Expanded Voltage Capacity & Extensive Use: Electrical tester features a wider testing range of 5V-90V, quickly tests car battery voltage and diagnoses issues, including alternator tester functionality for car/truck/SUV/boat charging systems. Also to inspect circuit tester integrity of headlights, taillights, fuse connections and more.

LED Digital Display: Automotive circuit tester with LED digital voltage display for accurate volt readouts. Compared with LCD lights, LED lights are not affected by the brightness of light, so that be clearly read in daytime or dark areas.

Flexible Spring Wire & Large Alligator Clip: High quality 90.5 inch long enough spring wire increases flexibility when testing and anti-bending design of the tail wire makes no worry about bad contact of the line. Attaching with large size crocodile clip for convenient one-handed operation, which is boosting the efficiency for car battery capacity checks and beyond.

Bidirectional indicating light: There is a bidirectional light emitting diode on the circuit board for polarity indication, red light indicates positive polarity & green light indicates negative polarity. You can attach the alligator clamp either to negative or positive ground, while using the probe to touch the other side.

Widely Use: This auto electric tester pen is ideal for checking various vehicles electrical circuits. Sharp long probe is used to pierce wires and reach into narrow areas, quickly check automotive headlights, taillights, turn signal circuits, faulty sockets, connections, fuses, broken wires and more, suitable for your daily use.