0.4 inch 2 digit green led digital thermometer, available to be built in refrig, cooling system, ... thermometer1, supporting the refrigerator, freezer and other needs of temperature measurement products; 2, 0.4 inches green LED digital ... 8, power: AC 110v/220V or DC 15V9, working environment: Temperature -10 ~ 45 , relative humidity from 0 to 95 percent ... . 0.4 inch 2 digit green led digital thermometer