1.This digital gauge displays the voltage of batteries in the car2.With high brightness of LED(light-emitting diode)there is no difficulity in seeing the displayInstallment:3.Clean the cigar socket4.insert the jack of the product into a cigar socketWhat kinds of batteries is healthy5.when engine

1.This digital gauge displays the voltage of batteries in the car2.With high brightness of LED(light-emitting diode)there is no difficulity in seeing the displayInstallment:3.Clean the cigar socket4.insert the jack of the product into a cigar socketWhat kinds of batteries is healthy5.when engine running(do not drive),the  LED display: Batween 13.5 to 14.5(12V CAR)Batween 26.0 to 28.0(24V CAR)6.With the engine off,and nothing turned on,the LED display:greater than 12.0(12V CAR) OR 24.0(24V CAR)Attenion:7.For DC 12V or 24V CAR8.Measuring range:DC 8V-30v /-1.2%