Ir guns are Great tools but they have some quirks too. They reflect off of shiny objects easily giving false reading (glass plastic and metals especially) some things reflect it light in differing amounts ( emisifity) that will also effect readings. It is impossible to say for sure but a degree variation from probe to gun add a bit of reflection it would be easy to have 100% even and still read 2-4 degrees different. Add some real variation and it is even farther.

Have you ever checked the accuracy specs on your ir gun? On the thermostat? This will tell you haw far it could vary while actually be the same. I would be very surprised if the gun was.better than 2 degrees (4 degree range ) and the thermostat was better than one degree . I am a real fussy pants for accuracy I check every thermometer / pyrometer against a known thermometer. Often the TStat probe can be used as a benchmark but the Ve series are a bit of an unknown that way as there seem to be a lack of published specs and the manufacturer is unknown. The assumption is one degree I have been told this by sales reps but no one has said if it is not this it it is faulty and will be replaced either.

I suspect it is partially the instrument variation, uneven heating , and the probe placement not one thing but a combination.


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