Kimdrox Yellow LED Digital Temp Thermometers Sensor DS18b20 -55-125&deg;c Air/Water Temperature Measure Dimensions : 33mm x 24mm x 17.5mm;Installation dimensions: 30mm x 21mm;Sensor cable length: 3 meters Power Supply voltage: DC 7-30V ( with anti-reverse protection ) Measuring temperature: -55 to 125c;Minimum input: -55 c;Maximum Input: 125 c Units of measurement: " c ";Display color: Yellow; Display: three 0.36 "LED digital tube Refresh rate: about 300mS / times;Accuracy: about 0.2 c;Operating temperature: -40 c -85 c