Hygrometer calibration

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Everyone, Registered Users Posts: 5
Hi guys, new to all of this so if this sounds stupid please forgive me. I have been trying to calibrate 2 new and 2 old hygrometers and get different readings every time. Doing the salt test and watching the hygros after an hour the reading is about 80%. After 3 hours the reading comes down to about 73%. Is that normal for it to go up and down in the plastic bag? Thanks for any replies

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