I bought a pound of 65% RH beads and humidity sheets about 2 years ago from Heartfelt and while they did not sit exactly at 65%, they were painless and only required care once in a blue moon. Recently I noticed my 2 digital hygrometers reading in the 70% range and figured it was the hygrometers. I replaced the batteries in each, salt tested them, and stuck them back in. They again read 70%. I notified David about the problem I was having and he sent out another pound of beads to replace the problematic ones. I bought another, of a different style, hygrometer and a Boveda calibrating bag. I took all 3 hygrometers, salt tested them for 48 hrs and then stuck them in the Boveda for another 48 hrs. After validating the calibration with the Boveda, I stuck all three meters in with the new beads. After another 48 hrs they read 70% RH with the new beads. I sent Dave a note to see if he could track this down on his side but was curious if anyone else has experienced similar issues?
-Chad
-Chad