Vistec's MIE business unit is one of three internationally active business units of Vistec Semiconductor Systems, which was formerly a part of Leica Microsystems and took on its current name in March 2006.

Gerhard Ruppik, General Manager of Vistec's MIE business unit, said, "Becoming part of KLA-Tencor, the world leader in inspection and metrology, is a unique opportunity for us to accelerate our advanced technology development."

Vistec's advanced mask metrology tools for registration metrology (pattern placement) are among the leading tools in this area. In addition, the company's latest pattern placement metrology tool, which is already being used by customers to measure prototype EUV masks, offers state-of-the-art repeatability and accuracy in 2-dimensional coordinate measurement. The MIE business unit of Vistec is also a leading provider of SEM-based tools for mask critical dimension (CD) measurement, with products designed to meet the requirements of 45nm photomask production and 32nm development. Other MIE technologies include macro defect-inspection systems, overlay-measurement systems for MEMS applications, and software packages for defect classification and data analysis.

The transaction is subject to customary closing conditions, including regulatory approvals, and is expected to close before the end of calendar year 2008.

About KLA-Tencor: KLA-Tencor is the world leader in yield management and process control solutions for semiconductor manufacturing and related industries. Headquartered in Milpitas, California, the Company has sales and service offices around the world. An S&P 500 company, KLA-Tencor is traded on the NASDAQ Global Select Market under the symbol KLAC. Additional information about the Company is available at http://www.kla-tencor.com.

Forward Looking Statements: Statements in this press release other than historical facts, such as statements regarding the anticipated timing of the closing of the transaction and the potential benefits that may result from the transaction, are forward-looking statements and are subject to the Safe Harbor provisions created by the Private Securities Litigation Reform Act of 1995. These forward-looking statements are based on current information and expectations, and involve a number of risks and uncertainties. Actual results may differ materially from those projected in such statements due to various factors, including but not limited to those associated with demand for the companies' respective product lines; the results of product development efforts; the success of product offerings to meet customer needs within the timeframes required by customers in these markets; disruption from the proposed acquisition making it more difficult to maintain relationships with customers, vendors and employees; the failure to obtain and retain expected benefits from the proposed acquisition; delays in obtaining, or adverse conditions contained in, any required regulatory approvals; failure to consummate or delay in consummating the proposed acquisition for other reasons, changes in laws or regulations; and other similar factors. For other factors that may cause actual results to differ materially from those projected and anticipated in forward-looking statements in this release, please refer to the Company's Annual Report on Form 10-K for the year ended June 30, 2007, subsequently filed Quarterly Reports on Form 10-Q and other filings with the Securities and Exchange Commission (including, but not limited to, the risk factors described therein).