Feature: Brand new and high quality Support short-circuit and open-circuit test, ignition system test,engine percompatible withmance test, charging system test, automobile battery percompatible withmance test, circuit polarity discrimination test. It can be used compatible with cars, motorcycles, bulldozers, rollers, excavators and other transport aircraft maintenance operations. It is flexible and does not decompatible withm easily. It is easy to operate with the pen shape. Digital display allows you to see the voltage more clearly. Needle test head can be conveniently connected to the clamp. Designed to detect low-voltage circuit faults in transportation machinery. Indicator design is helpful to detect the positive and negative poles of the battery or circuit. Specification: Voltage test range:2.5-32V Material:Plastic + Metal Display:Digital LCD Screen Size:17.5cm/6.89inch. Cable Length:Max.2.4m Package Included: 1 x Car Electrical Circuit Test Pen