For all those new to incubation, I wanted to tell you that the thermometers that come with bators are notoriously inaccurate. They can read as much as 2 degrees off sometimes, completely destroying your eggs. If you just rely on that one and dont check it against another and even a third one, you may be in for a big disappointment come candling day or hatch day. Temps are much more important than humidity. Humidity can vary quite a bit, but not those temps. You can calibrate a hygrometer, too, by placing a cup of 1/4 c. salt in 1/2 c of water inside a plastic ziplock bag with your hygrometer. After at least 8 hours, it should read 75%. If it says, say 80%, you know that it is reading 5% too high and can make the adjustments in your readings.