Are you using a hygrometer marketed for the pet industry or a calibrated one?
I've replaced my pet ones for humidor hygrometers that can be calibrated.
I like the Silver Caliber 4R for its +/- 1% accuracy and the easy to read color range that covers most CP's. Supposedly arrived calibrated. I still went through the no brainer steps to verify, and both units now read the same.
As with any Hygrometer, don't soak it or its remote sensor.
I've replaced my pet ones for humidor hygrometers that can be calibrated.
I like the Silver Caliber 4R for its +/- 1% accuracy and the easy to read color range that covers most CP's. Supposedly arrived calibrated. I still went through the no brainer steps to verify, and both units now read the same.
As with any Hygrometer, don't soak it or its remote sensor.