My husband is a mechanic and uses temp guns. They taught him in school that the way to tell if a temp gun is reading temperatures correctly is to measure the temperature of a glass of ice water -- should be exactly 32 degrees. I tried it with mine and it worked. You can also use this trick to find the "sweet spot." That's how I figured out that my gun needs to be about 6" from the surface of what I'm measuring to get a correct read.
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