Display Color: redDisplay Way: 0.28 inch LED digital tube Display: DigitalRefresh Rate: 4s/times Unit Quantity: 1PcMeasurement Precision: 1 celsius Operating Temperature: -40~85 celsiusShell Size: 47.8*28.8*15mmSensor Type: NTC metal waterproof probe Supply Voltage: DC 4-28VMinimum Resolution: 0.1 celsius Measurement Temperature: -20~100 celsiusColor: BlackMaterial: ABSnstructions for use:[1] DC supply: This product requires access 4-28V DC supply, the for positive supply, the black wire to the negative . The greatest feature of this product: its own reverse anti-burning circuit, avoiding the user process due to improper operation problems. Friendly reminder: must not be connected with AC 220V Oh [2] Display Description: When the temperature sensor is removed when the digital display "- - -", the temperature is below -20 Celsius or above 100 Celsius , digital also shows "- - -."[3] Acquisition normal temperature range: -20 Celsius to 100 Celsius , resolution 0.1 Celsius , accuracy of 1 Celsius .Product Usage:measuring the temperature inside and outside the carmeasuring the temperature inside and outside the -conditioned roommeasuring the temperature inside and outside the refrigeratortemperature measurement pondbaby bath water temperature measurementPackage contents:1x monitor2x 1M NTC waterproof metal probe1x WiringOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.