Hi,
I was told by a cigar shop to recalibrate your hygrometer. This is what the cigar shop told me to do.

"A simple test which will recalibrate you hygrometer, wrap the hygrometer in a damp cloth for half hour and the reading should be 100%. If not adjust the hygrometer dial to read 100% and place it back in the humidor, this should then give you an accurate reading. You should recalibrate your hygrometer every six months"


I wrapped the hygrometer in a damp cloth for half hour but I could only get the reading to 92.

Is that ok? Also how do I adjust the hygrometer dial to read 100%?