On calibrating the hygrometer, what do you do if it is off? Buy another one?
I have Accurite brand and it seems to work alright. I have a barometer, temp/humidity gauge outside of the bator we have had for years and the Accurite seems to read the same when it is outside as it does, so I'm thinking it is ok.
Mine is one of those coiled wire ones.......
either subtract or add what it is off to your reading if you cant adjust it