An infrared thermometer is a thermometer which infers temperature from a portion of the thermal radiation sometimes called blackbody radiation emitted by the object being measured. They are sometimes called laser thermometers if a laser is used to help aim the thermometer, or non-contact thermometers or temperature guns, to describe the device`s ....
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http://en.wikipedia.org/wiki/Infrared_thermometer
A temperature measurement device that works without coming into contact with the object or surface that is having its temperature recorded. Infrared thermometers detect the infrared, or heat, radiation given off by all materials. By knowing the amount of infrared energy emitted by the object and its...
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http://www.daviddarling.info/encyclopedia/I/AE_infrared_thermometer.html
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