Keithley Instruments designs, develops, and manufactures data acquisition (DAQ) test instruments and complete testing system solutions. Keithley is a manufacturer of more than 500 types of test equipment for product design, scientific research, and manufacturing. Products include electrometers, voltmeters, analyzers, meters, amplifiers, signal generators, data acquisition, and system components. Engineers, scientists, and technicians use Keithley products to measure, source, control, or communicate direct current (DC), optical, or radiofrequency (RF) signals. In 2010, the Keithley brand became part of the Danaher Corporation, merging many operations with Tektronix. You can choose from dozens of new, used, and professionally refurbished Keithley products at ValueTronics.com.