Damp Salt for Hygrometer Calibration
Does this mixture really measure 75% humidity? I have both an analog and a digital hygrometer I'm attempting to calibrate in a bag along with the damp salt. They've been sitting in there for 24 hours and they are both reading 70%. So what should I do? Should I adjust the digital hygro and increase it 5% and make note of the analog hygro needing a 5% correction? Mmm... any advice would be nice. Thanks all.