This is the second time we redeem this thermometer that seems unreliable. The first time he stopped to work after a few weeks. I put this down to the batteries that I changed. Ten days after the death voila ... He had taken water (although I had yet closed the battery cover taking care of the seal). The second time, I did not even have to change the batteries: he died before ... At the opening of the battery compartment, they were wet ... I said that in both instances the use was normal, that is, on the surface, in the small tub of my daughter. There will be no third time ... I will turn to another brand and I suggest you do the same!