As for thermometers, I purchased some of the digital indoor/outdoor thermometers from Wal-Mart for around $9. I keep the unit outside of the bator and set the setting to get "outside" temperature. Compared it with normal incubator thermometer and it is more accurate. Sometimes the mercury in those will seperate, even a very little. This will give false reading. Try the digital, you'll like it. NOTE: I keep the end of the outdoor cable where the center of the eggs are and hold it in place with the vent plug.