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Whats up Dude, Scotty and DGC! I’ll make this a quick one.  I have 2 hygrometers and a dehumidifier reading humidity. One cheap chinese ebay, one active air, and the dehumidifier all read different, about +- 5%. If im going by my gut, i would trust the dehumidifier over the others. The lowest reads 50%(dehumidifier)  and the highest 63%(active air), with the chinese one ranging in between. Also, where are people placing the probes from their readers? Any light that can be shed is greatly appreciated.   -Jaamon