Was purchased this weather station to measure the humidity in the room. It was me not about the accuracy, but the trend: I just wanted to know whether and to what extent the humidity in the bedroom, for example, rises overnight, and as it falls after airing. The machine performs this task perfectly. However, what I as an absolute lack look: the batteries are empty within a few days. Therefore 2 star deduction. Meanwhile, I have found me a biliges China-device, which does not have this shortcoming.