In short, do you trust the temp it's showing given that it's not measuring the beer temperature directly? I've heard there can be a difference of a few degrees between what Fermometer is showing and the actual temp.
Every time I have tested them they have been withing 1 degree of the actual wort.
It's "close enough" for me to be happy. I've found that is usually within a degree or so when I've tested it so I stopped testing it. I mean, if the fermometer says "66", even if it's wrong by two degrees either way that's fine.
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