2 in 1 Voltmeter + Thermometer for Auto Car Truck Bus Motorcycle Battery Voltage Temperature Digital Monitor Gauge Meter Test with Dual LED Display DC 12V 24V Dual Functions: Simultaneously display the vehicle temperature (-10℃ to 80℃) and the car battery voltage. Safety: Built-in fuse allows safe use. - With external and foldable temperature sensor. Easy to use: No battery required, just plug the product into the car cigarette lighter socket. Dual LED screen blue and red, - With high brightness LED, clearly visible on the display.