Instrumentation is an instrument or equipment used to detect, measure, observe, and calculate various physical quantities, material components, physical parameters, etc. Vacuum leak detectors, pressure gauges, length gauges, microscopes, multipliers, etc. are all instruments and meters. In a broad sense, instruments and meters can also have functions such as automatic control, alarm, signal transmission, and data processing. For example, pneumatic regulating instruments used in industrial production process automatic control, electric regulating instruments, and distributed instrument control systems are also instruments and meters.