Hi All, As I was having issues keeping humidity up, first thing I had to do is to make sure I get accurate readings. I used the method below to test the accuracy and calibrate the hygromether. I strongly recommend this approach even if you do not have humidity issues (you might be surprised how inaccurate are some devices!). I used it on an analog device. Salt Test - Cigar 101 - Cigars International or How to Test a Hygrometer: 6 Steps (with Pictures) - wikiHow Hope it helps.