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This hygrometer is perfect. It's small and simple and works perfectly. Bought this as a replacement for the analog hygrometer that came with my humidor. It is a lot more accurate than the analog.
I purchased this and did the salt calibration. This is the easiest unit to adjust. It's very straight forward.
Awesome product that works excellent!
Calibration adjustment unreliable IMHO. I own 5 of these and have spent all weekend trying to calibrate them all at once using the damp salt method. One click on the calibration dial might result in one percent change in humidity reading or it might jump 6 percent. I gave up and declared Victory when I got all 5 to read 75% +/- 2% humidity at the same time in the same zip lock bag! I wasn't expecting scientific accuracy but I did expect more consistent results. Temp readings were always 1-2 degrees of each other.