MKS Instruments, Inc. provides instruments, subsystems, and process control solutions that measure, control, power, deliver, monitor, and analyze critical parameters of manufacturing processes worldwide. The company operates through two segments, Vacuum & Analysis and Light & Motion. The Vacuum & Analysis segment provides analytical and control solutions products, including gas analyzers, automation control products, I/O modules, automation software, and precision machined components and electromechanical assemblies; and materials delivery solutions products comprising flow and valve technologies, as well as integrated pressure measurement and control subsystems to provide customers with precise control capabilities that are optimized for a given application. It also offers power delivery, plasma, and reactive gas generation products used in semiconductor and other thin film applications, and in medical imaging equipment applications; and direct and indirect pressure measurement and integrated process solutions. The Light & Motion segment offers lasers and laser-based systems, including lasers and amplifiers, fiber lasers, diode-pumped solid-state lasers, high-energy pulsed lasers, and tunable lasers, as well as accessories; optics products, such as precision optics, thin-film filters and coatings, replicated mirrors, and ruled and holographic diffraction gratings; and photonics products comprising optical components, vibration, lens assemblies, and isolation solutions, as well as three-dimensional non-contact measurement sensors and equipment. It markets and sells its products and services through global direct sales organization, independent distributors and sales representatives, Websites, and product catalogs. The company was founded in 1961 and is headquartered in Andover, Massachusetts.