MKS Instruments, Inc. provides instruments, subsystems, and process control solutions that measure, control, power, monitor, and analyze critical parameters of manufacturing processes in the United States and internationally. The company operates through four segments: Advanced Manufacturing Capital Equipment, Analytical Solutions Group, Europe Region Sales & Service, and Asia Region Sales & Service. It offers pressure measurement and control products used for various pressure ranges and accuracies; materials delivery products, including gas flow measurement and control products; control products comprising digital control network products, process chambers, system controllers, and connectivity products; and vacuum technology products, including vacuum containment components, vacuum gauges, vacuum valves, effluent management subsystems and custom stainless steel chambers, and vessels and pharmaceutical process equipment hardware and housings. The company also provides power delivery and reactive gas generation products, such as power delivery and reactive gas generation products that are used in semiconductor and other thin film applications. In addition, it offers gas composition analysis products, such as mass spectrometry-based gas composition analysis instruments, and Fourier transform infra-red based gas composition analysis products used in the engine development, environmental emissions monitoring, air safety monitoring, and semiconductor industries; information technology products, including software products for analyzing data sets for the pharmaceutical, biotech, and other industries. The company also builds precision machined components and electromechanical assemblies for the analytical instrument, scientific, semiconductor, and medical industries. It serves semiconductor capital equipment manufacturers through direct sales forces, sales representatives, and agents. The company was founded in 1961 and is headquartered in Andover, Massachusetts.