DROK® Fahrenheit °F Panel Thermometer DC 12V Voltmeter Temp/volt Gauge Green LED Digital Electronic Clock 18B20 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
Clock: 12-hour, 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