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A gauge 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 housing is a mechanical component's container or covering. In restaurant equipment, a housing is an exterior case or enclosure used to protect an interior mechanism, including integrated fittings or brackets to keep internal components in place. The housing prevents the interior mechanism from being fouled by outside debris or to contain the internal components.