It's that time of year again (at least, in the northeast US) where we have to start watching the hygrometers. One thing that I've found to be somewhat of an annoyance over the years is that if a humidifier has a humidistat at all, it's not usually very useful (the humidity swing it allows, i.e., "the differential," is usually too great) and to get a humidifer with such a control usually means you have to spend more. Enter the Dayton plug-in humidistat. This little gem combines a hygrometer and humidistat with a claimed +/-1% differential. Sure, it's $50 but you can combine it with an inexpensive evaporative humidifier and you're good to go. If the humidifier ever craps out, just get another inexpensive one. The control should go on and on. Yup, there's one plugged into the wall where my bass lives.