Thermometer for refrigerator and freezer Master Class with an elegant polished stainless steel casing and the option to hang it inside the refrigerator or place it upright on the refrigerator or freezer shelf. The large easy-to-read dial measures temperatures from -30°C to 30°C and -20°F to 80°F, and even includes color-coded temperature zones for deep freezing, freezing, ideal storage, and warm. The acceptable temperature range for refrigerator storage is 2°C to 4°C and 35°F to 40°F. Monitoring the temperature helps keep food fresh and usable for longer. Only clean with a cloth.