with more than 50 years of measurement expertise, keithley instruments has become a world leader in advanced electrical test instruments and systems for semiconductor, wireless, optoelectronics, and other segments of the worldwide electronics industry. engineers and scientists rely on keithley's instrumentation to make even the most demanding electrical measurements with confidence. keithley technology can be found on production floors of the most advanced electronics manufacturing facilities, in leading development labs, and in research departments of the world's prominent universities and corporate r&d centers.