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They are pretty cheap.
Calibrate them by checking that each of the two thermometers is reading correctly at around 95F, or so.
Here is how to do that:
https://www.backyardchickens.com/forum/viewtopic.php?id=130840
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OK, I'm gonna ask...
If it says you should not do the salt test, how do you know it's accurate or why do you believe it's accurate.
Check it against a calibrated wet-bulb thermometer
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However, the best is also the most difficult to use
Quite right, wet bulb thermometers work well, but keeping the wicks clean, and understanding what it is telling you will prove tricky for a lot of folk around here
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I trust the one that was calibrated
I have an Amprobe, which I use to check cheaper digital Hygrometers.
The $6 Sprinfield, available in Walmart and on eBay generally works well. Buy two