Product review (3 stars): is good but the humidity is 13% off
It works. The temp. is good but the humidity is 13% off. That is ok provided that you keep a log of the deviation by unit. Calibrate: tbl spoon salt in small cup, add a small amount of water (make a slurry not soup), put the cup and the hygrometer in a plastic bag, should read 75%. Good luck!