Keithley Instruments Presentation at the Thomas Weisel Partners Test and Measurement Conference ...

Cleveland, Ohio - December 6, 2002 - Keithley Instruments, Inc. (NYSE:KEI), a leader in solutions for emerging measurement needs, today announced that Joseph P. Keithley, Chairman, President and Chief Executive Officer, will speak to the investment community at the Thomas Weisel Partners Test and Measurement Conference at TWP's New York Offices on December 11, 2002., at 9:40 a.m.