0.4 inch 2 digit green led digital thermometer, available to be built in refrig, cooling system, equipments 0.4 inch 2 digit green led digital thermometer1, supporting the ... ; 6, shows that the temperature accuracy: ± 1 ; 7, resolution: ± 1 ; 8, power: AC 110v/220V or DC 15V9, working environment: Temperature ...