I said I would post again after 24 hours. It has been that and more. The Govee is reading 66.8% at 71F, the Boveda says 65% at 70F, and they are side by side in a wooden humidor. The HygroSet ii that was reading 63% in that humidor, settled in at 66% in the 75% calibration kit. Not sure yet if it was badly of calibration, or needs to be tossed. I adjusted it and put it back in the calibration kit.