http://www.ebay.ca/itm/Digital-Therm...#ht_4837wt_993
spec'd at twice as good as an accurite. (+/-2ºC for accurite this is 1ºC) you could buy 4 for the same price check all 4 against each other and only use the ones that read the same I suggest this method with accurites too buy at least 3 and 5 is better and check them against each other. Digital hygrometers are actually not very appropriate to enclosure. They are very sensitive to dirt debris and are quite fragile. Why they are so often incorrect. (add the accuracy is terrible, accurites are spec'd at 10% rh ie if it reads 60% it could be 50-70% if it is working as well as the manufacturer thinks it will.)
http://www.amazon.com/Analog-Hygrome...gue+hygrometer
It is certified, calibrate able resistant to dirt and dust. I have checked over 40 now (28 for a zoo) and all out of the box were with in 9%RH of correct, all held correct (+/-2%) for two weeks. Mine hold accurate (I own 12) for 6 months (+/-3%) when I re calibrate them all. The three accurites I owned two were OUTSIDE the specs for temp (more than 4º off) and the other one was just on it (3 and change high) all three were inside the 10% RH but on the edge 7-9%. People define accurate differently, recently I had someone say that 6º off of correct was fine. Personally I can live with 1º more I cannot accept. It was a struggle to tolerate 1ºF in my work 0.5ºF is a unacceptable.
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