A must-have for accuracy for any incubator! The GQF 3520 Thermometer/Hygrometer is specifically designed for poultry incubation and therefore the temperature range is only displayed between 90-109 degrees F (32-42 degrees C) and is exceptionally accurate. The temperature probe is hermetically sealed to prevent water damage and has an 18" lead wire that will fit a 1/8" to 5/32" hold.