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I did that...it says its at 81% is it possible to be that much off?! accurite

Ok, I have two acurite thermo/hygrometer and a petsmart brand along with another brand of hygrometer/hydrometer, basically i'm getting really bad readings one says 35% another says 59% another says 64%.....jeeze lol, so I'm wondering what kinda hygrometer should I buy thats the most accurate...