Established in 1980, Stanford Research Systems Inc. is a company, which designs and manufactures test equipment. Based in Sunnyvale, Calif., the firm primarily makes instruments for research and industrial applications across the United States and worldwide. Its scientific instrument category offers products, such as optical choppers, photon counters, digital delay generators and laser diode controllers. In addition, the company provides a variety of test/measurement, time/frequency and vacuum/analytical instruments. The company also offers technical and sales support services.