My homemade "lame water heater thermostat" incubator has been rockin steady with my simulated egg temp right at 99.4/99.5 Humidity stays right around 50-55%. Adding a larger tray bumps it up towrd 70% humidity. It's been on it's test run for about three weeks now. I put 18 nice eggs from my Easter Eggers in this afternoon! Wish us luck and fuzzy butts!!! PawPaws to the People!