Hygrometers for curing

What kind of hygrometers are you using for your jars during curing? I have basic wide mouth canning jars from walmart.

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I use these:
Mini Digital Temperature Humidity Meter Gauge Thermometer Hygrometer LCD Degree Celsius© Display Black

In Celsius only because they are cheaper than the Fahrenheit ones lol


Thanks, I saw Amazon selling 5 packs of them. Just wasnt sure of size.

They’re teeny, and take LR44 button batteries. The PR44 batteries for hearing aids work, too, which is great, since I have extras lol