Keithley Instruments to Present at the Noble Financial Sixth Annual Equity Conference – ONTRACK 2010

Keithley Instruments, Inc. (NYSE:KEI), a world leader in advanced electrical test instruments and systems, today announced that Linda C. Rae, Executive Vice President and Chief Operating Officer, along with Mark J. Plush, Senior Vice President and Chief Financial Officer, will make a presentation to the investment community at the Noble Financial Sixth Annual Equity Conference to be held at the Hard Rock Hotel, in Hollywood, Florida. The presentation will take place on Monday, June 7, 2010, at 12:30 p.m. EDT.

The presentation will be webcast live and available for viewing at www.keithley.com under the Investor Relations section of the Company’s website. Keithley recommends registering at least ten minutes prior to the start of the presentation to ensure timely access. Individuals will need the SilverLight viewer (a free download from the presentation link) to access the webcast. A replay of the webcast will be available on the Company’s website for approximately 90 days following the event.

About Keithley Instruments, Inc.

With more than 60 years of measurement expertise, Keithley Instruments has become a world leader in advanced electrical test instruments and systems. 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.