2008-04-18 23:08:28 -

- Keithley Instruments, Inc. (NYSE:KEI), a leader in solutions for emerging measurement needs, announced the Company will release results for its second quarter of fiscal year 2008, which ended March 31, 2008, on Thursday, April 24, 2008. The results will be released before the stock market opens.

The Company will host a conference call which will be broadcast over

the Internet that same day at 10 a.m. Eastern Time. This call is being webcast by Thomson/CCBN and can be accessed from the Investor section of Keithley's website at www.keithley.com.

The webcast is also being distributed through the Thomson StreetEvents Network. Individual investors can listen to the call at www.earnings.com, Thomson's individual investor portal, powered by StreetEvents. Institutional investors can access the call via Thomson StreetEvents (www.streetevents.com), a password-protected event management site.

With more than 60 years of measurement expertise, Keithley Instruments has become a world leader in advanced electrical test instruments and systems from DC to RF (radio frequency). Our products solve emerging measurement needs in production testing, process monitoring, product development, and research. Our customers are scientists and engineers in the worldwide electronics industry involved with advanced materials research, semiconductor device development and fabrication, and the production of end products such as portable wireless devices. The value we provide them is a combination of precision measurement technology and a rich understanding of their applications to improve the quality of their products and reduce their cost of test.

Keithley Instruments, Inc.
Mark J. Plush, Vice President and Chief Financial Officer
440-248-0400