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News Release
June 8, 2000


MIDDLEFIELD, CONNECTICUT June 8, 2000…..Zygo Corporation (NASDAQ:ZIGO), today announced that it has been granted Preferred Supplier status by the Fuel Systems Business of Cummins Engine Company, Inc. (NYSE:CUM) for white light interferometer based metrology. This technology is used by manufacturers of precision-machined components and is especially effective in Fuel Systems applications for the measurement of critical product surface parameters. Fast, noncontact inspection of surface geometry and topography is useful in helping manufacturers meet the tightening tolerances needed for enhanced diesel and gasoline engine performance and federally mandated emission reductions.

After completing a comprehensive analysis performed by the Dimensional Metrology department of Cummins' Fuel Systems Business, Zygo Corporation's instrument was selected over other competing technologies. ZYGO and Cummins have also agreed to collaborate on future product performance improvements using advanced sensor technology, and in the exploration of additional requirements for new Fuel Systems-related products to be announced by ZYGO.

The result reinforces the preference for ZYGO's gaging equipment for form and roughness measurement in Fuel Systems and related precision component manufacturing applications. The testing took into account the flexibility, speed, accuracy, and precision required to measure many critical fuel injector features. The evaluation may also be used as a guideline for other Cummins applications and by Cummins suppliers.

"ZYGO views its selection as confirmation of the many user benefits of opto-interferometric gaging in critical lab and production applications" said Mike Majlak, Automotive Industry Marketing Manager at ZYGO. "It also confirms the depth of current applications expertise and ZYGO's commitment to gaging system development for the Fuel Systems and precision component manufacturing industries. Further, it attests to the desire by key global companies to use leading edge optical gaging technology to better control manufacturing processes, resulting in scrap reduction and a higher return on capital investment."

Zygo Corporation designs, develops, manufactures, and markets high performance measurement and yield improvement instruments, custom automation systems, and accessories used in high technology industries. The Company is headquartered in Middlefield, Connecticut, and also has operations in Asslar, Germany; Longmont, Colorado; and sales offices throughout the world. ZYGO is traded on the Nasdaq National Market under the symbol ZIGO. Additional information on the Company is available on the Internet at

This press release may contain forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended, which reflect the Company's current judgment on certain issues. Because such statements apply to future events, they are subject to risks and uncertainties that could cause the actual results to differ materially. Important factors which could cause actual results to differ materially are described in the Company's reports on Form 10-K and 10-Q on file with the Securities and Exchange Commission.

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