Good point. Historically, analog mercury thermometers are the most accurate and in a room with stable temps, will give the best/most accurate reading. If the temp is constantly changing (hopefully not in your living room), that's another story as they do not adjust as quickly as a IR temp gun.Originally Posted by Godzilla78
How do you know that your temp gun is off or your thermometer you read with the temp gun is off?
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That's why I use my home/room thermostat and shoot it with the temp gun at the same distance as I measure in the tank. However, I also have a digital thermometer in the room, and the discrepancy between how off the IR Temp Gun is on one versus the other is usually de minimis. So, now that I know that, I can pretty reliably use either one.
Is it perfect, no, but I still wouldn't rely only a the temp gun by itself for temp measurement without some basis for how on the ball it is. Try two different temp guns on the same spot back to back. Do you get the same reading?
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