4 out of 5 units appear to be within the stated accuracy tolerance, but one has a serious calibration problem. First photo of a single device after 5 hours in my fully working fridge, still 65 degrees. In my 70 degree house that's almost 100 as you can see in the 2nd picture. I was planning on using them in my reptile cages but I'm glad I tested them ahead of time. I will try to return/exchange.
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