MKS Instruments, Inc., together with its subsidiaries, provides instruments, subsystems, and process control solutions that measure, control, power, monitor, and analyze parameters of manufacturing processes worldwide. It offers instruments and control systems, such as pressure measurement and control, materials delivery, gas composition analysis, and control and information technology products. The company also provides power and reactive gas generation products comprising power delivery, reactive gas generation, processing thin films, and equipment cleaning products; and vacuum technology products, including vacuum containment components, vacuum gauges, vacuum valves, effluent management subsystems and custom stainless steel chambers, vessels, and pharmaceutical process equipment hardware and housings. Its products are used in the semiconductor processing steps, such as depositing thin films of material onto silicon wafer substrates, and etching and cleaning circuit patterns; manufacture of flat panel displays, light emitting diodes, solar cells, data storage media, and other coatings, including architectural glass; energy generation and environmental monitoring processes, such as nuclear fuel processing, fuel cell research, greenhouse gas monitoring, and chemical agent detection; medical instrument sterilization; consumable medical supply manufacturing; and pharmaceutical applications. The company also offers maintenance and repair, software maintenance, installation, and training services. It serves semiconductor capital equipment and device manufacturers, thin film capital equipment manufacturers, energy generation, environmental monitoring, and manufacturing companies, as well as government, university and industrial research laboratories. The company sells its products primarily through its direct sales force, as well as through sales representatives and agents. MKS Instruments, Inc. was founded in 1961 and is headquartered in Andover, Massachusetts.