Unfortunately, since ~ 1.5 months, the display is no longer usable: Some strokes are apparently no longer controlled or are simply defective, what is wrong? No idea - direct moisture (ie splashes) the thing has not really gotten can only imagine that it was the high humidity in the bathroom not coped well with what would take the hygrometer's livelihood.
One can argue that the thing's only 7 cost - what you want as expected in terms of quality? Since sending in the manufacturer also costs money (shipping), it's probably better to leave it be.
Pay me now probably a cheap machine from China to buy for $ 1.85. If that keeps the time, does that. Quality is finally buys apparently in TFA did not.
Update 30.06.2015: After my hygrometer from China has arrived and now for months giving good service, I can say that the TFA thing his money is not worth it really. My China hygrometer shows exactly the same values as my broken TFA Moxx, only the display is significantly worse. For the China-device costs only $ 1.85.