Keithley Creates How-To Temperature Measurements CD

FOR IMMEDIATE RELEASE



Cleveland, OH - June 8, 2004 - Keithley Instruments, Inc. (NYSE:KEI), a world leader in advanced electrical test instruments and systems, today announced that it is releasing an interactive, tutorial CD on making accurate temperature measurements. Understanding Measurements - Temperature offers insight into the techniques available for measuring temperature and choosing the best method for particular temperature measurement applications. The CD is available free of charge at http://www.keithley.com/pr/004.html.

Understanding Measurements - Temperature answers some of the most common questions surrounding temperature measurements, including:

• What are the different sensors used to make temperature measurements?
• How do the sensor types vary and which is best for a certain application?
• What type of instrumentation can make temperature measurements?

The interactive selector guide lets the user match the proper temperature measurement instrument to a specific application. Additionally, the CD provides tips and techniques for avoiding the errors that are most often made when making temperature measurements. A variety of useful educational resources are available both on- and off-line, including FAQs, a glossary, helpful links to sites like NIST (National Institute of Standards and Technology), and more.

About Keithley Instruments, Inc.

With more than 50 years of measurement expertise, Keithley Instruments (www.keithley.com) 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.