Simple thermometer, correct values

For our cellar I ordered three hygrometer thermometer /. I wanted to measure the humidity of having to always wear without my previous hygrometer from room to room.
After unpacking the values ​​were of course different, but after about an hour, all three - juxtaposed outside - about the same values ​​+ - (s. Photo) 1 degree display. In the humidity of 4% was higher than the other two. No problem, just in case one is different, they can be easily calibrated using the screwdriver. There are indeed different. Procedures ... I have compared it with my old as well as the local weather station.
Benefits:
good size
easy to read
suspendable
no batteries
favorable