I needed a probe thermometer to check the air conditioner temperature in my car and also one that I can use around the house. I checked the ice water gauge (32 degrees) for 30 minutes and the thermometer read 34. It also read 2 degrees more than my mercury thermometer. I used an infrared laser thermometer on an air conditioner and got the same reading as Robinair. It's not adjustable, but as long as I know it's a little higher I can use it.
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