I must first say that the device is just great and very easy to use. Ok bissl exercise needs it right until you get the hang has with the measurements, but happy you almost always super. That's right almost always. It can sometimes happen that one does not measure correctly, a measuring result gets what is not correct properly. Therefore I do not understand here some recessions. People who write incorrect values, etc. right to left ear. So I had a difference of 0.1 degrees Celsius. And folks, in the manual does it say that may be right for left ear abnormalities. You should always use the same ear for measuring. I have used such a similar device in the hospital as Zivi in the patients and you have to really learn it only when you measure others. Is not always easy. As well happen wrong measurements, then repeating halt rather again. Even after more than 1 year of daily use does that happen sometimes. So if here who have the equipment and say after 3 weeks does not always work .... Well, does not want me to comment. As I said, am very satisfied with the device and the functioning and operation of, and would highly recommend it. Simple and foolproof. And it is clear that it is not suitable for babies special only if the children are a bit older. I hope I could help some.