These little helpers I give her no longer as fast. Because with us the air is very dry and I need the real room temperature, since I bought the Heizungstermostate of EQ3, I had to look around for hygrometers. Most offered here are probably very inaccurate, according Vorkäufern. These here are accurate and do not fall on account of their size. The price is actually compared to other products offered here even low. But because of the size (smaller than a matchbox) you can just get the impression of overpricing. Thus, now I think by water containers on the radiators now the humidity between 40-52% and could therefore also my heating thermostats in IS-Temp. Set. 100% buy recommendation!