Temp guns are as mentioned not super accurate. The best I have ever seen allows double the error of a herpstat. They also are effected by reflection shiny surfaces are going to be suspect. Metals as well this includes metal oxides found in high end pigments. They are a great tool but best used for general readings and a sense of the conditions rather than critical work. I would suggest that 'accurate' is in the 1-3 degrees of an ir guns reading I would not expect better.


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