This transparent top incubator has a fan to ensure uniform temperature and calibrated air renewal. The temperature is controlled by a wafer thermostat ( T7 ); a thermometer is also included. It is possible to buy an optional automatic turner ( 1610 , 1611 , 1612 or 1614 ) and a hygrometer ( TM9HG ) to measure humidity. The capacity of the incubator is 42 chicken eggs or a larger quantity of smaller eggs.