Herve's comments about the Digi-key humidity sensors are correct. In fact, finding an affordable, accurate, and reliable sensor for R.H. is surprisingly difficult. We've used more than 100 R.H. sensors, including those mentioned. In fact, I think we've probably sampled nearly everything that Digi-Key offers at some point in time. Having said that, everything gets more complicated inside the beehive, where the environmental conditions are rather severe, and where the bees want to remove or coat with propolis anything unusual in the hive. The one thing that we are sure about, the atmosphere inside a beehive tends to be as humid or more so that that of the exterior environment. Only in our arid west or indoor chambers do we ever have a problem of low humidity. Yes, bees, increase humidity. No, they don't decrease it much, if at all. Jerry :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: -- Visit www.honeybeeworld.com/BEE-L for rules, FAQ and other info --- ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::