Product review (4 stars): Great for the money!
I purchased a couple of these for my humidor at home. When they arrived I performed a salt test and noticed that one was 2% over 75% and the other was 6 over 75%. I added a tiny label to each so I'd know how to calculate the correct humidity in the future. I'm giving this 4 stars instead of 5 since you need to pay extra to have it read out in degrees F, this is a standard feature in every other humidity gauge i have.

As it stands now, I've owned these for a few months and they're still going strong.