Farm Innovators Model 4200 Circulated Air Incubator with Automatic Egg Turner Easily accomodates up to 41 eggs with the included egg turner Automatic egg turner turns the eggs completely every four hours to eliminate manual handling and improve hatch rate Fan pulls in fresh air to stabilize the temperature and improve hatching Built-in hygrometer measures both internal temperature and relative humidity Two large 9-1/2-inch by 3-1/2-inch viewing windows allow for observation of eggs