I've had this happen also....maybe try a fresh battery for starters. For some reason my Acurite and my gauge was off about the same as you. 64% 42%. I put in a fresh battery and it seemed to be better, then I moved it farther away from my RHP. Both started reading the same. IDK ??? I don't think you can calibrate one of these Acurite's after you do a salt test. I want to find a Hygrometer that can be calibrated. I'm thinking maybe one used for cigar boxes ???
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