I have a HygroSet round adjustable digital hygrometer that I've tried to Calibrate using the salt test. I've followed the instruction of using a bottle top filled with salt that is damped and not soaked. After leaving it for 6 hours to started and then over night the highest I could get it to read is around 38 and 39%. I have turned the dial both ways and still the highest is 38 or 39. Can anyone tell me how to set it or do I have to buy another one. The one that I have it the one picture here
http://www.cigarmony.com/index.asp?P...PROD&ProdID=81