3in1 Dual Digital LED Car USB Charger Voltage 10-170  Temperature Monitor Tester Multimeter Car Motorcycle Battery Voltmeter Thermometer Detector Dual-display: it can display Auto battery Voltage and temperature inside the car simultaneously(this is for Fahrenheit) External temp sensor: its external temp sensor allows you to Bend sensor to avoid possible heating/ direct sunshine so that you can acquire more accurate results Safe usage: the monitor has built-in fuse, making safe usage possible and causing No damage to your car Easy reading: it screen is Made of LED material, hence it is easy and convenient for you to read even in Dim light