Temperature gauge

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A temperature gauge is a device used to indicate the temperature of an item being monitored. The display can be an analogue dial, an Analogue range or a digital readout. The word gauge would seem to exclude a thermometer, which uses the thermal expansion of a liquid, but in the sense that it measures temperature it would seem to qualify. Common methods of measuring temperature include bimetallic strip (the bending of which increases with temperature) and the thermocouple which produces an electronic voltage that depends on the temperature.