100% brand new and high quality Using Introduction: 1.DC Power Supply: this product needs to connect with DC 4-28V power; red wire connects with power positive,black wire connects with power negative. 2.Display: when take off temperature sensor,digital tube will display "- - -"; when temperature is lower than -20 celsius or higher than 100 celsius, digital tube will also display "- - -". 3.Normal Temperature Collection Range: -20~100 celsius. Applications: 1.Measure car internal and external temeprature 2.Measure air conditioned room indoor and outdoor temperature 3.Measure refrigerator internal and external temeperature 4.Measure fish pond water temperature 5.Measure infant bath water temperature Specification: Power Supply Voltage: DC 4-28V Measurement Temperature: -20~100 Display Color: red + blue Display Way: 0.28 LED Refresh Rate: 1s/one time Measurement Precision: 1 Operating Temperature: -40~80 Sensor Type: 1m NTC waterproof metal probe Minimum Resolution: 0.1 Material: Plastic & metal Dimensions: 48x29mm/1.89x1.14inch Quantity: 1 Set Note: 1.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you Package includes: 1 x Digital Thermometer 2 x Waterproof Metal Probe 1 x Power Supply Cable