions shall be deemed transferred to Seller, and Buyer
        shall deliver all such Purchased Securities to Seller.

             (d)  After one business day's notice to the defaulting party
        (which notice need not be given if an Act of Insolvency shall
        have occurred, and which may be the notice given under
        subparagraph (a) of this Paragraph or the notice referred to in
        clause (ii) of the first sentence of this Paragraph), the
        nondefaulting party may: 

                  (i)  as to Transactions in which Seller is the
        defaulting party, (A) immediately sell, in a recognized market at
        such price or prices as Buyer may reasonably deem satisfactory,
        any or all Purchased Securities subject to such Transactions and
        apply the proceeds thereof to the aggregate unpaid Repurchase
        Prices and any other amounts owing by Seller hereunder or (B) in
        its sole discretion elect, in lieu of selling all or a portion of
        such Purchased Securities, to give Seller credit for such
        Purchased Securities in an amount equal to the price therefor on
        such date, obtained from a generally recognized source or the
        most recent closing bid quotation from such a source, against the
        aggregate unpaid Repurchase Prices and any other amounts owing by
        Seller hereunder; and

                  (ii)  as to Transactions in which Buyer is the
        defaulting party, (A) purchase securities ("Replacement
        Securities") of the same class and amount as any Purchased
        Securities that are not delivered by Buyer to Seller as required

                                        5PAGE
<PAGE>
        hereunder or (B) in its sole discretion elect, in lieu of
        purchasing Replacement Securities, to be deemed to have purchased
        Replacement Securities at the price therefor on such date,
        obtained from a generally recognized source or the most recent
        closing bid quotation from such a source.

             (e)  As to Transactions in which Buyer is the defaulting
        party, Buyer shall be liable to Seller (i) with respect to
        Purchased Securities (other than Additional Purchased
        Securities), for any excess of the price paid (or deemed paid) by
        Seller for Replacement Securities therefor over the Repurchase
        Price for such Purchased Securities and (ii) with respect to
        Additional Purchased Securities, for the price paid (or deemed
        paid) by Seller for the Replacement Securities therefor.  

             (g)  The defaulting party shall be liable to the
        nondefaulting party for the amount of all reasonable legal or
        other expenses incurred by the nondefaulting party in connection
        with or as a consequence of an Event of Default.

             (h)  The nondefaulting party shall have, in addition to its
        rights hereunder, any rights otherwise available to it under any
        other agreement or applicable law.

        12.  Single Agreement

             Buyer and Seller acknowledge that, and have entered hereinto
        and will enter into each Transaction hereunder in consideration
        of and in reliance upon the fact that, all Transactions hereunder
        constitute a single business and contractual relationship and
        have been made in consideration of each other.  Accordingly, each
        of Buyer and Seller agrees (i) to perform all of its obligations
        in respect of each Transaction hereunder, and that a default in
        the performance of any such obligations shall constitute a
        default by it in respect of all Transactions hereunder, (ii) that
        each of them shall be entitled to set off claims and apply
        property held by them in respect of any Transaction against
        obligations owing to them in respect of any other Transactions
        hereunder and (iii) that payments, deliveries and other transfers
        made by either of them in respect of any Transaction shall be
        deemed to have been made in consideration of payments, deliveries
        and other transfers in respect of any other Transactions
        hereunder, and the obligations to make any such payments,
        deliveries and other transfers may be applied against each other
        and netted.

        13.  Entire Agreement; Severability

             This Agreement shall supersede any existing agreements
        between the parties containing general terms and conditions for
        repurchase transactions.  Each provision and agreement and
        agreement herein shall be treated as separate and independent
        from any other provision or agreement herein and shall be


                                        6PAGE
<PAGE>
        enforceable notwithstanding the unenforceability of any such
        other provision or agreement.

        14.  Non-assignability; Termination

             The rights and obligations of the parties under this
        Agreement and under any Transactions shall not be assigned by
        either party without the prior written consent of the other
        party.  Subject to the foregoing, this Agreement and any
        Transactions shall be binding upon and shall inure to the benefit
        of the parties and their respective successors and assigns.  This
        Agreement may be canceled by either party upon giving written
        notice to the other, except that this Agreement shall,
        notwithstanding such notice, remain applicable to any
        Transactions then outstanding.

        15.  Governing Law

             This Agreement shall be governed by the laws of the
        Commonwealth of Massachusetts without giving effect to the
        conflict of law principles thereof.

        16.  No Waivers, Etc.

             No express or implied waiver of any Event of Default by
        either party shall constitute a waiver of any other Event of
        Default and no exercise of any remedy hereunder by any party
        shall constitute a wavier of its right to exercise any other
        remedy hereunder.  No modification or waiver of any provision of
        this Agreement and no consent by any party to a departure
        herefrom shall be effective unless and until such shall be in
        writing and duly executed by both of the parties hereto. 

        17.  Intent

             (a)  The parties recognize that each Transaction is a
        "repurchase agreement" as that term is defined in Section 101 of
        Title 11 of the United States Code, as amended (except insofar as
        the type of Securities subject to such Transaction or the term of
        such Transaction would render such definition inapplicable), and
        a "securities contract" as that term is defined in Section 741 of
        Title 11 of the United States Code, as amended.

             (b)  It is understood that either party's right to liquidate
        Securities delivered to it in connection with Transactions
        hereunder or to exercise any other remedies pursuant to Paragraph
        11 hereof, is a contractual right to liquidate such Transaction
        as described in Sections 555 and 559 of Title 11 of the United
        States Code, as amended.
                                        7PAGE
<PAGE>
             IN WITNESS WHEREOF, the parties have executed this Agreement
        as of December 28, 1996.


        THERMO ELECTRON CORPORATION        THERMO INSTRUMENT SYSTEMS INC.


        By:_____________________________   By:_______________________

        Name:     Jonathan W. Painter      Name:     Earl Lewis
        Title:    Treasurer                Title:    President






                                                         Exhibit 10.10

                         THERMO INSTRUMENTS SYSTEMS INC.
                     RESTATED STOCK HOLDING ASSISTANCE PLAN


        SECTION 1.   Purpose.

             The purpose of this Plan is to benefit Thermo Instrument
        Systems Inc.  (the "Company") and its stockholders by encouraging
        Key Employees to acquire and maintain share ownership in the
        Company, by increasing such employees' proprietary interest in
        promoting the growth and performance of the Company and its
        subsidiaries and by providing for the implementation of the Stock
        Holding Policy.  

        SECTION 2.     Definitions.

             The following terms, when used in the Plan, shall have the
        meanings set forth below:

             Committee:   The Human Resources Committee of the Board of
        Directors of the Company as appointed from time to time.

             Common Stock:   The common stock of the Company and any
        successor thereto.

             Company:   Thermo Instrument Systems Inc., a Delaware
        corporation.

             Stock Holding Policy:   The Stock Holding Policy of the
        Company, as adopted by the Committee and as in effect from time
        to time.

             Key Employee:   Any employee of the Company or any of its
        subsidiaries, including any officer or member of the Board of
        Directors who is also an employee, as designated by the
        Committee, and who, in the judgment of the Committee, will be in
        a position to contribute significantly to the attainment of the
        Company's strategic goals and long-term growth and prosperity.

             Loans:   Loans extended to Key Employees by the Company
        pursuant to this Plan.

             Plan:   The Thermo Instrument Systems Inc. Stock Holding
        Assistance Plan, as amended from time to time.

        SECTION 3.     Administration.

             The Plan and the Stock Holding Policy shall be administered
        by the Committee, which shall have authority to interpret the
        Plan and the Stock Holding Policy and, subject to their
        provisions, to prescribe, amend and rescind any rules and
        regulations and to make all other determinations necessary or
        desirable for the administration thereof.  The Committee's
PAGE
<PAGE>
        interpretations and decisions with regard to the Plan and the
        Stock Holding Policy and such rules and regulations as may be
        established thereunder shall be final and conclusive.  The
        Committee may correct any defect or supply any omission or
        reconcile any inconsistency in the Plan or the Stock Holding
        Policy, or in any Loan in the manner and to the extent the
        Committee deems desirable to carry it into effect.  No member of
        the Committee shall be liable for any action or omission in
        connection with the Plan or the Stock Holding Policy that is made
        in good faith.

        SECTION 4.     Loans and Loan Limits.

             The Committee has determined that the provision of Loans
        from time to time to Key Employees in such amounts as to cause
        such Key Employees to comply with the Stock Holding Policy is, in
        the judgment of the Committee, reasonably expected to benefit the
        Company and authorizes the Company to extend Loans from time to
        time to Key Employees in such amounts as may be requested by such
        Key Employees in order to comply with the Stock Holding Policy.
        Such Loans may be used solely for the purpose of acquiring Common
        Stock (other than upon the exercise of stock options or under
        employee stock purchase plans) in open market transactions or
        from the Company.

             Each Loan shall be full recourse and evidenced by a
        non-interest bearing promissory note substantially in the form
        attached hereto as Exhibit A (the "Note") and maturing in
        accordance with the provisions of Section 6 hereof, and
        containing such other terms and conditions, which are not
        inconsistent with the provisions of the Plan and the Stock
        Holding Policy, as the Committee shall determine in its sole and
        absolute discretion.

        SECTION 5.     Federal Income Tax Treatment of Loans.

             For federal income tax purposes, interest on Loans shall be
        imputed on any interest free Loan extended under the Plan.  A Key
        Employee shall be deemed to have paid the imputed interest to the
        Company and the Company shall be deemed to have paid said imputed
        interest back to the Key Employee as additional compensation.
        The deemed interest payment shall be taxable to the Company as
        income, and may be deductible to the Key Employee to the extent
        allowable under the rules relating to investment interest.  The
        deemed compensation payment to the Key Employee shall be taxable
        to the employee and deductible to the Company, but shall also be
        subject to employment taxes such as FICA and FUTA.

        SECTION 6.     Maturity of Loans.

             Each Loan to a Key Employee hereunder shall be due and
        payable on demand by the Company.  If no such demand is made,
        then each Loan shall mature and the principal thereof shall
        become due and payable in five equal annual installments from the

                                        2PAGE
<PAGE>
        payment of annual cash incentive compensation (referred to as
        bonus) to the Key Employee by the Company, beginning with the
        first such bonus payment to occur after the date of the Note
        evidencing the Loan, and on each of the next four bonus payment
        dates, provided that the Committee may, in its sole and absolute
        discretion, authorize such other maturity and repayment schedule
        as the Committee may determine.  Each Loan shall also become
        immediately due and payable in full, without demand, upon  the
        occurrence of any of the events set forth in the Note; provided
        that the Committee may, in its sole and absolute discretion,
        authorize an extension of the time for repayment of a Loan upon
        such terms and conditions as the Committee may determine.

        SECTION 7.     Amendment and Termination of the Plan.

             The Committee may from time to time alter or amend the Plan
        or the Stock Holding Policy in any respect, or terminate the Plan
        or the Stock Holding Policy at any time.  No such amendment or
        termination, however, shall alter or otherwise affect the terms
        and conditions of any Loan then outstanding to Key Employee
        without such Key Employee's written consent, except as otherwise
        provided herein or in the promissory note evidencing such Loan.

        SECTION 8.     Miscellaneous Provisions.

             (a)  No employee or other person shall have any claim or
        right to receive a Loan under the Plan, and no employee shall
        have any right to be retained in the employ of the Company due to
        his or her participation in the Plan.

             (b)  No Loan shall be made hereunder unless counsel for the
        Company shall be satisfied that such Loan will be in compliance
        with applicable federal, state and local laws.

             (c)  The expenses of the Plan shall be borne by the Company.

             (d)  The Plan shall be unfunded, and the Company shall not
        be required to establish any special or separate fund or to make
        any other segregation of assets to assure the making of any Loan
        under the Plan.

             (e)  Except as otherwise provided in Section 7 hereof, by
        accepting any Loan under the Plan, each Key Employee shall be
        conclusively deemed to have indicated his acceptance and
        ratification of, and consent to, any action taken under the Plan
        or the Stock Holding Policy by the Company, the Board of
        Directors of the Company or the Committee.

             (f)  The appropriate officers of the Company shall cause to
        be filed any reports, returns or other information regarding
        Loans hereunder, as may be required by any applicable statute,
        rule or regulation.

        SECTION 9.     Effective Date.

                                        3PAGE
<PAGE>
             The Plan and the Stock Holding Policy shall become effective
        upon approval and adoption by the Committee.































                                        4PAGE
<PAGE>
                               EXHIBIT A TO STOCK HOLDING ASSISTANCE PLAN


                         THERMO INSTRUMENT SYSTEMS INC.

                                 Promissory Note



        $_________                                                       
                                                Dated:____________


             For value received, ________________, an individual whose
        residence is located at _______________________ (the "Employee"),
        hereby promises to pay to Thermo Instrument Systems Inc. (the
        "Company"), or assigns, ON DEMAND, but in any case on or before
        [insert date which is the fifth anniversary of date of issuance]
        (the "Maturity Date"), the principal sum of [loan amount in
        words] ($_______), or such part thereof as then remains unpaid,
        without interest.  Principal shall be payable in lawful money of
        the United States of America, in immediately available funds, at
        the principal office of the Company or at such other place as the
        Company may designate from time to time in writing to the
        Employee. 

              Unless the Company has already made a demand for payment in
        full of this Note, the Employee agrees to repay the Company  an
        amount equal to 20% of the initial principal amount of the Note
        from the payment of annual cash incentive compensation (referred
        to as bonus) to the Employee by the Company, beginning with the
        first such bonus payment to occur after the date of this Note,
        and on each of the next four bonus payment dates.  Any amount
        remaining unpaid under this Note, if no demand has been made by
        the Company, shall be due and payable on the Maturity Date.

             This Note may be prepaid at any time or from time to time,
        in whole or in part, without any premium or penalty.  The
        Employee acknowledges and agrees that the Company has advanced to
        the Employee the principal amount of this Note pursuant to the
        Company's Stock Holding Assistance Plan, and that all terms and
        conditions of such Plan are incorporated herein by reference.  

             The unpaid principal amount of this Note shall be and become
        immediately due and payable without notice or demand, at the
        option of the Company, upon the occurrence of any of the
        following events:

                  (a)  the termination of the Employee's employment with
        the Company, with or without cause, for any reason or for no
        reason;

                  (b)  the death or disability of the Employee;


                                        5PAGE
<PAGE>
                  (c)  the failure of the Employee to pay his or her
        debts as they become due, the insolvency of the Employee, the
        filing by or against the Employee of any petition under the
        United States Bankruptcy Code (or the filing of any similar
        petition under the insolvency law of any jurisdiction), or the
        making by the Employee 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 Employee; or

                  (d)  the issuance of any writ of attachment, by trustee
        process or otherwise, or any restraining order or injunction not
        removed, repealed or dismissed within thirty (30) days of
        issuance, against or affecting the person or property of the
        Employee or any liability or obligation of the Employee to the
        Company.

             In case any payment herein provided for shall not be paid
        when due, the Employee further promises to pay all costs of
        collection, including all reasonable attorneys' fees.

             No delay or omission on the part of the Company in
        exercising any right hereunder shall operate as a waiver of such
        right or of any other right of the Company, nor shall any delay,
        omission or waiver on any one occasion be deemed a bar to or
        waiver of the same or any other right on any future occasion.
        The Employee hereby waives presentment, demand, notice of
        prepayment, protest and all other demands and notices in
        connection with the delivery, acceptance, performance, default or
        enforcement of this Note.  The undersigned hereby assents to any
        indulgence and any extension of time for payment of any
        indebtedness evidenced hereby granted or permitted by the
        Company.  

             This Note has been made pursuant to the Company's Stock
        Holding Assistance Plan and shall be governed by and construed in
        accordance with, such Plan and the laws of the State of Delaware
        and shall have the effect of a sealed instrument.


                                      _______________________________

                                      Employee Name: _________________


        ________________________
        Witness



                                                        Exhibit 10.27

                         THERMO INSTRUMENT SYSTEMS INC.
             THERMO OPTEK CORPORATION NONQUALIFIED STOCK OPTION PLAN


        1.   Purpose

             This Nonqualified Stock Option Plan (the "Plan") is intended
        to encourage  ownership of  Common Stock,  $0.01 par  value  (the
        "Common Stock"), of  Thermo Optek  Corporation  ("Subsidiary"), a
        subsidiary of Thermo Instrument Systems Inc.  (the "Company"), by
        persons selected  by  the  Board of  Directors  (or  a  committee
        thereof) in its sole  discretion, including directors,  executive
        officers, key employees  and consultants of  the Company and  its
        subsidiaries, and  to provide  additional incentive  for them  to
        promote  the  success  of  the   business  of  the  Company   and
        Subsidiary.   The Plan  is intended  to be  a nonstatutory  stock
        option plan.

        2.   Effective Date of the Plan

             The Plan shall become effective when adopted by the Board of
        Directors of the Company.

        3.   Stock Subject to Plan

             At no time shall  the number of shares  of the Common  Stock
        then outstanding  which  are  attributable  to  the  exercise  of
        options granted under  the Plan  plus the number  of shares  then
        issuable upon the exercise  of outstanding options granted  under
        the Plan  exceed 1,000,000 shares  (as adjusted  to reflect  the
        three-for-two stock split  effected in  the form of  a 50%  stock
        dividend in April 1996), subject  however,  to the provisions  of
        paragraph 11 of the Plan.  Shares to be issued upon the  exercise
        of options granted under the  Plan shall be shares of  Subsidiary
        beneficially owned  by the  Company.   If any  option expires  or
        terminates for any reason without having been exercised in  full,
        the unpurchased shares subject  thereto shall again be  available
        for options thereafter to be granted.

        4.   Administration

             The  Plan  shall  be   administered  by  a  committee   (the
        "Committee") composed of the members of the Board of Directors of
        the Company,  no  member  of  which shall  act  upon  any  matter
        exclusively affecting  any option  granted or  to be  granted  to
        himself or herself under the Plan.  Subject to the provisions  of
        the Plan, the  Committee shall  have complete  authority, in  its
        discretion, to make the following determinations with respect  to
        each option to  be granted  by the Company:   (a)  the person  to
        receive the option (the "Optionee"); (b) the time of granting the
        option; (c) the number of shares subject thereto; (d) the  option
        price; (e) the option period; and (f) the terms of the option and
        form of option agreement (which need not be identical, but  which
PAGE
<PAGE>
        shall conform to the applicable terms and conditions of the  Plan
        and contain such other provisions as the Board of Directors deems
        advisable and not inconsistent  with the Plan).   In making  such
        determinations, the Committee may take into account the nature of
        the  services  rendered  by  the  Optionees,  their  present  and
        potential contributions to the success of the Company and/or  one
        or more  of  its subsidiaries,  and  such other  factors  as  the
        Committee in its discretion shall deem relevant.  Subject to  the
        provisions of the  Plan, the Committee  shall also have  complete
        authority to interpret the Plan, to prescribe, amend, and rescind
        rules and regulations relating to it, to determine the terms  and
        provisions of the respective option agreements (which need not be
        identical), and  to make  all other  determinations necessary  or
        advisable for the  administration of the  Plan.  The  Committee's
        determinations on the  matters referred  to in  this paragraph  4
        shall be conclusive.

        5.   Eligibility

             An option  may be  granted  to any  person selected  by  the
        Committee in its sole discretion.

        6.   Time of Granting Options

             The granting  of an  option  shall take  place at  the  time
        specified by the Committee.  Only if expressly so provided by the
        Committee shall the granting of  an option be regarded as  taking
        place at the time when a written option agreement shall have been
        duly executed and delivered  by or on behalf  of the Company  and
        the Optionee to whom such option shall be granted.  The agreement
        shall provide, among other things,  that it does not confer  upon
        an Optionee any right  to continue in the  employ of the  Company
        and/or one  or more  of  its subsidiaries  or  to continue  as  a
        director or  consultant of  the  Company, and  that it  does  not
        interfere in any way  with the right of  the Company or any  such
        subsidiary to terminate  the employment  of the  Optionee at  any
        time if the Optionee is an employee, to remove the Optionee as  a
        director of the  Company if  the Optionee  is a  director, or  to
        terminate the  services of  the  Optionee if  the Optionee  is  a
        consultant.

        7.   Option Period

             An option  may become  exercisable  immediately or  in  such
        installments, cumulative or noncumulative,  as the Committee  may
        determine.  

        8.   Exercise of Option

             An option may be exercised  in accordance with its terms  by
        written notice of intent to  exercise the option, specifying  the
        number of shares  of stock with  respect to which  the option  is
        then being exercised.  The notice shall be accompanied by payment
        in the form  of cash or  shares of Subsidiary  Common Stock  (the
PAGE
<PAGE>
        "Tendered Shares") with a then current market value equal to  the
        option price of  the shares to  be purchased; provided,  however,
        that such  Tendered  Shares  shall  have  been  acquired  by  the
        Optionee more  than six  months prior  to the  date of  exercise,
        unless such  requirement is  waived in  writing by  the  Company.
        Against such payment  the Company  shall deliver or  cause to  be
        delivered to the Optionee a certificate for the number of  shares
        then being purchased, registered in  the name of the Optionee  or
        other person exercising  the option.   If any  law or  applicable
        regulation of  the Securities  and Exchange  Commission or  other
        body having  jurisdiction  in  the  premises  shall  require  the
        Company, Subsidiary  or  the  Optionee  to  take  any  action  in
        connection with  shares  being  purchased upon  exercise  of  the
        option, exercise of the option and delivery of the certificate or
        certificates for such shares shall be postponed until  completion
        of the necessary action,  which shall be  taken at the  Company's
        expense.

        9.   Transferability

             Options shall not be transferable, otherwise than by will or
        the laws of descent and distribution, except as may be authorized
        by the Committee, in its  sole discretion. T he Committee may, in
        its discretion, determine the extent to which options granted  to
        an Optionee shall be transferable, and such provisions permitting
        transfer shall  be  set forth  in  the written  option  agreement
        executed and delivered  by or on  behalf of the  Company and  the
        Optionee.

        10.  Vesting, Restrictions and Termination of Options

             The Committee,  in its  sole discretion,  may determine  the
        manner in which options shall vest, the rights of the Company  to
        repurchase the shares issued upon the exercise of any option  and
        the manner in which such rights  shall lapse, and the terms  upon
        which any option granted shall terminate.  The Board of Directors
        shall have the right  to accelerate the date  of exercise of  any
        installment  or  to  accelerate   the  lapse  of  the   Company's
        repurchase rights.   All of such  terms shall be  specified in  a
        written option agreement executed and  delivered by or on  behalf
        of the Company  and the  Optionee to  whom such  option shall  be
        granted.

        11.  Adjustment of Number of Shares

             Each stock option agreement shall provide that in the  event
        of any stock dividend payable in the Common Stock or any split-up
        or contraction  in  the number  of  shares of  the  Common  Stock
        occurring after  the  date of  the  agreement and  prior  to  the
        exercise in full of  the option, the number  of shares for  which
        the option may thereafter  be exercised shall be  proportionately
        adjusted and the price to be  paid for each share subject to  the
        option shall be  proportionately adjusted.   Each such  agreement
        shall also provide that in case of any reclassification or change
PAGE
<PAGE>
        of outstanding  shares of  the Common  Stock or  in case  of  any
        consolidation or  merger  of  Subsidiary  with  or  into  another
        company or in case of any  sale or conveyance to another  company
        or  entity  of  the  property   of  Subsidiary  as  a  whole   or
        substantially as a  whole, the Optionee  shall, upon exercise  of
        the option,  be entitled  to  receive shares  of stock  or  other
        securities in its  place equivalent  in kind and  value to  those
        shares which  he would  have  received if  he had  exercised  the
        option  in  full  immediately  prior  to  such  reclassification,
        change,  consolidation,  merger,  sale  or  conveyance  and   had
        continued to hold the shares subject to the option (together with
        all other  shares,  stock  and securities  thereafter  issued  in
        respect thereof)  to the  time  of the  exercise of  the  option;
        provided, that if any recapitalization is to be effected  through
        an increase  in the  par value  of the  Common Stock  without  an
        increase in  the number  of authorized  shares and  such new  par
        value will  exceed the  option price  under such  agreement,  the
        Company   shall   notify   the   Optionee   of   such    proposed
        recapitalization, and  the Optionee  shall then  have the  right,
        exercisable at any time  prior to such recapitalization  becoming
        effective, to purchase all  of the shares  subject to the  option
        which  he  has  not  theretofore  purchased  (anything  in   such
        agreement to the contrary  notwithstanding), but if the  Optionee
        fails to exercise such right before such recapitalization becomes
        effective,  the  option  price  under  such  agreement  shall  be
        appropriately  adjusted.    Each  such  agreement  shall  further
        provide that upon dissolution  or liquidation of Subsidiary,  the
        option shall  terminate, but  the  Optionee (if  at the  time  an
        employee or director of the Company and/or any one or more of its
        subsidiaries) shall  have the  right, immediately  prior to  such
        dissolution or liquidation,  to exercise the  option to the  full
        extent not theretofore exercised; that no adjustment provided for
        above shall apply to any share  with respect to which the  option
        has  been  exercised  prior  to   the  effective  date  of   such
        adjustment; and that no fraction of a share or fractional  shares
        shall be purchasable or deliverable under such agreement, but  in
        the event  any  adjustment thereunder  of  the number  of  shares
        covered by  the  option shall  cause  such number  to  include  a
        fraction of  a share,  such  fraction shall  be adjusted  to  the
        nearest smaller whole number of shares.  In the event of  changes
        in the outstanding Common Stock by reason of any stock  dividend,
        split-up, contraction, reclassification, or change of outstanding
        shares of the  Common Stock  of the nature  contemplated by  this
        paragraph 11, the number of shares of Common Stock available  for
        the purpose of the Plan as stated in paragraph 3 hereof shall  be
        correspondingly adjusted by the Committee.

        12.  Limitation of Rights in Option Stock

             The Optionees  shall  have  no  rights  as  stockholders  in
        respect of shares as to which  their options shall not have  been
        exercised, certificates  issued  and  delivered  and  payment  as
        herein provided  made in  full,  and shall  have no  rights  with
        respect to such shares not expressly conferred by this Plan.
PAGE
<PAGE>
        13.  Stock Reserved

             The Company  shall  at all  times  during the  term  of  the
        options reserve and keep available  such number of shares of  the
        Common Stock as will be sufficient to satisfy the requirements of
        this Plan and shall pay  all other fees and expenses  necessarily
        incurred by the Company in connection therewith.

        14.  Securities Laws Restrictions

             Each Optionee exercising  an option, at  the request of  the
        Company, will  be  required  to give  a  representation  in  form
        satisfactory  to  counsel  for  the  Company  that  he  will  not
        transfer, sell or otherwise dispose  of the shares received  upon
        exercise of  the  option  at  any time  purchased  by  him,  upon
        exercise of any portion  of the option, in  a manner which  would
        violate  the  Securities  Act  of  1933,  as  amended,  and   the
        regulations of the Securities and Exchange Commission  thereunder
        and the Company  may, if required  or at its  discretion, make  a
        notation on any certificates issued  upon exercise of options  to
        the effect that  such certificate may  not be transferred  except
        after  receipt  by   the  Company  of   an  opinion  of   counsel
        satisfactory to  it to  the effect  that such  transfer will  not
        violate such Act and such regulations.

        15.  Tax Withholding

             The Company shall have the right to deduct from payments  of
        any kind otherwise due to an Optionee any federal, state or local
        taxes of any kind required by law to be withheld with respect  to
        any shares issued upon  exercise of options  under the Plan  (the
        "withholding requirements").  The  Committee will have the  right
        to require that the Optionee or other appropriate person remit to
        the Company  an  amount  sufficient to  satisfy  the  withholding
        requirements, or  make  other arrangements  satisfactory  to  the
        Committee with regard to such requirements, prior to the delivery
        of any Common Stock pursuant to exercise of an option.  If and to
        the extent that such withholding  is required, the Committee  may
        permit the Optionee or  such other person to  elect at such  time
        and in such manner as the Committee provides to have the  Company
        hold back from the shares to  be delivered, or to deliver to  the
        Company, Common Stock  having a value  calculated to satisfy  the
        withholding requirements.

        16.  Termination and Amendment of Plan

             The Board of  Directors may at  any time, and  from time  to
        time, modify or amend the Plan in any respect.

             Notwithstanding any other provisions hereof, the Plan  shall
        terminate on December 31,  2006 and no  options shall be  granted
        hereunder thereafter.
<PAGE>




                                                                      Exhibit 11

                         THERMO INSTRUMENT SYSTEMS INC.

                        Computation of Earnings per Share


                                             1996          1995            1994
 ------------------------------------------------------------------------------
 Computation of Fully
   Diluted Earnings per Share
   from Continuing Operations:

 Income:
   Income from continuing
     operations                     $132,751,000   $ 79,304,000   $ 58,261,000

   Add: Convertible obligation
        interest, net of tax           5,288,000      5,729,000      6,315,000
                                    ------------   ------------   ------------
   Income from continuing operations
     applicable to common stock
     assuming full dilution (a)     $138,039,000   $ 85,033,000   $ 64,576,000
                                    ------------   ------------   ------------
 Shares:
   Weighted average shares
     outstanding                      95,085,318     90,577,966     88,173,053
   
   Add: Shares issuable from
        assumed conversion of
        convertible obligations       12,233,650     15,503,734     17,539,251

        Shares issuable from
        assumed exercise of
        options (as determined
        by the application of
        the treasury stock method)       992,648        870,643        410,542
                                    ------------   ------------   ------------
   Weighted average shares
     outstanding, as adjusted (b)    108,311,616    106,952,343    106,122,846
                                    ------------   ------------   ------------
 Fully Diluted Earnings per Share
   from Continuing Operations
   (a) / (b)                        $       1.27   $        .80   $        .61
                                    ============   ============   ============
PAGE
<PAGE>
                                                                      Exhibit 11

                         THERMO INSTRUMENT SYSTEMS INC.

                  Computation of Earnings per Share (continued)



                                             1996          1995            1994
 ------------------------------------------------------------------------------
 Computation of Fully
   Diluted Earnings per Share:

 Income:
   Net income                       $132,751,000   $ 79,306,000   $ 60,220,000

   Add: Convertible obligation
        interest, net of tax           5,288,000      5,729,000      6,315,000
                                    ------------   ------------   ------------
   Income applicable to common stock
     assuming full dilution (a)     $138,039,000   $ 85,035,000   $ 66,535,000
                                    ------------   ------------   ------------
 Shares:
   Weighted average shares
     outstanding                      95,085,318     90,577,966     88,173,053
   
   Add: Shares issuable from
        assumed conversion of
        convertible obligations       12,233,650     15,503,734     17,539,251

        Shares issuable from
        assumed exercise of
        options (as determined
        by the application of
        the treasury stock method)       992,648        870,643        410,542
                                    ------------   ------------   ------------
   Weighted average shares
     outstanding, as adjusted (b)    108,311,616    106,952,343    106,122,846
                                    ------------   ------------   ------------
 Fully Diluted Earnings per Share
   (a) / (b)                        $       1.27   $        .80   $        .63
                                    ============   ============   ============


                                                                  Exhibit 13






















                        THERMO INSTRUMENT SYSTEMS INC.

                      Consolidated Financial Statements

                                     1996
PAGE
<PAGE>
   Thermo Instrument Systems Inc.                    1996 Financial Statements

                        Consolidated Statement of Income

   (In thousands except per share amounts)       1996       1995        1994
   --------------------------------------------------------------------------
   Revenues (Note 13)                      $1,209,362 $  782,662  $  649,992
                                           ---------- ----------  ----------
   Costs and Operating Expenses:
    Cost of revenues                          654,165    403,443     335,341
    Selling, general, and administrative
      expenses (Note 9)                       340,963    220,436     174,490
    Research and development expenses          84,091     54,314      42,924
    Write-off of acquired technology
       (Note 4)                                 3,500          -           -
                                           ---------- ----------  ----------
                                            1,082,719    678,193     552,755
                                           ---------- ----------  ----------
   Operating Income                           126,643    104,469      97,237

   Interest Income                             20,490     14,646       5,935
   Interest Expense (includes $8,145,
     $5,512, and $5,384 to parent company)    (28,923)   (18,129)    (15,761)
   Gain on Issuance of Stock by
    Subsidiaries (Note 11)                     71,713     20,128       6,469
   Gain on Sale of Related Party
     Investments (Note 9)                           -      2,227       2,000
                                           ---------- ----------  ----------
   Income from Continuing Operations
     Before Provision for Income Taxes
     and Minority Interest Expense            189,923    123,341      95,880
   Provision for Income Taxes (Note 6)         51,727     42,713      37,507
   Minority Interest Expense                    5,445      1,324         112
                                           ---------- ----------  ----------
   Income from Continuing Operations          132,751     79,304      58,261
   Income from Discontinued Operations
    (net of applicable income taxes of 
    $1,655 in 1994; Note 3)                         -          2       1,959
                                           ---------- ----------  ----------
   Net Income                              $  132,751 $   79,306  $   60,220
                                           ========== ==========  ==========
   Earnings per Share from
     Continuing Operations:
       Primary                             $     1.40 $      .88  $      .66
                                           ========== ==========  ==========
       Fully diluted                       $     1.27 $      .80  $      .61
                                           ========== ==========  ==========
   Earnings per Share:
       Primary                             $     1.40 $      .88  $      .68
                                           ========== ==========  ==========
       Fully diluted                       $     1.27 $      .80  $      .63
                                           ========== ==========  ==========
   Weighted Average Shares:
       Primary                                 95,085     90,578      88,173
                                           ========== ==========  ==========
       Fully diluted                          108,312    106,952     106,123
                                           ========== ==========  ==========
   The accompanying notes are an integral part of these consolidated
   financial statements.
                                        2PAGE
<PAGE>
    Thermo Instrument Systems Inc.                  1996 Financial Statements

                           Consolidated Balance Sheet

    (In thousands)                                         1996         1995
    ------------------------------------------------------------------------
    Assets
    Current Assets:
     Cash and cash equivalents                       $  522,688   $  395,233
     Available-for-sale investments, at quoted
        market value (amortized cost of
        $7,430; Note 2)                                   7,452            -
     Accounts receivable, less allowances of
       $16,981 and $12,569                              303,331      211,906
     Unbilled contract costs and fees                     6,043        3,800
     Inventories                                        213,683      154,914
     Prepaid expenses                                    13,417        9,450
     Prepaid income taxes (Note 6)                       58,296       31,233
                                                     ----------   ----------
                                                      1,124,910      806,536
                                                     ----------   ----------
    Property, Plant, and Equipment, at Cost, Net        178,663      133,677
                                                     ----------   ----------
    Patents and Other Assets                             32,454       29,611
                                                     ----------   ----------
    Cost in Excess of Net Assets of Acquired
      Companies (Notes 4 and 6)                         588,373      402,989
                                                     ----------   ----------
                                                     $1,924,400   $1,372,813
                                                     ==========   ==========




                                        3PAGE
<PAGE>
    Thermo Instrument Systems Inc.                  1996 Financial Statements

                     Consolidated Balance Sheet (continued)

    (In thousands except share amounts)                    1996         1995
    ------------------------------------------------------------------------
    Liabilities and Shareholders' Investment
    Current Liabilities:
     Notes payable (Note 7)                          $   89,462  $   55,822
     Accounts payable                                    83,161      55,626
     Accrued payroll and employee benefits               51,728      33,025
     Accrued income taxes (includes $10,839 and
        $8,096 due to parent company)                    39,686      25,875
     Accrued installation and warranty expenses          44,211      17,962
     Accrued acquisition expenses (Note 4)               30,025      20,687
     Deferred revenue                                    35,959      20,759
     Other accrued expenses                             101,646      73,966
     Due to parent company                               12,329      12,919
                                                     ----------  ----------
                                                        488,207     316,641
                                                     ----------  ----------
    Deferred Income Taxes (Note 6)                       20,710      20,168
                                                     ----------  ----------
    Other Deferred Items                                 29,805      23,718
                                                     ----------  ----------
    Long-term Obligations (Note 7):
     Senior convertible obligations (includes
       $140,000 due to parent company)                  334,781     207,600
     Subordinated convertible obligations               192,500     214,775
     Other (includes $15,000 in 1996 due to
        parent company)                                  26,933      18,659
                                                     ----------  ----------
                                                        554,214     441,034
                                                     ----------  ----------
    Minority Interest                                    85,197      28,547
                                                     ----------  ----------
    Commitments and Contingencies (Note 8)

    Shareholders' Investment (Notes 5 and 10):
     Common stock, $.10 par value, 250,000,000
        shares authorized; 97,674,228 and
        92,566,341 shares issued                          9,767       9,257
     Capital in excess of par value                     319,464     248,468
     Retained earnings                                  424,641     291,890
     Treasury stock at cost, 750,055 and
        917,985 shares                                   (8,679)     (9,724)
     Cumulative translation adjustment                    1,060       2,814
     Net unrealized gain on available-for-sale
        investments (Note 2)                                 14           -
                                                     ----------  ----------
                                                        746,267     542,705
                                                     ----------  ----------
                                                     $1,924,400  $1,372,813
                                                     ==========  ==========

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

                                        4PAGE
<PAGE>
    Thermo Instrument Systems Inc.                  1996 Financial Statements

                      Consolidated Statement of Cash Flows

    (In thousands)                             1996        1995        1994
    -----------------------------------------------------------------------
    Operating Activities:
      Net income                          $ 132,751   $  79,306   $  60,220
      Adjustments to reconcile net
        income to net cash provided by
        operating activities:
          Provision for losses on
            accounts receivable               2,274       2,543         733
          Depreciation and amortization      44,233      25,257      22,810
          Write-off of acquired
            technology (Note 4)               3,500           -           -
          Gain on issuance of stock by
            subsidiaries (Note 11)          (71,713)    (20,128)     (6,469)
          Gain on sale of related 
            party investments (Note 9)            -      (2,227)     (2,000)
          Minority interest expense           5,445       1,324         112
          Increase (decrease) in deferred
            income taxes                       (757)      2,196       1,816
          Other noncash expenses              4,889       2,964         363
          Changes in current accounts,
            excluding the effects of
            acquisitions:
              Accounts receivable             1,394     (22,661)     (2,586)
              Inventories                    14,184      (7,433)      6,422
              Other current assets            3,978       3,058         (12)
              Accounts payable               (9,903)      1,202       7,745
              Other current liabilities     (37,456)     (4,968)     (8,315)
          Other                                 290        (315)        (84)
                                          ---------   ---------   ---------
    Net cash provided by operating 
      activities                             93,109      60,118      80,755
                                          ---------   ---------   ---------

    Investing Activities:
      Acquisitions, net of cash acquired
        (Note 4)                           (248,150)    (89,469)   (101,336)
      Proceeds from sale of services
        businesses (Note 3)                       -      34,267           -
      Purchases of available-for-sale
        investments                         (10,250)          -     (23,105)
      Proceeds from sale and maturities of
        available-for-sale investments        3,000      17,825      16,250
      Purchases of property, plant, and
        equipment                           (19,134)    (10,313)     (8,190)
      Proceeds from sale of property,
        plant, and equipment                  4,597       2,252       2,075
      Other                                     530      (1,691)       (861)
                                          ---------   ---------   ---------
    Net cash used in investing activities $(269,407)  $ (47,129)  $(115,167)
                                          ---------   ---------   ---------

                                        5PAGE
<PAGE>
    Thermo Instrument Systems Inc.                  1996 Financial Statements

                Consolidated Statement of Cash Flows (continued)

    (In thousands)                             1996        1995        1994
    -----------------------------------------------------------------------
    Financing Activities:
      Net proceeds from issuance of
        Company and subsidiaries'
        common stock (Note 11)            $ 127,024   $  41,788   $  17,446
      Net proceeds from issuance of
        long-term obligations               168,850     187,846           -
      Proceeds from issuance of notes
        payable to parent company (Note 7)  110,000      15,000           -
      Repayment of notes payable to
        parent company (Note 7)             (95,000)    (15,000)          -
      Repayment of long-term
        obligations, net                     (5,133)     (1,373)     (7,948)
                                          ---------   ---------   ---------
    Net cash provided by financing
      activities                            305,741     228,261       9,498
                                          ---------   ---------   ---------
    Exchange Rate Effect on Cash             (1,988)      1,050         405
                                          ---------   ---------   ---------
    Increase (Decrease) in Cash and
      Cash Equivalents                      127,455     242,300     (24,509)
    Cash and Cash Equivalents at
      Beginning of Year                     395,233     152,933     177,442
                                          ---------   ---------   ---------
    Cash and Cash Equivalents at
      End of Year                         $ 522,688   $ 395,233   $ 152,933
                                          =========   =========   =========
    Cash Paid For:
      Interest                            $  25,837   $  16,035   $  14,782
      Income taxes                        $  42,636   $  31,529   $  24,913

    Noncash Activities:
      Conversions of convertible
        obligations                       $  67,594   $  18,321   $  14,107

      Transfer of services businesses to
        Thermo Terra Tech joint venture   $       -   $       -   $  31,301

      Fair value of assets of 
        acquired companies                $ 487,218   $ 161,985   $ 147,696
      Cash paid for acquired companies     (258,785)    (93,004)   (100,855)
                                          ---------   ---------   ---------
        Liabilities assumed of acquired
        companies                         $ 228,433   $  68,981   $  46,841
                                          =========   =========   =========


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

                                        6PAGE
<PAGE>
    Thermo Instrument Systems Inc.                  1996 Financial Statements

               Consolidated Statement of Shareholders' Investment

    (In thousands)                              1996       1995         1994
    ------------------------------------------------------------------------
    Common Stock, $.10 Par Value
        Balance at beginning of year      $   9,257   $   4,816   $   4,708
        Issuance of stock under employees'
          and directors' stock plans              5           1           4
        Conversions of convertible 
          obligations                           505         160         104
        Effect of stock splits                    -       4,280           -
                                          ---------   ---------   ---------
        Balance at end of year                9,767       9,257       4,816
                                          ---------   ---------   ---------

    Capital in Excess of Par Value
        Balance at beginning of year        248,468     233,765     219,703
        Issuance of stock under employees'
          and directors' stock plans            950      (1,023)       (785)
        Tax benefit related to employees'
          and directors' stock plans            199       1,950       1,120
        Conversions of convertible
          obligations                        65,924      17,814      13,727
        Effect of stock splits                    -      (4,280)          -
        Effect of majority-owned
          subsidiaries' equity
          transactions                        3,923         242           -
                                          ---------   ---------   ---------
        Balance at end of year              319,464     248,468     233,765
                                          ---------   ---------   ---------

    Retained Earnings
        Balance at beginning of year        291,890     212,584     152,364
        Net income                          132,751      79,306      60,220
                                          ---------   ---------   ---------
        Balance at end of year              424,641     291,890     212,584
                                          ---------   ---------   ---------

    Treasury Stock
        Balance at beginning of year         (9,724)    (12,736)    (15,850)
        Issuance of stock under employees'
          and directors' stock plans          1,045       3,012       3,114
                                          ---------   ---------   ---------
        Balance at end of year               (8,679)     (9,724)    (12,736)
                                          ---------   ---------   ---------

    Cumulative Translation Adjustment
        Balance at beginning of year          2,814       1,991      (2,870)
        Translation adjustment               (1,754)        823       4,861
                                          ---------   ---------   ---------
        Balance at end of year            $   1,060   $   2,814   $   1,991
                                          ---------   ---------   ---------


                                        7PAGE
<PAGE>
    Thermo Instrument Systems Inc.                  1996 Financial Statements

         Consolidated Statement of Shareholders' Investment (continued)

    (In thousands)                             1996        1995         1994
    ------------------------------------------------------------------------
    Net Unrealized Gain on
      Available-for-sale
      Investments
        Balance at beginning of year      $       -   $     343   $       -
        Effect of change in accounting
          principle (Note 2)                      -           -       1,885
        Change in net unrealized gain
          on available-for-sale
          investments (Note 2)                   14        (343)     (1,542)
                                           --------   ---------   ---------
        Balance at end of year                   14           -         343
                                           --------   ---------   ---------
    Total Shareholders' Investment        $ 746,267   $ 542,705   $ 440,763
                                          =========   =========   =========


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





                                        8PAGE
<PAGE>
    Thermo Instrument Systems Inc.                  1996 Financial Statements

                   Notes to Consolidated Financial Statements

    1.  Nature of Operations and Summary of Significant Accounting Policies

    Nature of Operations
        Thermo Instrument Systems Inc. (the Company) develops, manufactures,
    and markets analytical instruments used to identify complex chemical
    compounds, toxic metals, and other elements in a broad range of liquids
    and solids, as well as instruments used to monitor radioactivity and air
    pollution, and to control, image, inspect, and measure various industrial
    processes and life-sciences phenomena.

    Relationship with Thermo Electron Corporation
        The Company was incorporated on May 28, 1986, as a wholly owned
    subsidiary of Thermo Electron Corporation (Thermo Electron). As of
    December 28, 1996, Thermo Electron owned 79,207,044 shares of the
    Company's common stock, representing 82% of such stock outstanding.

    Principles of Consolidation
        The accompanying financial statements include the accounts of the
    Company; its wholly owned subsidiaries; its majority-owned public
    subsidiaries, ThermoSpectra Corporation (ThermoSpectra), ThermoQuest
    Corporation (ThermoQuest), Thermo Optek Corporation (Thermo Optek), and
    Thermo BioAnalysis Corporation (Thermo BioAnalysis); and its
    majority-owned privately held subsidiary, Metrika Systems Corporation
    (Metrika Systems). All material intercompany accounts and transactions
    have been eliminated. The Company accounts for investments in businesses
    in which it owns between 20% and 50% using the equity method. The
    Company's ownership percentages of its majority-owned subsidiaries at
    year end were as follows:

                                                     1996      1995     1994
    ------------------------------------------------------------------------
    ThermoSpectra                                     72%       72%      86%
    ThermoQuest                                       93%      100%     100%
    Thermo Optek                                      93%      100%     100%
    Thermo BioAnalysis                                67%       80%     100%
    Metrika Systems                                   84%      100%     100%

    Fiscal Year
        The Company has adopted a fiscal year ending the Saturday nearest
    December 31. References to 1996, 1995, and 1994 are for the fiscal years
    ended December 28, 1996, December 30, 1995, and December 31, 1994,
    respectively. 

    Revenue Recognition
        The Company recognizes product revenues upon shipment of its products
    and recognizes service contract revenues ratably over the term of the
    contract. 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 primarily of unearned revenue on
    service contracts. Substantially all of the deferred revenue in the
    accompanying 1996 balance sheet will be recognized within one year.

                                        9PAGE
<PAGE>
    Thermo Instrument Systems Inc.                  1996 Financial Statements

                   Notes to Consolidated Financial Statements

    1.  Nature of Operations and Summary of Significant Accounting Policies
        (continued)
     
    Gain on Issuance of Stock by Subsidiaries
        At the time a subsidiary sells its stock to unrelated parties at a
    price in excess of its book value, the Company's net investment in that
    subsidiary increases. If at that time the subsidiary is an operating
    entity and not engaged principally in research and development, the
    Company records the increase as a gain.
        If gains have been recognized on issuances of a subsidiary's stock
    and shares of the subsidiary are subsequently repurchased either by the
    subsidiary, the Company, or Thermo Electron, gain recognition does not
    occur on issuances subsequent to the date of a repurchase until such time
    as shares have been issued in an amount equivalent to the number of
    repurchased shares. Such transactions are reflected as equity
    transactions, and the net effect of these transactions is reflected in
    the accompanying statement of shareholders' investment as "Effect of
    majority-owned subsidiaries' equity transactions."

    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 Electron have a tax allocation agreement under
    which the Company and its greater than 80%-owned subsidiaries, exclusive
    of its foreign operations, are included in Thermo Electron's consolidated
    federal and certain state income tax returns. The agreement provides that
    in years in which the Company has taxable income, it will pay to Thermo
    Electron amounts comparable to the taxes the Company would have paid if
    it had filed separate tax returns. If Thermo Electron's equity ownership
    of the Company were to drop below 80%, the Company would be required to
    file its own federal income tax return.
        In accordance with Statement of Financial Accounting Standards (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
        Primary earnings per share has been computed based on the weighted
    average number of shares outstanding during the year. Because the effect
    of the assumed exercise of stock options would be immaterial, they have
    been excluded from the primary earnings per share calculation. Fully
    diluted earnings per share has been computed assuming the conversion of
    the Company's dilutive convertible obligations and elimination of the
    related interest expense, as well as the exercise of stock options and
    their related income tax effects.

                                       10PAGE
<PAGE>
    Thermo Instrument Systems Inc.                  1996 Financial Statements

                   Notes to Consolidated Financial Statements

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

    Stock Splits
        All share and per share information was restated in 1995 to reflect a
    three-for-two stock split, effected in the form of a 50% stock dividend,
    distributed in April 1995, and a five-for-four stock split, effected in
    the form of a 25% stock dividend, distributed in December 1995.

    Cash and Cash Equivalents
        As of December 28, 1996, $459.1 million 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 U.S. government agency securities, corporate
    notes, commercial paper, money market funds, and other marketable
    securities, in the amount of at least 103% of such obligation. 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. As of December 28, 1996,
    the Company's cash equivalents also include investments in short-term
    certificates of deposit of the Company's foreign subsidiaries, which have
    an original maturity of three months or less. Cash equivalents are
    carried at cost, which approximates fair market value.

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

    (In thousands)                                           1996       1995
    ------------------------------------------------------------------------
    Raw materials and supplies                           $108,497   $ 80,959
    Work in process                                        47,518     40,851
    Finished goods                                         57,668     33,104
                                                         --------   --------
                                                         $213,683   $154,914
                                                         ========   ========

    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 40 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.
                                       11PAGE
<PAGE>
    Thermo Instrument Systems Inc.                  1996 Financial Statements

                   Notes to Consolidated Financial Statements

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

    Property, plant, and equipment consists of the following:

    (In thousands)                                           1996       1995
    ------------------------------------------------------------------------
    Land                                                 $ 31,048   $ 23,578
    Buildings                                             101,761     78,075
    Machinery, equipment, and leasehold improvements      118,167     87,432
                                                         --------   --------
                                                          250,976    189,085
    Less: Accumulated depreciation and amortization        72,313     55,408
                                                         --------   --------
                                                         $178,663   $133,677
                                                         ========   ========

    Patents and Other Assets
        Patents and other assets in the accompanying balance sheet includes
    the costs of acquired trademarks, patents, and other specifically
    identifiable intangible assets. These assets are amortized using the
    straight-line method over their estimated useful lives, which range from
    3 to 20 years. These assets were $15.5 million and $17.0 million, net of
    accumulated amortization of $16.2 million and $13.1 million, at year-end
    1996 and 1995, respectively. 

    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 $56.2 million and $38.0 million at year-end
    1996 and 1995, 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 companies in assessing the
    recoverability of this asset. If impairment has occurred, any excess of
    carrying value over fair value is recorded as a loss.

    Environmental Liabilities
        The Company accrues for costs associated with the remediation of
    environmental pollution when it is probable that a liability has been
    incurred and the Company's proportionate share of the amount can be
    reasonably estimated. Any recorded liabilities have not been discounted.

    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.

                                       12PAGE
<PAGE>
    Thermo Instrument Systems Inc.                  1996 Financial Statements

                   Notes to Consolidated Financial Statements

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

    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.

    Presentation
        Certain amounts in 1995 have been reclassified to conform to the
    presentation in the 1996 financial statements.

    2.  Available-for-sale Investments                                       

        Effective January 2, 1994, the Company adopted SFAS No. 115,
    "Accounting for Certain Investments in Debt and Equity Securities." In
    accordance with SFAS No. 115, the Company's debt and marketable equity
    securities are considered available-for-sale investments in the
    accompanying balance sheet and are carried at market value, with the
    difference between cost and market value, net of related tax effects,
    recorded currently as a component of shareholders' investment titled "Net
    unrealized gain on available-for-sale investments." Effect of change in
    accounting principle in the accompanying 1994 statement of shareholders'
    investment represents the unrealized gain, net of related tax effects,
    pertaining to available-for-sale investments held by the Company on
    January 2, 1994.
        Available-for-sale investments in the accompanying 1996 balance sheet
    represents investments in corporate bonds with contractual maturities of
    one year or less. The difference between the market value and the cost
    basis of available-for-sale investments at December 28, 1996, was
    $22,000, which represents gross unrealized gains on those investments.
        The cost of available-for-sale investments that were sold was based
    on specific identification in determining realized gains recorded in the
    accompanying statement of income. Gain on sale of related party
    investments in the accompanying statement of income resulted from gross
    realized gains relating to the sale of available-for-sale investments
    (Note 9).

    3.  Discontinued Operations

        Effective April 4, 1994, the Company formed an environmental services
    joint venture with Thermo TerraTech Inc. (Thermo TerraTech), another
    public subsidiary of Thermo Electron. The joint venture operated under
    the name Thermo Terra Tech. The Company contributed its analytical
    laboratories and its nuclear health physics and environmental science and
    engineering services businesses. Thermo TerraTech contributed its
    environmental laboratory business, which specializes in fast-response
    testing of petroleum-contaminated soils and groundwater, and
    approximately $31 million in cash and short-term investments.

                                       13PAGE
<PAGE>
    Thermo Instrument Systems Inc.                  1996 Financial Statements

                   Notes to Consolidated Financial Statements

    3.  Discontinued Operations (continued)

        Effective April 2, 1995, the Company and Thermo TerraTech dissolved
    their joint venture. Thermo TerraTech then purchased the services
    businesses formerly operated by the joint venture from the Company for  
    $34.3 million in cash, which was the net book value of the services
    businesses. The Company owned 49% of the joint venture and accounted for
    its interest in the joint venture using the equity method. Prior to the
    joint venture's formation on April 2, 1994, the Company's services
    businesses comprised its Services segment and were consolidated in the
    Company's financial statements. The sale of the services businesses to
    Thermo TerraTech represents the Company's disposal of its Services
    segment. Accordingly, the operating results of the Company's Services
    segment for the three-month period ended April 2, 1994, and the equity in
    the income of the joint venture recorded by the Company are classified as
    "Income from discontinued operations" in the accompanying statement of
    income. Revenues from the Company's Services segment for the three-month
    period ended April 2, 1994, were $12.2 million.

    4.  Acquisitions

        On March 29, 1996, the Company completed the acquisition of a
    substantial portion of the businesses comprising the Scientific
    Instruments Division of Fisons plc (Fisons), a wholly owned subsidiary of
    Rhone-Poulenc Rorer Inc., for approximately 123.5 million British pounds
    sterling in cash (approximately $188.9 million) and the assumption of
    approximately 30.8 million British pounds sterling of indebtedness
    (approximately $47.2 million). The purchase price is subject to
    post-closing adjustments equal to the amounts by which the net tangible
    assets and net debt of the acquired businesses on the closing date are
    greater or less than certain target amounts agreed to by the parties. The
    Company and Fisons are attempting to agree on the required adjustment to
    the purchase price based on their respective calculations of the net
    tangible assets of the acquired businesses. If the parties are unable to
    reach agreement, a firm of independent public accountants will be
    appointed to determine the adjustment. Any adjustment would affect the
    purchase price allocation, including the amount allocated to cost in
    excess of net assets of acquired companies. In 1996, the Company wrote
    off $3.5 million of acquired technology in connection with this
    acquisition, which represents the portion of the purchase price allocated
    to technology in development based on estimated replacement cost. The
    businesses acquired from Fisons are involved in the research,
    development, manufacture, and sale of analytical instruments to
    industrial and research laboratories worldwide.
        To finance the acquisition of a substantial portion of the businesses
    comprising the Scientific Instruments Division of Fisons, the Company
    used available cash in addition to borrowings from Thermo Electron
    (Note 7). During 1996, the Company made several other acquisitions for an
    aggregate $69.9 million in cash, subject to certain post-closing
    adjustments.
        During 1995, the Company made several acquisitions for an aggregate
    $93.0 million in cash.

                                       14PAGE
<PAGE>
    Thermo Instrument Systems Inc.                  1996 Financial Statements

                   Notes to Consolidated Financial Statements

    4.  Acquisitions (continued)

        In March 1994, the Company acquired several businesses within the
    EnviroTech Measurements & Controls group of Baker Hughes Incorporated
    (Baker Hughes) for a purchase price of $89.7 million in cash. The Company
    acquired the EnviroTech Controls, NORAN Instruments, TN Technologies, and
    Tremetrics businesses, which collectively design, manufacture, and market
    a variety of process control, process measurement, and laboratory
    analytical products for use in a wide range of industrial, energy,
    environmental, and research applications. During 1994, the Company made
    several other acquisitions for an aggregate $11.2 million in cash.
        These acquisitions have been accounted for using the purchase method
    of accounting, and their results have been included in the accompanying
    financial statements from their respective dates of acquisition. The
    aggregate cost of these acquisitions exceeded the estimated fair value of
    the acquired net assets by $350.8 million, which is being amortized over
    40 years. Allocation of the purchase price for these acquisitions was
    based on estimates of the fair value of the net assets acquired and, for
    acquisitions completed in fiscal 1996, is subject to adjustment upon
    finalization of the purchase price allocation.
        Based on unaudited data, the following table presents selected
    financial information for the Company and the businesses acquired from
    Fisons on a pro forma basis, assuming the companies 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.

    (In thousands except per share amounts)                1996         1995
    ------------------------------------------------------------------------
    Revenues                                         $1,278,824  $1,144,956
    Income from continuing operations                   112,973      45,528 
    Earnings per share from
      continuing operations:
        Primary                                            1.19         .50
        Fully diluted                                      1.09         .48

        The pro forma results are not necessarily indicative of future
    operations or the actual results that would have occurred had the
    acquisition of the businesses from Fisons been made at the beginning of
    1995.
        In connection with the acquisition of a substantial portion of the
    businesses comprising the Scientific Instruments Division of Fisons, the
    Company has undertaken a restructuring of the acquired businesses. In
    accordance with the requirements of Emerging Issues Task Force
    Pronouncement (EITF) 95-3, the Company is in the process of completing a
    plan that includes reductions in staffing levels, abandonment of excess
    facilities, and other costs associated with exiting certain activities of
    the acquired businesses. As part of the cost of the acquisition, the
    Company established reserves totaling $38.1 million for estimated
    severance, excess facilities, and other exit costs associated with the
    acquisition, $19.0 million of which was expended during 1996, primarily
    for severance. Unresolved matters at December 28, 1996, included
    completing identification of specific employees for termination and

                                       15PAGE
<PAGE>
    Thermo Instrument Systems Inc.                  1996 Financial Statements

                   Notes to Consolidated Financial Statements

    4.  Acquisitions (continued)

    locations to be abandoned or consolidated, among other decisions
    concerning the integration of the acquired businesses into the Company.
    In accordance with EITF 95-3, finalization of the Company's plan for
    restructuring the acquired businesses will not occur beyond one year from
    the date of the acquisition. Any changes in estimates of these costs
    prior to such finalization will be recorded as adjustments to cost in
    excess of net assets of acquired companies.

    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. Two of these plans, adopted in 1986, permit the
    grant of nonqualified and incentive stock options. A third plan, adopted
    in 1993, permits 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 may range 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 stock
    on the date of grant. Generally, all options have been granted at fair
    market value. The Company also has a directors' stock option plan,
    adopted in 1991, that provides for the grant of stock options in the
    Company and its majority-owned subsidiaries to outside directors pursuant
    to a formula approved by the Company's shareholders. Options in the
    Company awarded under this plan are exercisable six months after the date
    of grant and expire three or seven years after the date of grant. 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.

    Employee Stock Purchase Program
    -------------------------------
        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 this program, shares of the
    Company's and Thermo Electron's 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 
                                       16PAGE
<PAGE>
    Thermo Instrument Systems Inc.                  1996 Financial Statements

                   Notes to Consolidated Financial Statements

    5.  Employee Benefit Plans (continued)

    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 1996, 1995, and
    1994, the Company issued 49,973 shares, 74,826 shares, and 97,125 shares,
    respectively, 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 in 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)                1996        1995
    -----------------------------------------------------------------------
    Income from continuing operations:
        As reported                                    $132,751     $79,304
        Pro forma                                       129,591      79,033
    Primary earnings per share from
      continuing operations:
        As reported                                        1.40         .88
        Pro forma                                          1.36         .87
    Fully diluted earnings per share from
      continuing operations:
        As reported                                        1.27         .80
        Pro forma                                          1.25         .79

        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.
        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:

                                                          1996         1995
    -----------------------------------------------------------------------
    Volatility                                             26%          26%
    Risk-free interest rate                               6.2%         5.1%
    Expected life of options                         6.2 years    1.1 years

        The Black-Scholes option-pricing model was developed for use in
    estimating the fair value of traded options which have no vesting 

                                       17PAGE
<PAGE>
   Thermo Instrument Systems Inc.                    1996 Financial Statements

                   Notes to Consolidated Financial Statements

   5. Employee Benefit Plans (continued)

   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.

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

                              1996              1995               1994
                        ----------------  ----------------  -----------------
                                Weighted          Weighted           Range of
                        Number   Average  Number   Average  Number     Option
   (Shares                  of  Exercise      of  Exercise      of     Prices
   in thousands)        Shares     Price  Shares     Price  Shares  per Share
   --------------------------------------------------------------------------
   Options outstanding,                                              $ 2.85-
     beginning of year  3,221    $14.85    3,798   $13.94    3,552    18.02
                                                                      15.08-
       Granted            378     34.49        6    18.84      744    16.58
                                                                       2.85-
       Exercised         (204)     9.14     (375)    6.08     (353)   12.64
                                                                       2.85-
       Forfeited         (142)    15.00     (208)   14.22     (145)   16.68
                        -----              -----             -----
   Options outstanding,                                              $ 3.29-
     end of year        3,253    $17.48    3,221   $14.85    3,798    18.02
                        =====    ======    =====   ======    =====   ======
                                                                     $ 3.29-
   Options exercisable  3,253    $17.48    3,221   $14.85    3,791    18.02
                        =====    ======    =====   ======    =====   ======
   Options available
     for grant          1,526              1,764             1,564
                        =====              =====             =====
   Weighted average fair
     value per share of
     options granted
     during year                 $13.63            $ 3.72
                                 ======            ======





                                       18PAGE
<PAGE>
   Thermo Instrument Systems Inc.                  1996 Financial Statements

                   Notes to Consolidated Financial Statements

   5.  Employee Benefit Plans (continued)

       A summary of the status of the Company's stock options at December
   28, 1996, is as follows:

                                 Options Outstanding and Exercisable
                             -------------------------------------------
                                                                Weighted
                                           Weighted Average      Average
          Range of              Number            Remaining     Exercise
   Exercise Prices           of Shares     Contractual Life        Price
   ---------------------------------------------------------------------
   (Shares in thousands)
   $ 5.16 - $10.42                 328            1.9 years       $ 7.79
    10.43 -  19.14               2,547            8.2 years        16.21
    27.87 -  36.58                 378            9.7 years        34.49
                                 -----

   $ 5.16 - $36.58               3,253            7.7 years       $17.48
                                 =====

   401(k) Savings Plans and Employee Stock Ownership Plan
       The majority of the Company's full-time U.S. employees are eligible
   to participate in Thermo Electron's 401(k) savings plan and, prior to
   1995, certain of the Company's employees were eligible to participate in
   Thermo Electron's employee stock ownership plan (ESOP). In addition,
   certain of the Company's employees are eligible to participate in 401(k)
   savings plans sponsored by the Company's Nicolet Instrument Corporation
   and Finnigan Corporation subsidiaries. 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 $4.9 million,
   $3.9 million, and $3.9 million in 1996, 1995, and 1994, respectively.
   Effective December 31, 1994, the ESOP was split into two plans: ESOP I,
   covering employees of Thermo Electron's corporate office and its wholly
   owned subsidiaries and ESOP II, covering employees of certain of Thermo
   Electron's majority-owned subsidiaries, including the Company. Also,
   effective December 31, 1994, the ESOP II plan was terminated, and as a
   result, the Company's employees are no longer eligible to participate in
   an ESOP. 

   6.  Income Taxes

       The components of income from continuing operations before provision
   for income taxes and minority interest expense are as follows:

   (In thousands)                                1996       1995       1994
   ------------------------------------------------------------------------
   Domestic                                  $143,377   $ 95,999   $ 77,840
   Foreign                                     46,546     27,342     18,040
                                             --------   --------   --------
                                             $189,923   $123,341   $ 95,880
                                             ========   ========   ========

                                       19PAGE
<PAGE>
   Thermo Instrument Systems Inc.                  1996 Financial Statements

                   Notes to Consolidated Financial Statements

   6.  Income Taxes (continued)

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

   (In thousands)                                1996       1995       1994
   ------------------------------------------------------------------------
   Currently payable:
     Federal                                 $ 29,593   $ 29,336   $ 17,682
     State                                      6,978      5,766      5,499
     Foreign                                   27,100     11,490      7,977
                                             --------   --------   --------
                                               63,671     46,592     31,158
                                             --------   --------   --------
   Net deferred (prepaid):
     Federal                                   (5,553)    (3,628)     5,480
     State                                     (1,178)      (769)     1,207
     Foreign                                   (5,213)       518       (338)
                                             --------   --------   --------
                                              (11,944)    (3,879)     6,349
                                             --------   --------   --------
                                             $ 51,727   $ 42,713   $ 37,507
                                             ========   ========   ========

       The Company and its majority-owned subsidiaries receive 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 $2.0 million, $2.1
   million, and $1.1 million of such benefits of the Company and its
   majority-owned subsidiaries that have been allocated to capital in excess
   of par value, directly or through the effect of majority-owned
   subsidiaries' equity transactions, in 1996, 1995, and 1994, respectively.
   The provision for income taxes that is currently payable does not reflect
   $4.7 million and $3.0 million of tax benefits used to reduce cost in
   excess of net assets of acquired companies in 1996 and 1995,
   respectively. The deferred provision for income taxes does not reflect
   $3.4 million of tax benefits used to reduce cost in excess of net assets
   of acquired companies in 1995.



                                       20PAGE
<PAGE>
   Thermo Instrument Systems Inc.                  1996 Financial Statements

                   Notes to Consolidated Financial Statements

   6.  Income Taxes (continued)

       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 35% to income from continuing operations
   before provision for income taxes and minority interest expense due to
   the following:

   (In thousands)                                1996       1995       1994
   ------------------------------------------------------------------------
   Provision for income taxes at
     statutory rate                          $ 66,473   $ 43,169   $ 33,558
   Increases (decreases) resulting from:
     Gain on issuance of stock by
       subsidiaries                           (25,100)    (7,045)    (2,264)
     Net foreign losses not benefited and
       tax rate differential                    5,596      2,438        817
     State income taxes, net of federal tax     3,770      3,248      4,359
     Amortization of cost in excess of
       net assets of acquired companies         2,445      2,432      2,089
     Tax benefit of foreign sales
       corporation                             (2,102)    (1,987)    (1,602)
     Other, net                                   645        458        550
                                             --------   --------   --------
                                             $ 51,727   $ 42,713   $ 37,507
                                             ========   ========   ========

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

   (In thousands)                                1996       1995
   -------------------------------------------------------------
   Prepaid income taxes:
     Tax loss carryforwards                  $ 64,902   $ 22,549
     Reserves and accruals                     38,929     12,165
     Inventory basis difference                11,895      9,553
     Accrued compensation                       5,064      4,439
     Allowance for doubtful accounts            2,399      1,454
     Other, net                                     9      3,622
                                             --------   --------
                                              123,198     53,782
     Less: Valuation allowance                 64,902     22,549
                                             --------   --------
                                             $ 58,296   $ 31,233
                                             ========   ========
   Deferred income taxes:
     Depreciation                            $ 16,476   $ 14,039
     Intangible assets                          4,234      5,130
     Other                                          -        999
                                             --------   --------
                                             $ 20,710   $ 20,168
                                             ========   ========


                                       21PAGE
<PAGE>
   Thermo Instrument Systems Inc.                  1996 Financial Statements

                   Notes to Consolidated Financial Statements

   6.  Income Taxes (continued)

       The valuation allowance relates to uncertainty surrounding the
   realization of certain tax assets, including in 1996 $150.0 million of
   foreign tax loss carryforwards, $1.4 million of certain state
   tax-deferred assets, and $6.4 million of federal tax loss carryforwards,
   the realization of which is limited to the future income of certain
   subsidiaries. Of the $150.0 million of foreign tax loss carryforwards,
   $45 million expire from 1997 through 2004 and the remainder do not
   expire. The federal tax loss carryforwards expire from 2008 through 2010.
   Any tax benefit resulting from the use of the loss carryforwards will
   first be used to reduce cost in excess of net assets of acquired
   companies. The increase in the valuation allowance results primarily from
   valuation allowances established for tax loss carryforwards of businesses
   acquired in 1996.
       The Company has not recognized a deferred tax liability for the
   difference between the book basis and tax basis of its investment in the
   common stock of its domestic subsidiaries (such difference relates
   primarily to unremitted earnings and gains on issuance of stock by
   subsidiaries) because the Company does not expect this basis difference
   to become subject to tax at the parent level. The Company believes it can
   implement certain tax strategies to recover its investment in its
   domestic subsidiaries tax-free.
       A provision has not been made for U.S. or additional foreign taxes on
   $105 million 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.
   The Company believes that any additional U.S. tax liability due upon
   remittance of such earnings would be immaterial due to available U.S.
   foreign tax credits.

   7.  Short- and Long-term Obligations

   Short-term Obligations
       Notes payable in the accompanying balance sheet represents bank
   borrowings at several of the Company's foreign subsidiaries. The weighted
   average interest rate for these borrowings was 5.25% and 4.27% at
   year-end 1996 and 1995, respectively.
       To finance the acquisition of a substantial portion of the businesses
   comprising the Scientific Instruments Division of Fisons (Note 4), the
   Company used available cash in addition to borrowings of $89.0 million
   from Thermo Electron. In April 1996, the Company repaid a portion of the
   borrowings from Thermo Electron and issued a $65.0 million promissory
   note for the remaining indebtedness, which was repaid in October 1996. 
       To partially finance the acquisition of the DYNEX Technologies
   (DYNEX; formerly Dynatech Laboratories Worldwide) division of Dynatech
   Corporation in February 1996, Thermo BioAnalysis borrowed $30.0 million
   from Thermo Electron pursuant to a promissory note, which was repaid in
   July 1996.
       To partially finance the acquisition of Gould Instrument Systems,
   Inc. (GIS) in May 1995, ThermoSpectra borrowed $15.0 million from Thermo
   Electron pursuant to a promissory note, which was repaid in August 1995.

                                       22PAGE
<PAGE>
   Thermo Instrument Systems Inc.                  1996 Financial Statements

                   Notes to Consolidated Financial Statements

   7.  Short- and Long-term Obligations (continued)

   Long-term Obligations
       Long-term obligations of the Company are as follows:

   (In thousands except per share amounts)                 1996        1995
   ------------------------------------------------------------------------
   3 3/4% Senior convertible note, due 2000,
     convertible at $16.93 per share (a)               $140,000    $140,000
   3 3/4% Senior convertible debentures, due 2000,
     convertible at $16.93 per share (b)                 22,281      67,600
   4 1/2% Senior convertible debentures, due 2003,
     convertible at $43.07 per share (b)                172,500           -
   6 5/8% Subordinated convertible debentures,
     due 2001, convertible at $9.38 per share (c)             -      22,275
   5% Subordinated convertible debentures, due 2000,
     convertible into shares of ThermoQuest
     at $16.50 per share (c)                             96,250      96,250
   5% Subordinated convertible debentures, due 2000,
     convertible into shares of Thermo Optek
     at $14.85 per share (c)                             96,250      96,250
   10.23% Mortgage loan secured by property with
     a net book value of $16,042, payable in monthly
     installments with final payments in 2004             9,267      10,101
   Promissory note to parent company from
     ThermoSpectra, due 1998 (d)                         15,000           -
   Other                                                  4,788      10,885
                                                       --------    --------
                                                        556,336     443,361
   Less: Current maturities of long-term obligations      2,122       2,327
                                                       --------    --------
                                                       $554,214    $441,034
                                                       ========    ========
   (a) Represents an obligation to Thermo Electron.
   (b) Guaranteed on a senior basis by Thermo Electron.
   (c) Guaranteed on a subordinated basis by Thermo Electron.
   (d) Bears interest at the 90-day Commercial Paper Composite Rate plus 25
       basis points.

       The $96.3 million principal amount 5% subordinated convertible
   debentures of ThermoQuest and Thermo Optek are guaranteed on a
   subordinated basis by Thermo Electron. The Company has agreed to
   reimburse Thermo Electron in the event Thermo Electron is required to
   make a payment under the guarantee.
       In lieu of issuing all or a portion of the Company's common stock
   upon conversion of the 3 3/4% senior convertible debentures due 2000, the
   Company has the option to pay holders of the debentures cash equal to the
   weighted-average market price of the Company's common stock on the
   trading date prior to conversion.
       In lieu of issuing all or a portion of the Company's common stock
   upon conversion of the 4 1/2% senior convertible debentures due 2003, the
   Company has the option to deliver shares of Thermo Electron common stock 

                                       23PAGE
<PAGE>
   Thermo Instrument Systems Inc.                  1996 Financial Statements

                   Notes to Consolidated Financial Statements

   7.  Short- and Long-term Obligations (continued)

   with an aggregate value equal to the market value of the Company's common
   stock otherwise issuable upon such conversion. Thermo Electron has agreed
   to sell at market prices such number of shares of its common stock to the
   Company as the Company may require to exercise such option.
       During 1996, 1995, and 1994, convertible obligations of $67.6
   million, $18.3 million, and $14.1 million, respectively, were converted
   into common stock of the Company.
       The annual requirements for long-term obligations as of December 28,
   1996, are: $2.1 million in 1997; $16.2 million in 1998; $1.2 million in
   1999; $356.1 million in 2000; $1.4 million in 2001; and $179.3 million in
   2002 and thereafter. Total future requirements of long-term obligations
   are $556.3 million.
       See Note 12 for the fair value information pertaining to the
   Company's long-term obligations.

   8.  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 $21.1 million, $11.1
   million, and $9.0 million in 1996, 1995, and 1994, respectively. Future
   minimum payments due under noncancellable operating leases at December
   28, 1996, are: $15.5 million in 1997; $12.6 million in 1998; $10.1
   million in 1999; $8.7 million in 2000; $7.5 million in 2001; and $29.5
   million in 2002 and thereafter. Total future minimum lease payments are
   $83.9 million.

   Contingencies
       In December 1996, five employees of the Company's Epsilon Industrial,
   Inc. (Epsilon) subsidiary commenced an arbitration proceeding alleging
   that Epsilon, the Company, and certain affiliates of the Company breached
   the terms of certain agreements entered into with such employees at the
   time that a predecessor of Epsilon acquired the assets and business of a
   company formerly owned by such employees. The employees are claiming
   damages of $36 million resulting from the alleged failure of the Company
   and its affiliates to use best efforts to develop and promote certain
   products acquired at that time. The Company believes that it has
   meritorious defenses to the claim and intends to contest the matter
   vigorously. However, due to the inherent uncertainty of dispute
   resolution, the Company cannot predict the outcome of this matter. In the
   opinion of management, while an unfavorable resolution of this matter
   could materially affect the Company's results of operations in a
   particular quarter or year, any such resolution would not have a material
   adverse effect on the Company's financial position.
       The Company is also contingently liable with respect to certain other
   lawsuits and matters which, in the opinion of management, will not have a
   material effect upon the financial position of the Company or its results
   of operations.

                                       24PAGE
<PAGE>
   Thermo Instrument Systems Inc.                  1996 Financial Statements

                   Notes to Consolidated Financial Statements

   9.  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 pays Thermo Electron
   annually an amount equal to 1.0% of the Company's revenues. The Company
   paid an annual fee equal to 1.20% and 1.25% of the Company's revenues in
   1995 and 1994, respectively. The annual fee is reviewed and adjusted
   annually by mutual agreement of the parties. For these services, the
   Company was charged $12.1 million, $9.4 million, and $8.3 million in
   1996, 1995, and 1994, respectively. 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
   Corporate Charter (the Thermo Electron Corporate Charter defines the
   relationship among Thermo Electron and its majority-owned subsidiaries).
   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. 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.

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

   Sale of Related Party Investments
       During 1995, the Company sold its remaining investment in 6 1/2%
   subordinated convertible debentures due 1998, which were issued by
   Thermedics Inc. (Thermedics), a majority-owned subsidiary of Thermo
   Electron. The Company sold $2.3 million principal amount of the
   Thermedics debentures in 1995 for net proceeds of $4.5 million, which
   resulted in a gain of $2.2 million. During 1994, the Company sold $4.0
   million principal amount of the Thermedics debentures for net proceeds of
   $5.9 million, which resulted in a gain of $2.0 million.

   Short- and Long-term Obligations
       See Note 7 for short- and long-term obligations of the Company held
   by Thermo Electron.

   10.  Common Stock

       At December 28, 1996, the Company had reserved 16,945,293 unissued
   shares of its common stock for possible issuance under stock-based
   compensation plans and for issuance upon possible conversion of the
   Company's convertible obligations.

                                       25PAGE
<PAGE>
   Thermo Instrument Systems Inc.                  1996 Financial Statements

                   Notes to Consolidated Financial Statements

   11.  Issuance of Stock by Subsidiaries

       Gain on issuance of stock by subsidiaries in the accompanying
   statement of income results from the following transactions:

   1996
       Initial public offering of 3,450,000 shares of ThermoQuest common
   stock at $15.00 per share for net proceeds of $47.8 million resulted in a
   gain of $27.2 million.
       Initial public offering of 3,450,000 shares of Thermo Optek common
   stock at $13.50 per share for net proceeds of $42.9 million resulted in a
   gain of $25.1 million.
       Initial public offering of 1,670,000 shares of Thermo BioAnalysis
   common stock at $14.00 per share for net proceeds of $20.8 million
   resulted in a gain of $9.8 million.
        Private placement of 1,935,667 shares of Metrika Systems common
   stock at $7.50 per share for net proceeds of $13.5 million resulted in a
   gain of $9.6 million.

   1995
       Private placement of 1,601,500 shares of Thermo BioAnalysis common
   stock at $10.00 per share for net proceeds of $14.9 million resulted in a
   gain of $9.5 million.
       Initial public offering of 1,725,000 shares of ThermoSpectra common
   stock at $14.00 per share for net proceeds of $21.9 million resulted in a
   gain of $9.3 million.
       Private placement of 202,000 shares of ThermoSpectra common stock at
   $15.72 per share for net proceeds of $3.0 million resulted in a gain of
   $1.3 million.

   1994
       Private placement of 1,505,000 shares of ThermoSpectra common stock
   at $10.00 per share for net proceeds of $14.0 million resulted in a gain
   of $6.5 million.

   12.  Fair Value of Financial Instruments

       The Company's financial instruments consist primarily of cash and
   cash equivalents, available-for-sale investments, accounts receivable,
   notes payable, accounts payable, due to parent company, long-term
   obligations, and forward exchange contracts. The carrying amounts of
   these financial instruments, with the exception of available-for-sale
   investments, long-term obligations, and forward exchange contracts,
   approximate fair value due to their short-term nature.
       Available-for-sale investments are carried at fair value in the
   accompanying 1996 balance sheet. The fair values were determined based on
   quoted market prices (Note 2).
        The Company enters into forward exchange contracts to hedge certain
   firm purchase and sale commitments denominated in currencies other than
   its subsidiaries' local currencies, principally U.S. dollars, British
   pounds sterling, French francs, German deutsche marks, and Japanese yen.
   The purpose of the Company's foreign currency hedging activities is to
   protect the Company's local currency cash flows related to these

                                       26PAGE
<PAGE>
   Thermo Instrument Systems Inc.                  1996 Financial Statements

                   Notes to Consolidated Financial Statements

   12.  Fair Value of Financial Instruments (continued)

   commitments from fluctuations in foreign exchange rates. The amounts of
   such forward exchange contracts at year-end 1996 and 1995 were $12.8
   million and $12.2 million, respectively.
       The carrying amount and fair value of the Company's long-term
   obligations and off-balance-sheet financial instruments are as follows:

                                         1996                 1995
                                  ------------------   ------------------
                                  Carrying      Fair   Carrying      Fair
   (In thousands)                   Amount     Value     Amount     Value
   ----------------------------------------------------------------------
   Long-term obligations:
       Convertible obligations    $527,281  $681,550   $422,375  $595,482
       Other long-term
         obligations                26,933    27,767     18,659    19,122
                                  --------  --------   --------  --------

                                  $554,214  $709,317   $441,034  $614,604
                                  ========  ========   ========  ========

   Off-balance-sheet
     financial instruments:
       Forward exchange
         contracts receivable               $    886             $    462

       The fair value of long-term obligations was determined based on
   quoted market prices and on borrowing rates available to the Company at
   the respective year-ends. The fair value of the Company's convertible
   obligations exceeds the carrying amount primarily due to the market price
   of the Company's common stock at the respective year-ends exceeding the
   conversion price of certain of the convertible obligations.
       The fair value of forward exchange contracts is the estimated amount
   that the Company would receive if it were to terminate the contracts,
   taking into account the change in foreign exchange rates.




                                       27PAGE
<PAGE>
   Thermo Instrument Systems Inc.                  1996 Financial Statements

                   Notes to Consolidated Financial Statements

   13.  Geographical Data

        The Company is engaged in one business segment: developing,
   manufacturing, and marketing analytical, monitoring, process control, and
   imaging, inspection, and measurement instruments. The following table
   shows data for the Company by geographical area:

   (In thousands)                            1996        1995          1994
   ------------------------------------------------------------------------
   Revenues:
       United States                   $  688,865   $  520,485   $  457,121
       United Kingdom                     227,375       78,768       57,752
       Germany                            182,958      124,035       96,338
       Other Europe                       225,244      107,755       72,633
       Other                              104,885       79,368       59,663
       Transfers among geographical
         areas (a)                       (219,965)    (127,749)     (93,515)
                                       ----------   ----------   ----------
                                       $1,209,362   $  782,662   $  649,992
                                       ==========   ==========   ==========

   Income from continuing operations
     before provision for income taxes
     and minority interest expense:
       United States                   $   97,114   $   81,144   $   86,189
       United Kingdom                      14,333        5,128        3,569
       Germany                              9,894        8,703        3,168
       Other Europe                        15,350       12,505        6,823
       Other                               11,500        8,203        7,490
       Corporate and eliminations (b)     (21,548)     (11,214)     (10,002)
                                       ----------   ----------   ----------
       Total operating income             126,643      104,469       97,237
       Interest and other income
         (expense), net                    63,280       18,872       (1,357)
                                       ----------   ----------   ----------
                                       $  189,923   $  123,341   $   95,880
                                       ==========   ==========   ==========

   Identifiable assets:
       United States                   $1,045,345   $  888,620   $  595,329
       United Kingdom                     253,203       85,615       46,959
       Germany                            172,468      125,686      114,536
       Other Europe                       221,420       94,135       53,664
       Other                               57,435       62,090       37,947
       Corporate and eliminations (c)     174,529      116,667      163,482
                                       ----------   ----------   ----------
                                       $1,924,400   $1,372,813   $1,011,917
                                       ==========   ==========   ==========


                                       28PAGE
<PAGE>
   Thermo Instrument Systems Inc.                  1996 Financial Statements

                   Notes to Consolidated Financial Statements

   13.  Geographical Data (continued)


   (In thousands)                            1996        1995          1994
   ------------------------------------------------------------------------
   Export revenues included in United
     States revenues above (d):
       Europe                          $  100,767   $   88,418   $   70,903
       Asia                               107,796       80,839       57,249
       Other                               45,142       40,303       25,412
                                       ----------   ----------   ----------
                                       $  253,705   $  209,560   $  153,564
                                       ==========   ==========   ==========

   (a) Transfers among geographical areas are accounted for at prices that
       are representative of transactions with unaffiliated parties.
   (b) Primarily corporate general and administrative expenses.
   (c) Primarily cash, cash equivalents, and available-for-sale investments.
   (d) In general, export revenues are denominated in U.S. dollars.













                                       29PAGE
<PAGE>
   Thermo Instrument Systems Inc.                  1996 Financial Statements

                   Notes to Consolidated Financial Statements

   14.  Unaudited Quarterly Information

   (In thousands except per share amounts)

   1996(a)                          First     Second(b)   Third      Fourth
   ------------------------------------------------------------------------
   Revenues                      $225,571    $321,552  $315,292    $346,947
   Gross profit                   107,364     144,524   147,803     155,506
   Net income                      34,043      35,296    30,521      32,891
   Earnings per share:
       Primary                        .37         .37       .32         .34
       Fully diluted                  .33         .34       .29         .31

   1995(c)                          First     Second      Third      Fourth
   ------------------------------------------------------------------------
   Revenues                      $172,944    $185,744  $193,899    $230,075
   Gross profit                    84,914      90,916    93,535     109,854
   Income from continuing
     operations                    16,914      18,673    21,881      21,836
   Net income                      16,916      18,673    21,881      21,836
   Earnings per share from
     continuing operations:
       Primary                        .19         .21       .24         .24 
       Fully diluted                  .17         .19       .22         .22
   Earnings per share:
       Primary                        .19         .21       .24         .24
       Fully diluted                  .17         .19       .22         .22

   (a) Results include nontaxable gains of $24.3 million, $25.5 million,
       $11.4 million, and $10.5 million in the first, second, third, and
       fourth quarters, respectively, from the issuance of stock by
       subsidiaries.
   (b) Reflects the March 29, 1996, acquisition of a substantial portion of
       the businesses comprising the Scientific Instruments Division of
       Fisons.
   (c) Results include nontaxable gains of $4.7 million, $4.8 million, $9.3
       million, and $1.3 million in the first, second, third, and fourth
       quarters, respectively, from the issuance of stock by subsidiaries.


                                       30PAGE
<PAGE>
   Thermo Instrument Systems Inc.                  1996 Financial Statements

                   Notes to Consolidated Financial Statements

   15.  Subsequent Event

        On March 12, 1997, the Company declared unconditional in all
   respects its cash tender offer for all outstanding shares of Life
   Sciences International PLC (Life Sciences) for 135 British pence per
   share (approximately $2.16 per share). As of that date, the Company had
   received acceptances representing approximately 91% of the Life Sciences
   shares outstanding and the Company owned an additional 3% of the
   outstanding Life Sciences shares. There are approximately 175 million
   Life Sciences shares outstanding. The Company has established March 26,
   1997, as the date for payment for all shares as to which acceptance had
   been received. In addition, the Company expects to repay approximately
   $72 million of Life Sciences' debt, net of acquired cash expected to be
   used. Life Sciences, a London Stock Exchange-listed company, manufactures
   laboratory science equipment, appliances, instruments, consumables, and
   reagents for the research, clinical, and industrial markets.













                                       31PAGE
<PAGE>
   Thermo Instrument Systems Inc.                  1996 Financial Statements

                    Report of Independent Public Accountants


   To the Shareholders and Board of Directors of
   Thermo Instrument Systems Inc.:

       We have audited the accompanying consolidated balance sheet of Thermo
   Instrument Systems Inc. (a Delaware corporation and 82%-owned subsidiary
   of Thermo Electron Corporation) and subsidiaries as of December 28, 1996,
   and December 30, 1995, and the related consolidated statements of income,
   shareholders' investment, and cash flows for each of the three years in
   the period ended December 28, 1996. 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
   Thermo Instrument Systems Inc. and subsidiaries as of December 28, 1996,
   and December 30, 1995, and the results of their operations and their cash
   flows for each of the three years in the period ended December 28, 1996,
   in conformity with generally accepted accounting principles.



                                              Arthur Andersen LLP



   Boston, Massachusetts
   February 11, 1997 (except with respect
   the matter discussed in Note 15 as to
   which the date is March 12, 1997)






                                       32PAGE
<PAGE>
   Thermo Instrument Systems Inc.                  1996 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
   caption "Forward-looking Statements."

   Results of Operations

       The Company's revenues were $1,209.4 million in 1996, compared with
   $782.7 million in 1995 and $650.0 million in 1994. The increases were
   primarily due to acquisitions, which included a substantial portion of
   the businesses comprising the Scientific Instruments Divisions of Fisons
   in March 1996, DYNEX in February 1996, Oriel Corporation in February
   1996, the analytical instrument division of ATI in December 1995, GIS in
   May 1995, the Analytical Instruments Division of Baird Corporation in
   January 1995, and several businesses within the EnviroTech Measurements &
   Controls group of Baker Hughes in March 1994. Acquisitions added revenues
   of $404 million in 1996 and $104 million in 1995. The remainder of the
   increase in revenues in 1996 resulted primarily from greater demand
   experienced by ThermoQuest's mass spectrometry business as a result of
   the introduction of two new products, one in the third quarter of 1995
   and another in the first quarter of 1996, and, to a lesser extent,
   greater product demand at Thermo Optek's Fourier transform infrared
   (FT-IR) and FT-Raman spectrometry businesses. The increases in 1996 were
   offset by a decrease of $21.8 million in revenues due to the unfavorable
   effects of currency translation as a result of the strengthening of the
   U.S. dollar relative to foreign currencies in countries in which the
   Company operates. The remainder of the increase in revenues in 1995 was
   substantially a result of the favorable effects of currency translation
   due to the decline in the value of the U.S. dollar relative to foreign
   currencies in countries where the Company operates. An increase in
   revenues in 1995 from certain existing businesses was offset in part by a
   decline in revenues from the Company's air monitoring instruments
   subsidiary as most orders in response to Phases I and II of the Clean Air
   Act of 1990 have been completed.
       International sales account for a significant portion of the
   Company's total revenues. Although the Company seeks to charge its
   customers in the same currency as its operating costs, the Company's
   financial performance and competitive position can be affected by
   currency exchange rate fluctuations. Where appropriate, the Company uses
   forward exchange contracts to reduce its exposure to currency
   fluctuations.

                                       33PAGE
<PAGE>
   Thermo Instrument Systems Inc.                  1996 Financial Statements

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

   Results of Operations (continued)

       The gross profit margin was 46% in 1996, compared with 48% in 1995
   and 1994. The gross profit margin decreased in 1996 primarily due to
   lower margins at acquired businesses.
       Selling, general, and administrative expenses as a percentage of
   revenues was 28% in 1996 and 1995 and 27% in 1994. Selling, general, and
   administrative expenses as a percentage of revenues increased in 1995
   from 1994 due to higher costs as a percentage of revenues at acquired
   businesses and reduced revenues from the Company's air monitoring
   instruments subsidiary as discussed above. The Company's goal is to
   continue to reduce selling, general, and administrative expenses as a
   percentage of revenues at its newly acquired businesses.
       Research and development expenses as a percentage of revenues were
   7.0% in 1996, 6.9% in 1995, and 6.6% in 1994. The increase is consistent
   with the Company's objective to develop and market new products.
       In 1996, the Company wrote off $3.5 million of acquired technology in
   connection with the acquisition of the businesses from Fisons (Note 4).
       Interest income increased to $20.5 million in 1996 from $14.6 million
   in 1995 and $5.9 million in 1994. The increase in 1996 was primarily the
   result of interest income earned on invested proceeds from the issuance
   of $96.3 million principal amount of 5% subordinated convertible
   debentures by each of ThermoQuest and Thermo Optek in August 1995 and
   October 1995, respectively, the issuance of common stock by the Company's
   subsidiaries (Note 11) and, to a lesser extent, the issuance of $172.5
   million principal amount of 4 1/2% senior convertible debentures by the
   Company in October 1996. The increase in interest income in 1996 was
   offset in part by a reduction in cash as a result of acquisitions. The
   increase in interest income in 1995 was primarily the result of interest
   income earned on invested proceeds from the issuance of the 5%
   subordinated convertible debentures by ThermoQuest and Thermo Optek and
   higher prevailing interest rates in 1995 compared with 1994. Interest
   income also increased in 1995, to a lesser extent, as a result of
   interest income earned on invested proceeds from the issuance of common
   stock by the Company's subsidiaries in the first three quarters of 1995
   and the third and fourth quarters of 1994 (Note 11). The increase in
   interest income in 1995 was offset in part by a reduction in cash as a
   result of acquisitions.
       Interest expense increased to $28.9 million in 1996 from $18.1
   million in 1995 and $15.8 million in 1994. The increase in interest
   expense in 1996 was primarily due to the issuance of the 5% subordinated
   convertible debentures by ThermoQuest and Thermo Optek. To a lesser
   extent, interest expense increased due to the issuance by the Company of
   the 4 1/2% senior convertible debentures, the issuance of promissory
   notes to Thermo Electron in connection with acquisitions (Note 7), and
   the inclusion of interest expense on the debt assumed as part of the
   Fisons acquisition. The increases in 1996 were offset in part by the
   conversion of a portion of the Company's convertible obligations into
   common stock of the Company. The increase in interest expense in 1995 was
   primarily due to the issuance of the 5% subordinated convertible
   debentures by ThermoQuest and Thermo Optek, offset in part by the 

                                       34PAGE
<PAGE>
   Thermo Instrument Systems Inc.                  1996 Financial Statements

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

   Results of Operations (continued)

   conversion of a portion of the Company's convertible obligations into
   common stock of the Company.
       The Company has adopted a strategy of spinning out certain of its
   businesses into separate subsidiaries and having these subsidiaries sell
   a minority interest to outside investors. The Company believes that this
   strategy provides additional motivation and incentives for the management
   of the subsidiaries through the establishment of subsidiary-level stock
   option incentive programs, as well as capital to support the
   subsidiaries' growth. As a result of the sale of stock by subsidiaries,
   the Company recorded gains of $71.7 million in 1996, $20.1 million in
   1995, and $6.5 million in 1994 (Note 11). These gains represent an
   increase in the Company's proportionate share of the subsidiary's equity
   and are classified as "Gain on issuance of stock by subsidiaries" in the
   accompanying statement of income. The size and timing of these
   transactions are dependent on market and other conditions that are beyond
   the Company's control. In addition, in October 1995, the Financial
   Accounting Standards Board (FASB) issued an exposure draft of a Proposed
   Statement of Financial Accounting Standards, "Consolidated Financial
   Statements: Policy and Procedures" (the Proposed Statement). The Proposed
   Statement would establish new rules for how consolidated financial
   statements should be prepared. If the Proposed Statement is adopted,
   there could be significant changes in the way the Company records certain
   transactions of its controlled subsidiaries. Among those changes, any
   sale of the stock of a subsidiary that does not result in a loss of
   control would be accounted for as a transaction in equity of the
   consolidated entity with no gain or loss being recorded. The FASB expects
   to issue a final statement or a revised exposure draft in 1997.
   Accordingly, there can be no assurance that the Company will be able to
   realize gains from such transactions in the future.
       The Company recorded gains of $2.2 million and $2.0 million in 1995
   and 1994, respectively, from the sale of the Company's investment in
   Thermedics Inc. subordinated convertible debentures (Note 9). Thermedics
   Inc. is a majority-owned subsidiary of Thermo Electron.
       The effective tax rate was 27% in 1996, 35% in 1995, and 39% in 1994.
   The effective tax rate decreased in 1996 and 1995 primarily due to a
   higher nontaxable gain on issuance of stock by subsidiaries. Excluding
   the impact of the gain on issuance of stock by subsidiaries, the
   effective tax rates exceeded the statutory federal income tax rate due to
   the inability to provide a tax benefit on losses incurred at certain
   foreign subsidiaries, the impact of foreign and state income taxes, the
   nondeductible amortization of cost in excess of net assets of acquired
   companies, and the write-off of acquired technology in connection with
   the acquisition of the businesses from Fisons in March 1996.
       Effective April 2, 1995, the Company and Thermo TerraTech dissolved
   their Thermo Terra Tech joint venture. Thermo TerraTech then purchased
   the services businesses formerly operated by the joint venture from the
   Company. Prior to the joint venture's formation on April 2, 1994, the
   Company's services businesses comprised its Services segment and were
   consolidated in the Company's financial statements. The sale of the 

                                       35PAGE
<PAGE>
   Thermo Instrument Systems Inc.                  1996 Financial Statements

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

   Results of Operations (continued)

   businesses to Thermo TerraTech represents the Company's disposal of its
   Services segment (Note 3).
       See Note 8 for a description of an arbitration proceeding involving
   the Company.

   Liquidity and Capital Resources

       Consolidated working capital was $636.7 million at December 28, 1996,
   compared with $489.9 million at December 30, 1995, an increase of $146.8
   million. Included in working capital are cash, cash equivalents, and
   available-for-sale investments of $530.1 million at December 28, 1996,
   and $395.2 million at December 30, 1995. Of the $530.1 million balance at
   December 28, 1996, $16.6 million was held by ThermoSpectra, $182.4
   million by ThermoQuest, $63.6 million by Thermo Optek, $45.5 million by
   Thermo BioAnalysis, $20.2 million by Metrika Systems, and $201.8 million
   by the Company and its wholly owned subsidiaries. Cash provided by
   operations in 1996 was $93.1 million. Inventories decreased $14.2 million
   primarily due to improved inventory management at certain subsidiaries.
   Other current liabilities decreased $37.5 million primarily due to
   restructuring expenditures at businesses acquired by the Company in 1996.
       At December 28, 1996, $59.2 million of the Company's cash and cash
   equivalents was held by its foreign subsidiaries. Repatriation of this
   cash into the United States would be subject to foreign withholding taxes
   and could also be subject to a United States tax.
       The Company's investing activities used $269.4 million of cash in
   1996. During 1996, the Company expended $248.2 million, net of cash
   acquired, for acquisitions (Note 4) and $19.1 million for the purchase of
   property, plant, and equipment. 
       The Company's financing activities provided $305.7 million of cash in
   1996. During 1996, ThermoQuest, Thermo Optek, Thermo BioAnalysis, and
   Metrika Systems sold shares of their common stock for aggregate net
   proceeds of $125.0 million (Note 11). During 1996, the Company issued
   $110.0 million and repaid $95.0 million of notes payable to Thermo
   Electron in connection with acquisitions (Note 7). In October 1996, the
   Company issued and sold $172.5 million principal amount of 4 1/2% senior
   convertible debentures for net proceeds of $168.9 million (Note 7).
       In 1997, the Company plans to make expenditures of approximately $21
   million for property, plant, and equipment. The Company believes that its
   existing resources are sufficient to meet the capital requirements of its
   existing operations for the foreseeable future. 
       The Company has historically complemented internal development with
   acquisitions of businesses or technologies that extend the Company's
   presence in current markets or provide opportunities to enter and compete
   effectively in new markets. The Company will consider making acquisitions
   of such businesses or technologies that are consistent with its plans for
   strategic growth. The Company expects that it will finance these
   acquisitions through a combination of internal funds, additional debt or
   equity financing from the capital markets, or short-term borrowings from
   Thermo Electron. On March 12, 1997, the Company declared unconditional in
   all respects its cash tender offer for all outstanding shares of Life

                                       36PAGE
<PAGE>
   Thermo Instrument Systems Inc.                  1996 Financial Statements

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

   Liquidity and Capital Resources (continued)

   Sciences for 135 British pence per share (approximately $2.16 per share),
   or approximately $378 million. As of that date, the Company had received
   acceptances representing approximately 91% of the Life Sciences shares
   outstanding and the Company owned an additional 3% of the outstanding
   Life Sciences shares. The Company has established March 26, 1997, as the
   date for payment for all shares as to which acceptance had been received.
   In addition, the Company expects to repay approximately $72 million of
   Life Sciences' debt, net of acquired cash expected to be used (Note 15).













                                       37PAGE
<PAGE>
    Thermo Instrument Systems Inc.                  1996 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 1997 and beyond to differ
    materially from those expressed in any forward-looking statements made
    by, or on behalf of, the Company.
        Risks Associated with Spinout of Subsidiaries. The Company has
    adopted a strategy of spinning out certain of its businesses into
    separate subsidiaries and having these subsidiaries sell a minority
    interest to outside investors. As a result of the sale of stock by
    subsidiaries, the issuance of stock by subsidiaries upon conversion of
    convertible debentures, and similar transactions, the Company records
    gains that represent the increase in the Company's net investment in the
    subsidiaries. These gains have represented a substantial portion of the
    net income reported by the Company in certain periods. The size and
    timing of these transactions are dependent on market and other conditions
    that are beyond the Company's control. Accordingly, there can be no
    assurance that the Company will be able to generate gains from such
    transactions in the future.
        In addition, in October 1995, the Financial Accounting Standards
    Board (FASB) issued an exposure draft of a Proposed Statement of
    Financial Accounting Standards, "Consolidated Financial Statements:
    Policy and Procedures" (the Proposed Statement). The Proposed Statement
    would establish new rules for how consolidated financial statements
    should be prepared. If the Proposed Statement is adopted, there could be
    significant changes in the way the Company records certain transactions
    of its controlled subsidiaries. Among those changes, any sale of the
    stock of a subsidiary that does not result in a loss of control would be
    accounted for as a transaction in equity of the consolidated entity with
    no gain or loss being recorded. The FASB expects to issue a final
    statement or a revised exposure draft in 1997.
        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.
        Risks Associated with Acquisition Strategy. One of the Company's
    growth strategies is to supplement its internal growth with the
    acquisition of businesses and technologies that complement or augment the
    Company's existing product lines. Certain businesses acquired by the
    Company within the past year, including businesses within the former
    analytical instrument division of Analytical Technology, Inc. and the
    former Scientific Instruments Division of Fisons plc, have had low levels
    of profitability. In addition, businesses that the Company may seek to
    acquire in the future may also be marginally profitable or unprofitable.
    In order for any acquired businesses to achieve the level of
    profitability desired by the Company, the Company must successfully

                                       38PAGE
<PAGE>
    Thermo Instrument Systems Inc.                  1996 Financial Statements

                           Forward-looking Statements

    change operations and improve market penetration. No assurance can be
    given that the Company will be successful in this regard. In addition,
    promising acquisitions are difficult to identify and complete for a
    number of reasons, including competition among prospective buyers, the
    need for regulatory approvals, including antitrust approvals, and the
    high valuations of businesses resulting from historically high stock
    prices in many countries. There can be no assurance that the Company will
    be able to complete pending or future acquisitions. In order to finance
    any such acquisitions, 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 which are not
    favorable to the Company and may result in dilution to the Company's
    shareholders.
        Risks Associated with Technological Change, Obsolescence, and the
    Development and Acceptance of New Products. The market for the Company's
    products and services is characterized by rapid and significant
    technological change and evolving industry standards. New product
    introductions responsive to these factors require significant planning,
    design, development, and testing at the technological, product, and
    manufacturing process levels, and may render existing products and
    technologies uncompetitive or obsolete. There can be no assurance that
    the Company's products will not become uncompetitive or obsolete. In
    addition, industry acceptance of new technologies developed by the
    Company may be slow to develop due to, among other things, existing
    regulations written specifically for older technologies and general
    unfamiliarity of users with new technologies.
        Possible Adverse Effect From Consolidation in the Environmental
    Market and Changes in Environmental Regulations. One of the important
    markets for the Company's products is environmental analysis. During the
    past three years, there has been a contraction in the market for
    analytical instruments used for environmental analysis. This contraction
    has caused consolidation in the businesses serving this market. Such
    consolidation may have an adverse impact on certain of the Company's
    businesses. In addition, most air, water, and soil analysis is conducted
    to comply with federal, state, local, and foreign environmental
    regulations. These regulations are frequently specific as to the type of
    technology required for a particular analysis and the level of detection
    required for that analysis. The Company develops, configures, and markets
    its products to meet customer needs created by existing and anticipated
    environmental regulations. These regulations may be amended or eliminated
    in response to new scientific evidence or political or economic
    considerations. Any significant change in environmental regulations could
    result in a reduction in demand for the Company's products.
        Risks Associated With the Sale of Products to the Pharmaceutical
    Industry. The pharmaceutical industry is one of the important markets for
    the Company's products. Although the Company's existing general purpose
    analytical equipment and services are not subject to regulation by the
    U.S. Food and Drug Administration (the FDA), FDA regulations apply to the
    processes and production facilities used to manufacture pharmaceutical
    products. Any material change by a pharmaceutical company in its
    manufacturing process or equipment could necessitate additional FDA
    review and approval. Such requirements may make it more difficult for the
    Company to sell its products and services to pharmaceutical customers 

                                       39PAGE
<PAGE>
    Thermo Instrument Systems Inc.                  1996 Financial Statements

                           Forward-looking Statements

    that have already applied for or obtained approval for production
    processes using different equipment and supplies. Any changes in the
    regulations that apply to the processes and production facilities used to
    manufacture pharmaceutical products may adversely affect the market for
    the Company's products. In addition, from time to time as a result of
    industry consolidation and other factors, the pharmaceutical industry has
    reduced its capital expenditures for equipment such as that manufactured
    by the Company, and there can be no assurance that further changes in the
    pharmaceutical industry will not adversely affect demand for the
    Company's products.
        Risks Associated With Dependence on Capital Spending Policies and
    Government Funding. The Company's customers include pharmaceutical and
    chemical companies, laboratories, government agencies, and public and
    private research institutions. The capital spending of these entities can
    have a significant effect on the demand for the Company's products. Such
    spending levels are based on a wide variety of factors, including the
    resources available to make such purchases, the spending priorities among
    various types of research equipment, public policy, and the effects of
    different economic cycles. Any decrease in capital spending by any of the
    customer groups that account for a significant portion of the Company's
    sales could have a material adverse effect on the Company's business and
    results of operations.
        Possible Adverse Impact of Significant International Operations.
    International sales accounted for a significant portion of the Company's
    total revenues in 1996, and the Company expects that international sales
    will continue to account for a significant portion of the Company's
    revenues in the future. Sales to customers in foreign countries are
    subject to a number of risks, including the following: fluctuations in
    exchange rates may affect product demand and adversely affect the
    profitability in U.S. dollars of products and services provided by the
    Company in foreign markets where payment for the Company's products and
    services is made in the local currency; agreements may be difficult to
    enforce and receivables difficult to collect through a foreign country's
    legal system; foreign customers may have longer payment cycles; foreign
    countries could impose withholding taxes or otherwise tax the Company's
    foreign income, impose tariffs, or adopt other restrictions on foreign
    trade; export licenses, if required, may be difficult to obtain and the
    protection of intellectual property in foreign countries may be more
    difficult to enforce. There can be no assurance that any of these factors
    will not have a material adverse effect on the Company's business and
    results of operations.
        Competition. The Company encounters and expects to continue to
    encounter intense competition in the sale of its products. The Company
    believes that the principal competitive factors affecting the market for
    its products include product performance, price, reliability, and
    customer service. The Company's competitors include large multinational
    corporations and their operating units. Some of the Company's other
    competitors have substantially greater financial, marketing, and other
    resources than those of the Company. As a result, they may be able to
    adapt more quickly to new or emerging technologies and changes in
    customer requirements, or to devote greater resources to the promotion
    and sale of their products than the Company. In addition, competition
    could increase if new companies enter the market or if existing 

                                       40PAGE
<PAGE>
    Thermo Instrument Systems Inc.                  1996 Financial Statements

                           Forward-looking Statements

    competitors expand their product lines or intensify efforts within
    existing product lines. There can be no assurance that the Company's
    current products, products under development or ability to discover new
    technologies will be sufficient to enable it to compete effectively with
    its competitors.
        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 may need to acquire licenses to, or
    contest the validity of, any 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.
    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. 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.




                                       41PAGE
<PAGE>
    Thermo Instrument Systems Inc.                  1996 Financial Statements

                         Selected Financial Information

    (In thousands
    except per share
    amounts)            1996(a)    1995(b)      1994(c)    1993(d)     1992
    -----------------------------------------------------------------------

    Statement of
      Income Data:
    Revenues      $1,209,362 $  782,662  $  649,992  $  529,278  $  368,532
    Income from
      continuing
      operations     132,751     79,304      58,261      42,793      31,666
    Net income       132,751     79,306      60,220      44,764      33,130
    Earnings per
      share from
      continuing
      operations:
        Primary         1.40        .88         .66         .51         .39
        Fully diluted   1.27        .80         .61         .48         .38
    Earnings per
      share:
        Primary         1.40        .88         .68         .53         .41
        Fully diluted   1.27        .80         .63         .50         .39
     
    Balance Sheet
      Data:
    Working
      capital     $  636,703 $  489,895  $  230,306  $  238,053  $   68,412
    Total assets   1,924,400  1,372,813   1,011,917     891,141     686,425
    Long-term
      obligations    554,214    441,034     263,559     286,161     170,092
    Shareholders'
      investment     746,267    542,705     440,763     358,055     272,723

    (a)Reflects the March 1996 acquisition of a substantial portion of the
       businesses comprising the Scientific Instruments Division of Fisons
       plc, the October 1996 issuance of $172.5 million principal amount of
       4 1/2% senior convertible debentures due 2003, and nontaxable gains
       of $71.7 million from the issuance of stock by subsidiaries.
    (b)Reflects the August and October 1995 issuance of $96.3 million
       principal amount of 5% subordinated convertible debentures due 2000
       by each of ThermoQuest and Thermo Optek, respectively, and nontaxable
       gains of $20.1 million from the issuance of stock by subsidiaries.
    (c)Reflects the March 1994 acquisition of several businesses within the
       EnviroTech Measurements & Controls group of Baker Hughes Incorporated
       and nontaxable gains of $6.5 million from the issuance of stock by
       subsidiary.
    (d)Reflects the February 1993 acquisition of Spectra-Physics Analytical,
       Inc., the April 1993 sale of the biomedical instruments products
       business of the Company's Nicolet Instrument Corporation subsidiary,
       and the September 1993 issuance of $210.0 million aggregate principal
       amount of 3 3/4% senior convertible obligations due 2000.

                                       42PAGE
<PAGE>



    Thermo Instrument Systems Inc.                  1996 Financial Statements


    Common Stock Market Information
        The following table shows the market range for the Company's common
    stock based on reported sales prices on the American Stock Exchange
    (symbol THI) for 1996 and 1995. Prices were restated in 1995 to reflect a
    three-for-two stock split distributed in April 1995 and a five-for-four
    stock split distributed in December 1995.

                               1996                            1995
                      ---------------------          -----------------------
    Quarter              High           Low               High           Low
    ------------------------------------------------------------------------
    First             $30 1/2      $24 5/8           $18 13/15     $15 13/15
    Second             43 3/8       28 1/2            20  1/5       17  1/5
    Third              38 3/4       29 1/2            22  2/5       19  4/5
    Fourth             37 5/8       29                27  1/10      21  1/2

       As of January 24, 1997, the Company had 2,897 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 24, 1997, was $34 3/8 per share.
       Common stock of the Company's majority-owned public subsidiaries is
    traded on the American Stock Exchange: ThermoSpectra Corporation (symbol
    THS), ThermoQuest Corporation (symbol TMQ), Thermo Optek Corporation
    (symbol TOC), and Thermo BioAnalysis Corporation (symbol TBA).

    Shareholder Services
        Shareholders of Thermo Instrument Systems Inc. who desire information
    about the Company are invited to contact John N. Hatsopoulos, Chief
    Financial Officer, Thermo Instrument Systems Inc., 81 Wyman Street, P.O.
    Box 9046, Waltham, Massachusetts 02254-9046, (617) 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. Beginning in
    1997, quarterly distribution will be limited to the second quarter only.
    All quarterly reports and press releases are available through the
    Internet from Thermo Electron's home page on the World Wide Web
    (http://www.thermo.com/subsid/thi.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


                                       43PAGE
<PAGE>
    Thermo Instrument Systems Inc.                  1996 Financial Statements


    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.

    Form 10-K Report
        A copy of the Annual Report on Form 10-K for the fiscal year ended
    December 28, 1996, as filed with the Securities and Exchange Commission,
    may be obtained at no charge by writing to John N. Hatsopoulos, Chief
    Financial Officer, Thermo Instrument Systems Inc., 81 Wyman Street, P.O.
    Box 9046, Waltham, Massachusetts 02254-9046.

    Annual Meeting
        The annual meeting of shareholders will be held on Monday, June 2,
    1997, at 10:00 a.m., at the Hyatt Regency Hotel, Hilton Head, South
    Carolina.








                                       44<PAGE>


                                                                  Exhibit 21    
                          THERMO INSTRUMENT SYSTEMS INC.
                          Subsidiaries of the Registrant

As of February 28, 1997, the Registrant owned the following subsidiaries:

                                                          STATE OR     PERCENT
                         NAME                         JURISDICTION OF     OF
                                                       INCORPORATION  OWNERSHIP
  -----------------------------------------------------------------------------
      Analytical Instrument Development, Inc.         Pennsylvania       100
      Eberline Instrument Company Limited             United Kingdom     100
      Eberline Instrument Corporation                 New Mexico         100
      Epsilon Industrial Inc.                         Texas              100
      Flow Automation (UK) Limited                    United Kingdom     100
      Gas Tech Inc.                                   California         100
        Gas Tech Australia, Pty. Ltd.                 Australia          50*
        Gas Tech Partnership                          California         50*
        Gastech Instruments Canada Ltd.               Canada             100
      Houston Atlas Inc.                              Texas              100
      Metrika Systems Corporation                     Delaware            84
        Eberline Radiometrie S.A.                     France             100
        Gamma-Metrics                                 California         100
           Gamma-Metrics International F.S.C. Inc.    Guam               100
        Thermo Instrument Systems GmbH                Germany            100
           Eberline Instruments GmbH                  Germany            100
        Thermo Instrument Systems Limited             United Kingdom     100
      National Nuclear Corporation                    California         100
      Optek-Nicolet Holdings Inc.                     Wisconsin          100
      Thermo Instrument Controls Limited              United Kingdom     100
        Thermo Optek Corporation                      Delaware            93
        (additionally, .30% of the shares are owned
         directly by The Thermo Electron Companies
         Inc.)
           ARL Applied Research Laboratories S.A.     Switzerland        100
             Fisons Instruments (Proprietary)         South Africa       100
              Limited
             Thermo Optek Wissenschaftliche Gerate    Austria            100
              GesmbH
           ATI Acquisition Corp.                      Wisconsin          100
             Mattson Instruments Limited              United Kingdom     100
             Thermo Elemental Limited                 United Kingdom     100
             Thermo Optek Limited                     United Kingdom     100
                Unicam Limited                        United Kingdom     100
                  Unicam Export Limited               United Kingdom     100
             Unicam Analytical Inc.                   Canada             100
             Unicam Analytical Technology The         The Netherlands    100
              Netherlands B.V.
             Unicam Italia SpA                        Italy              100
             Unicam S.A.                              Belgium            100
           Fisons Instruments Inc.                    Canada             100
           Fisons Instruments Nordic AB               Sweden             100
           Nicolet Instrument Corporation             Wisconsin          100
             Nicolet Japan K.K.                       Japan              100
             Spectra-Tech, Europe Limited             United Kingdom     100
             Spectra-Tech, Inc.                       Wisconsin          100
           Nicolet Instrument GmbH                    Germany            100
           Optek Securities Corporation               Massachusetts      100
                                                                 Page 1PAGE
<PAGE>
                          THERMO INSTRUMENT SYSTEMS INC.
                          Subsidiaries of the Registrant

                                                          STATE OR     PERCENT
                         NAME                         JURISDICTION OF     OF
                                                       INCORPORATION  OWNERSHIP
  -----------------------------------------------------------------------------
           Planweld Holding Limited                   United Kingdom     100
             Nicolet Instrument Limited               United Kingdom     100
             Planweld Limited                         United Kingdom     100
                Hilger Analytical Limited             United Kingdom     100
             Thermo Electron Limited                  United Kingdom     100
           Thermo Instrument Systems Japan            Delaware           100
            Holdings, Inc.
             Nippon Jarrell-Ash Company, Ltd.         Japan              100
           Thermo Jarrell Ash Corporation             Massachusetts      100
             Baird Do Brazil Representacoes Ltda.     Brazil             100
             Beijing Baird Analytical Instrument      China              100
              Technology Co. Limited
             Thermo Instrument Systems (F.E.)         China              100
              Limited
             Thermo Instruments (Canada) Inc.         Canada             100
                Eberline Instruments (Canada) Ltd.    Canada             100
           Thermo Optek France S.A.                   France             100
           Thermo Optek Holding B.V.                  The Netherlands    100
             Baird Europe B.V.                        The Netherlands    100
                Baird France S.A.R.L.                 France             100
             Thermo Group B.V.                        The Netherlands    100
           Thermo Vision Corporation                  Delaware           100
             CID Technologies Inc.                    New York           100
             Laser Science, Inc.                      Delaware           100
             Oriel Instruments Corporation            Delaware           100
                Oriel Foreign Sales Corp.             U.S. Virgin        100
                                                      Islands
             Scientific Measurement Systems Inc.      Colorado           100
        ThermoSpectra Corporation                     Delaware            75
        (additionally, .88% of the shares are owned
         directly by The Thermo Electron Companies
         Inc.)
           Diametrix Detectors, Inc.                  Delaware            50
           Gould Instrument Systems, Inc.             Ohio               100
           Kevex Instruments Inc.                     Delaware           100
           Kevex X-Ray Inc.                           Delaware           100
             Nicolet Instrument Technologies Inc.     Wisconsin          100
           NORAN Instruments Inc.                     Wisconsin          100
           Park Acquisition Corp.                     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
             Thermo Spectra S.A.                      France             100
                Nicolet Technologies S.A.R.L.         France             100
                                                              Page 2PAGE
<PAGE>
                          THERMO INSTRUMENT SYSTEMS INC.
                          Subsidiaries of the Registrant

                                                          STATE OR     PERCENT
                         NAME                         JURISDICTION OF     OF
                                                       INCORPORATION  OWNERSHIP
  -----------------------------------------------------------------------------
      Quest-Finnigan Holdings Inc.                    Virginia           100
      Quest-TSP Holdings Inc.                         Delaware           100
        ThermoQuest Corporation                       Delaware            93
        (50% of which shares are owned
         directly by Quest-Finnigan Holdings Inc.)
        (additionally, .12% of the shares are owned
         directly by The Thermo Electron Companies
         Inc.)
           Finnigan FT/MS Inc.                        Delaware           100
           Finnigan Corporation                       Delaware           100
             Finnigan Instruments, Inc.               New York           100
             Finnigan International Sales, Inc.       California         100
             Finnigan MAT China, Inc.                 California         100
             Finnigan MAT (Delaware), Inc.            Delaware           100
             Finnigan MAT Instruments, Inc.           Nevada             100
             Finnigan MAT International Sales, Inc.   California         100
             Finnigan MAT (Nevada), Inc.              Nevada             100
                Finnigan MAT AG                       Switzerland        100
                Finnigan MAT Canada, Ltd.             Canada             100
                Finnigan MAT GmbH                     Germany            100
                Finnigan MAT S.R.L.                   Italy              100
                  Thermo Separation Products S.R.L.   Italy              100
                Thermo Instruments Australia Pty      Australia          100
                 Limited
                ThermoQuest Ltd.                      United Kingdom     100
                  Finnigan MAT Ltd.                   United Kingdom     100
                     Finnigan MAT AB                  Sweden             100
                  Thermo Separation Products Ltd.     United Kingdom     100
             Finnigan Properties, Inc.                California         100
             Masslab Limited                          United Kingdom     100
           ThermoQuest B.V.                           The Netherlands    100
             Thermo Separation Products B.V.          The Netherlands    100
                Thermo Separation Products B.V. B.A.  Belgium            100
           ThermoQuest France S.A.                    France             100
             Finnigan Automass S.A.                   France             100
             Finnigan MAT S.A.R.L.                    France             100
             Thermo Separation Products S.A.          France             100
           ThermoQuest Italia S.p.A.                  Italy              100
           ThermoQuest Spain S.A.                     Spain              100
           ThermoQuest Wissenschaftliche Gerate GmbH  Austria            100
           Thermo Separation Products AG              Switzerland        100
           Thermo Separation Products Inc.            Delaware           100
           ThermoQuest GmbH                           Germany            100
             Thermo Separation Products GmbH          Germany            100
           ThermoQuest K.K.                           Japan              100
      SID Instruments Inc.                            Delaware           100
        FI Instruments Inc.                           Delaware           100
        Fisons Instruments BV                         The Netherlands    100
        Fisons Instruments NV                         Belgium            100
                                                                 Page 3PAGE
<PAGE>
                          THERMO INSTRUMENT SYSTEMS INC.
                          Subsidiaries of the Registrant

                                                          STATE OR     PERCENT
                         NAME                         JURISDICTION OF     OF
                                                       INCORPORATION  OWNERSHIP
  -----------------------------------------------------------------------------
        Fisons Instruments K.K.                       Japan              100
        Fisons Instruments S.A.                       France             100
        HB Instruments Inc.                           Delaware           100
        NK Instruments Inc.                           Delaware           100
        Thermo Capillary Electrophoresis Inc.         Delaware           100
        Thermo Haake Ltd.                             United Kingdom     100
        Thermo Haake (U.K.) Limited                   United Kingdom     100
        Thermo Instrument (S.E.A.) Pte Limited        Singapore          100
        Thermo Instrumentos Cientificos S.A.          Spain              100
        Thermo VG Systems Limited                     United Kingdom     100
      Spectrace Instruments Inc.                      California         100
      Thermo BioAnalysis Corporation                  Delaware            67
      (4.7% of which shares are owned directly by
        Quest-TSP Holdings Inc. and 2% of which
        shares are owned directly by
        Quest-Finnigan Holdings Inc.)
        Dynatech Laboratories spol. s.r.o.            Czech Republic     100
        DYNEX Technologies (Asia) Inc.                Delaware           100
        DYNEX Technologies Inc.                       Virginia           100
        Thermo BioAnalysis GmbH                       Germany            100
           Dynatech Deutschland GmbH                  Germany            100
           Thermo LabSystems Vertriebs GmbH           Germany            100
        Thermo BioAnalysis (Guernsey) Ltd.            Channel Islands    100
        Thermo BioAnalysis Holding, Limited           United Kingdom     100
           Dynex Technologies Limited                 United Kingdom     100
           Thermo BioAnalysis Ltd.                    United Kingdom     100
           Thermo FAST UK Limited                     United Kingdom     100
           Thermo LabSystems Limited                  United Kingdom     100
        Thermo BioAnalysis S.A.                       France             100
           Thermo LabSystems S.A.R.L.                 France             100
        Thermo LabSystem (Australia) Pty Limited      Australia          100
        Thermo LabSystems Inc.                         Massachusetts     100
      Thermo Environmental Instruments Inc.           California         100
      Thermo Instrument Controls Inc.                 Delaware           100
        Flow Automation Inc.                          Texas              100
        Thermo Instrument Controls de Mexico,         Mexico             100
         S.A. de C.V.(1% of which shares are
         owned directly by Thermo Instrument
         Systems Inc.)
        VG Gas Analysis Systems Inc.                  Massachusetts      100
      Thermo Instruments do Brasil Ltda.              Brazil             100
      (1% of which shares are owned directly
       by Thermo Jarrell Ash Corporation)
      TN Technologies Inc.                            Texas              100
        Kay-Ray/Sensall, Inc.                          Delaware          100
        TN Technologies Canada Inc.                   Canada             100
      VG Gas Analysis Limited                         United Kingdom     100
      Van Hengel Holding B.V.                         The Netherlands    100
        Eberline Monitoring GmbH                      Germany            100
        Fisons Instruments Vertriebs GmbH             Germany            100
                                                                 Page 4PAGE
<PAGE>
                          THERMO INSTRUMENT SYSTEMS INC.
                          Subsidiaries of the Registrant

                                                          STATE OR     PERCENT
                         NAME                         JURISDICTION OF     OF
                                                       INCORPORATION  OWNERSHIP
  -----------------------------------------------------------------------------
           Gebruder Haake GmbH                        Germany            100
        Thermo Instrument Systems B.V.                The Netherlands    100
           Euroglas B.V.                              The Netherlands    100
           Thermo Automation Services  (ThAS) B.V.    The Netherlands    100
           This Analytical B.V.                       The Netherlands    100
           This Gas Analysis B.V.                     The Netherlands    100
           This Lab Systems B.V.                      The Netherlands    100
           This Scientific B.V.                       The Netherlands    100
        Thermo Instruments GmbH                       Germany            100
        Thermo Jarrell Ash, S.A.                      Spain              100
        TN Spectrace Europe B.V.                      The Netherlands    100
      Westronics Inc.                                 Texas              100
 
* Joint Venture/Partnership


                                                                    Exhibit 23


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

        As independent public accountants, we hereby consent to the
   incorporation by reference of our reports dated February 11, 1997 (except
   with respect to the matter discussed in Note 15 as to which the date is
   March 12, 1997), included in or incorporated by reference into Thermo
   Instrument Systems Inc.'s Annual Report on Form 10-K for the year ended
   December 28, 1996, into the Company's previously filed Registration
   Statements as follows: Registration Statement No. 33-14980 on Form S-8,
   Registration Statement No. 33-16461 on Form S-8, Registration Statement No.
   33-14974 on Form S-8, Post Effective Amendment to Registration Statement on
   Form S-4 No. 33-32579-02 on Form S-8, Registration Statement No. 33-33577
   on Form S-8, Registration Statement No. 33-36221 on Form S-8, Registration
   Statement No. 33-37866 on Form S-8, Registration Statement No. 33-42270 on
   Form S-3, Registration Statement No. 33-69526 on Form S-3, Registration
   Statement No. 33-65275 on Form S-8, and Registration Statement No. 33-37559
   on Form S-8.



                                                Arthur Andersen LLP



   Boston, Massachusetts
   March 19, 1997


<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THERMO
INSTRUMENT SYSTEMS INC.'S ANNUAL REPORT ON FORM 10-K FOR THE YEAR ENDED
DECEMBER 28, 1996 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH
FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-28-1996
<PERIOD-END>                               DEC-28-1996
<CASH>                                         522,688
<SECURITIES>                                     7,452
<RECEIVABLES>                                  320,312
<ALLOWANCES>                                    16,981
<INVENTORY>                                    213,683
<CURRENT-ASSETS>                             1,124,910
<PP&E>                                         250,976
<DEPRECIATION>                                  72,313
<TOTAL-ASSETS>                               1,924,400
<CURRENT-LIABILITIES>                          488,207
<BONDS>                                        399,214
                                0
                                          0
<COMMON>                                         9,767
<OTHER-SE>                                     736,500
<TOTAL-LIABILITY-AND-EQUITY>                 1,924,400
<SALES>                                      1,209,362
<TOTAL-REVENUES>                             1,209,362
<CGS>                                          654,165
<TOTAL-COSTS>                                  654,165
<OTHER-EXPENSES>                                87,591
<LOSS-PROVISION>                                 2,274
<INTEREST-EXPENSE>                              28,923
<INCOME-PRETAX>                                189,923
<INCOME-TAX>                                    51,727
<INCOME-CONTINUING>                            132,751
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                   132,751
<EPS-PRIMARY>                                     1.40
<EPS-DILUTED>                                     1.27
        


</TABLE>


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