Gauge (instrument)

A gauge or gage, in science and engineering, is a device used to make measurements or in order to display certain dimensional information. A wide variety of tools exist which serve such functions, ranging from simple pieces of material against which sizes can be measured to complex pieces of machinery. Depending on usage, a gauge can be described as 'a device for measuring a physical quantity', for example 'to determine thickness, gap in space, diameter of materials, or pressure of flow', or 'a device that displays the measurement of a monitored system by the use of a needle or pointer that moves along a calibrated scale'. A gauge or gage, in science and engineering, is a device used to make measurements or in order to display certain dimensional information. A wide variety of tools exist which serve such functions, ranging from simple pieces of material against which sizes can be measured to complex pieces of machinery. Depending on usage, a gauge can be described as 'a device for measuring a physical quantity', for example 'to determine thickness, gap in space, diameter of materials, or pressure of flow', or 'a device that displays the measurement of a monitored system by the use of a needle or pointer that moves along a calibrated scale'.