Take an ice cube out of the freezer and put the temp gun within 1 inch of less from the ice cube and see what it reads. It should read 32F or very close. That is about as accurate as you are going to get. Also remember, the farther away from the object you are checking, the more the temp could be off because the beam has to travel. Thats why most temp guns say to try and put the gun as close to the object as you can.
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