DROK Small Digital Volt Temp Multimeter Red/Green LED Panel Voltmeter Celsius Thermometer Multiple Tester 12V/24V Car Battery Voltage Monitor -10~80  Temperature Testing Meter 2in1 Cigarette Lighter Plug Can display car battery voltage and temperature simultaneously(read in Celsius). Its external temp sensor allows you to bend it to avoid possible heating to get accurate reading. The monitor has built-in fuse, it is safe to use and causing no damage to your car. The screen is made of LED material, so it is easy and convenient to read even in dim light.