DROK Fahrenheit Scale 0.56 Inches DC 12V Digital Car Clock Thermometer Voltmeter 3in1 Red LED Auto Gauges DS18b20 Probe

Parameters: Power Supply voltage: DC 7-30V (with anti-reverse protection) Display: four 0. 56 "LED digital tube Refresh rate: about 300mS / times Accuracy: about 0. 2 °c Overload: please do not higher than 300 °F Measuring temperature: -67°F to 257°F Operating temperature: -40 °c -85 °c Sensor cable length: 80-100cm Sensor probe: 18B20 Measuring voltage: range 0-200VDC , accuracy +/-0. 1V The battery backup is available for 3-4 years Display: 61x29x17. 5mm Installation dimensions: 58x26mm Some application: for measuring car, room, water, refrigerator, aquarium temperature and DIY etc. Display modes: Only display time Only display voltage Only display temperature Time, temperature, voltage display alternately Mode setting button: Short press to select the clock, seconds, voltage, temperature display mode; Long press show "ALL", Enter the time temperature voltage alternating display mode interval of 5 seconds. short press to exit Time setting button: Short press to adjust the hours, minutes (flashing), Short press again to exit Short press the "Mode setting button", the clock starts running Wiring of voltage measure: Red: the positive of power supply Black: the negative of power supply or that of measured voltage Green: the positive of measured voltage Package includes: 1x Digital clock voltmeter thermometer 3-in-1