Keithley Instruments Schedules Fourth Quarter Fiscal 2009 Earnings Release and Conference Call

Keithley Instruments, Inc. (NYSE: KEI), a world leader in advanced electrical test instruments and systems, announced the Company will release results for its fourth quarter of fiscal year 2009, which ended September 30, 2009, on Tuesday, November 17, 2009. 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 Standard Time. This call is being webcast by Thomson 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 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 products for their critical measurement needs and a rich understanding of their applications to improve the quality of their products and reduce their cost of test.