For more than 70 years, Keithley, a Tektronix company, has been designing, manufacturing and marketing advanced electrical test instruments and systems for the specialized needs of electronics manufacturers in high performance production testing, process monitoring, product development and research.Keithley has approximately 500 products that are used to source, measure, connect, control or communicate direct current (DC) or pulsed electrical signals. Keithley customers include scientists and engineers in the worldwide electronics industry involved with 3D sensing, advance materials research, semiconductor device development and fabrication, and the production of end products such as portable wireless devices.