Product review (5 stars): Crazy Dave's Kitchen - Highly Recommends These !!!!
The best hygrometer out there. I have never had to calibrate them, they are pretty accurate compared to my other calibrated hygometers. I like these as I use them in my dry age fridge. Never has the screen gone out like  Thermo pro and Accurite. I used to buy a bunch of Thermo Pro and Accurite because they'd break all the time. Inkbird has yet to fail me. I have 1 on each shelf in my fridge and i highly recommend these for anyone.