I bought 2 pieces, have both 5h are nebereinander had and they still had 7% difference in Hygrowert gehabt.Der temperature difference was 0.9 c. Due to the many positieven opinions about the device, it may be that I one or two "Monday device (s)" this habe.Ach yes the Smeilis both devices go only when she laughs a wollen.Der only at exactly 50% humidity, the other not at all .Since I in my house have large rooms that are connected to each other partly open and the independent air circulation required soft values anyway always something ab.Somit each other I have both also with their quirks behalten.Gut I find and add different suspension vorichtung with magnetic and away.The optics and workmanship is good.