I am happy I also bought the calibration kit, because the hygrometer I received was off by 2%. It was easy to calibrate and now it works just fine.

I live in Florida, so I have a dehumidifier to help the air conditionning without freezing. This simple gauge helps verify the humidity and temperature in different rooms. It is adjustable.

Unfortunately, this hygrometer requires on site calibration to work properly. I put it into a water saturated environment and it read 80% humidity. Coming back to this site, I realize I should have bought the calibration kit that the manufacturer offers. The shipping charge makes the whole endeavor a wash. I'll probably throw the thing away. Bottom line, if you buy this product, get the calibration kit at the same time. Hopefully that will make it worthwhile.

If you need a really nice little digital humidity checker for your humidors, I like this little item. I took it out of the box, pulled the tab, put it in my humidor and in an hour I had a reading exactly like my fixed hygrometer. I want a couple more of these for my smaller humidors. The seller was really great. I had the item in half the time I expected and everything was packed well to arrive here safe. Buy the item and use this seller for your needs. I can't recommend this product and the seller high enough.

Keeps tobacco fresh and not firewood. Check every 7 days in MS, pretty humid here though.