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Specifications : Feature: Multifunction, Time/Voltage/Temperature,3in1 Display: 61x29x17.5mm Installation dimensions: 58x26mm Operating temperature: -40 °c -85 °c Display Color: Green Refresh rate: about 300mS / times Accuracy: about 0.2 °c Overload: please do not higher than 300 °F Sensor Cable Length: 80-100cm Sensor probe:18B20 Application: For measure Car, Room, Water, Refrigerator, Aquarium Temperature And DIY etc Display modes: Only display time Only display the voltage Only display temperature Time temperature voltage alternating display 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: Power Supply + Black: Power Supply -, Measure Voltage - Green: Measure Voltage + Package Includes: 1x Digital Clock Voltmeter Thermometer 3-in-1