I have that same exo terra hygro/therm and it did not work too good for me. Go to walmart and look for acurites, I find these to be the best. Get the $12 one with the probe. That exo terra hygro was reading at 80% humidity at all times. I have it outside just on a shelf and it reads 75%. I'm in Florida where it is humid, but inside is not 75% humidity. Maybe yours is accurate and the exoterra I got was defective, but try getting the acurite.
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