Contact: Keithley Instruments, Inc.
28775 Aurora Road
Cleveland, Ohio 44139

Keithley Enters Agreement to Distribute Elgar Power Supplies in Asia

Cleveland, OH - April 2, 2004 - Keithley Instruments, Inc. (NYSE:KEI), a world leader in advanced electrical test instruments and systems, has signed an agreement with Elgar Electronics Corporation, San Diego, CA, to sell, service, and support the full line of Elgar programmable power supplies through Keithley's sales and support offices located throughout China, Taiwan, and Japan. This alliance enables Keithley to offer a more complete range of quality test and measurement products and services. The products will continue to be sold under the Elgar and Sorensen brand names. Elgar will continue to sell and support its products through its own sales channels in North America, Europe, and the rest of Asia/Pacific.

Elgar's product line includes AC power sources, programmable DC power systems and loads, solar array simulators, and integrated rack power subsystem services. Keithley products include highly accurate instruments and data acquisition products that measure low levels of voltage, resistance, current, capacitance, and charge, along with complete system solutions for high volume production and assembly testing.

"This agreement brings significant benefits to both Keithley and Elgar," explains Linda Rae, Keithley Senior Vice President/General Manager. "It allows our Asian customers to obtain a more complete measurement solution from a single company, while at the same time it improves Elgar's market presence in this fast-growing region of the electronics marketplace."

Keithley began building a presence in Asia more than four decades ago. Today, its employees operate throughout Japan, Taiwan, Korea, Singapore, and China. The company began expanding its Chinese presence several years ago by adding staff and opening offices in Beijing, Shanghai, and Shenzhen.

With more than 50 years of measurement expertise, Keithley Instruments has become a world leader in advanced electrical test instruments and systems from DC to RF (radio frequency) geared to the specialized needs of electronics manufacturers for high performance production testing, process monitoring, product development, and research. By building upon our strength in electrical measurement solutions for research, Keithley has become a production test technology leader for the semiconductor, wireless, optoelectronics, and other precision electronics segments of the worldwide electronics industry. The value we provide to our customers is a combination of precision measurement technology and a rich understanding of their applications to improve the quality, throughput, and yield of their products.

Products and company names listed are trademarks or trade names of their respective companies.

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