I have a digital thermometer/hygrometer that reads relative humidity. It's made for use in the home, but I've had success using it to incubate in the past. I actaully keep a pair running in there at all times, just to be *sure* I'm getting accurate readings. I'm having trouble finding a list of humidity requirements for incubation for all the different kinds of poultry that I raise - Ducks, Muscovies, chickens, guineas, and geese. It seems I can find wet bulb or dry bulb requirements. Any links to good websites? Or, is there an equation I can use that relates relative humidity to the other humidity values? I plan on printing out this information and keeping it with my incubator. Thanks!