I have 3 of them they are wonderful for the humi or any other temp/rh area you want to monitor. One of mine is a couple of years old and still works great. They are usually pretty accurate right out of the of the box too but good idea to verify. Great Value and nice to be able to just walk in a store and buy them without waiting even if you do have to go to Walmart. Here they are on the back wall of the store in the tool section.