Keithley, a Tektronix company, has been engaged in designing, manufacturing, and marketing sophisticated electrical test instruments and systems tailored to meet the specific requirements of electronics manufacturers in high-performance production testing, process monitoring, product development, and research.

Keithley offers around 500 products designed to source, measure, connect, control, or transmit direct current (DC) or pulsed electrical signals. Its customers include scientists and engineers in the global electronics industry working in areas such as 3D sensing, advanced materials research, semiconductor device development and fabrication, as well as the manufacturing of end products like portable wireless devices.