Stanford Research Systems formed in 1980 to design and manufacturer high performance test equipment such as radiofrequency (RF) signal generators and current sources. In its more than 30 years of business, Stanford has grown to provide dozens of important industry tools and electronic test devices. Stanford Research manufactures laser diode controllers, temperature controllers, optical choppers, power supplies, spectrum analyzers, meters, data loggers, distribution amplifiers, preamps, signal generators, counters, oscillators, and meters. Engineers who need a product for most kinds of tests can count on Stanford Research to have the right tool. ValueTronics.com sells a variety of used, refurbished Stanford Research equipment.