Oh this is the hygrometer I have settled on. I bought ten and tested all ten and found them all to be with in 2% of correct. I adjusted them and yesterday after 3 months of use I checked 4 and they were still spot on. The magnet sucks I tossed it away and replaced it with a rare earth one that has been working much better (instrument inside magnet outside) The metal ring on the back came unglued on 6 of them I used hot melt to re attach it.

http://www.youtube.com/watch?v=1AMyVUx0Y60

It is around 9$ each. The digital one I also bought this a hygrometer it was also within 1% and is also quite good the temp is better than some but still is out the one I had was +1.3ºF The problem I had is the adjust dial on the front moves easily (I only bought one) and was reading very badly after the second night I have a feeling that my nosey male did his own adjustment (way off, it went from 66% to 9% over night). It has a sticky pad on the back that I stuck a metal washed to and used a magnet to hold it in place. I am using it in my snake room it works great I have thought about gluing the adjustment dial and trying it again but it is 20$ + shipping or 45$ local and I am happy with the brass one so I have not bothered trying.


http://www.shopwiki.com/_HygroSet-II...94390&s=206383