unfortunately inaccurate at the top of

The thermo-hygrometer performed his service at first very reliable and I was also very pleased.
I use it at the top of the relative humidity, so it is fairly constant with me at 99%.
When I noticed that it can not be that the RL is constantly so high I've set up at various locations and found to my regret that I now always 99% RH are displayed, even in places where a maximum of 30% may be ,
The temperature display continues to work reliably, but the main function now falls well flat.
Too bad about the money. Who exposes the device for extended periods of too high humidity seems to probably destroy. I prefer to climb to analog.