DROK Cars Digital Auto Inside Outside Temp Thermometer -55-125&Acirc;&deg;c Blue LED Digital Temperature display Meter DC 12V Power Supply voltage: DC 7-30V ( with anti-reverse protection ) Measuring temperature: -55 to 125c;Display: three 0.56 "LED digital tube Dimensions:48mm x 29mm x 19mm;Cutting Size:45mm x 28mm Sensor: DS18B20, Stainless steel sheath package, waterproof, anti-corrosion, high temperature Uses:for Measure Car, Room, Water, Refrigerator, Aquarium Temperature And DIY Etc