Durable styrofoam incubators from miller little giant help keep warmth and maintain a constant temperature. Features two 4 x 8 viewing windows, solid state thermostat control, thermometer and moisture channels. Digital still air incubator features wire mesh screen for egg hatching support, digital control board for easy temperature setting, and built in digital hygrometer to measure humidity. Self regulating temperature control helps maintain a consistent temperature. lcd display with led light instantly shows accurate readings. Plastic screen for easy cleaning won it rust or warp. Holds 41 large chicken eggs or up to 120 smaller eggs when used with the automatic egg turner and small egg rail .