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Electronic thermometers that assess the temperature by determining the intensity of infrared light emission. These thermometers consist of an infrared probe, electronic circuitry, and a display. Schematically, infrared thermometers resemble a photographic camera, consisting of a shutter, a reflective barrel (in place of a camera lens), and a passive infrared detector (in place of film). These thermometers take a sample of the thermal radiation, usually without contact with the measured object, and display the temperature within a few seconds.
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