Stanford Research Systems (SRS) has a 40-year history of designing and manufacturing test equipment for research. Products include lock-in amplifiers, atomic clocks, mass spectrometers, vacuum and gas analyzers, lasers and laser controllers, signal sources, and signal analyzers. Our customers include academic researchers, test and measurement laboratories, electronic equipment manufacturers, and government agencies. When your electronic, vacuum, or timing measurements require accuracy, precision, and stability… Think SRS.