75-80% humidity in my music room of 16 square meters: the keys of guitars, violins back of the head. An Internet flick, forum, testing, comparative and Trotec brand for the German air quality control devices seems to stand: for the size of my room, the newest and best equipped is the TTK31. Oops, Amazon appreciations thin. Too bad, I ordered from Trotec (they sell directly). Three days later, I have the camera. I read the instructions directly from the Internet (not hard to find!). I plug. I active. Everything works. Well, it's super effective. So much so that the internal tank fills in a day: safety plays its role: the device stops by itself full tank. Good. I plug the supplied hose and directs it to a personal external tank of 10 liters. All right, I have only to empty the every 4-6 days. I try all modes: auto, do not worry, low, the fan is less audible, high, mmmmm ... it meant a lot. Conclusion: great. I apparently was lucky because none of the other problems mentioned in assessments. Well, to revalidate in six months for reliability. But, for me, a very good buy. Alain Michon