I'm using a thermometer that's got a built in hygrometer. You can pick them up at WalMart for less than $25...they're digital, and mine runs on a couple of AAA batteries. You can pick up an analog one at PetSmart for a couple of bucks. They're less accurate, but they do seem to measure ranges effectively. I'm keeping my clutch (I only have one) in damp sphagnum moss. I wetted it then wrung it out so that it was moist, not wet. I have holes for airflow in the container they're in, but not so many that I lost much moisture. I've only had to add water once, but I'm not using a commercial incubator.