Hello fellow cigar enthusiasts, I have a quick question that I am having a problem with. I have two hygrometers that I have had stored away for a while and decided to calibrate them and make sure they are accurate. I did the salt test and after a 8-24hr period I checked the readings. One was reading 64 and the other was 69%. I know the humidity levels out at 75% in the bag, Let's take the 69% one for example. Do I add the 6 to get an accurate reading of 75%? Or do I assume it is at 75% but reading 69% so I would subtract let's say 5 or more to get to an accurate reading of 70% or below that I am aiming for?