A brilliant tool for the auto electrician and mechanic. Carry out the following tests on systems from 6 Volt up to 24 Volt quickly and efficiently with LED indicators and audible tone for when the circuit breaker trips. This unit is the best electrical tester for reducing diagnostic time in automotive electrical systems. After a simple hook-up of the unit to the vehicles battery, an automotive technician can conduct a positive or negative battery current to the tip by rocking the power switch forward or backward. The unit is short circuit protected and can test for bad ground contacts instantly. It allows you to follow and locate short circuits. It can also test for continuity with the assistance of its auxiliary ground lead. Comes with a lengthy 5m cable to allow the user to test electrical systems quickly and easily. This unit will make a sound when the circuit breaker trips. Once it trips the unit will reset automatically 3-5 seconds later. Specifications: Operating voltage: 6~24V DC. Cable length: 5m. Overload protected: 8A (the unit disconnects when the current exceeds 8amp). Length: 200mm (including probe). Weight: 340g. Hand held. Applications: Tests for continuity. Tests for polarity of a voltage. Checks lamps. Checks electric motor. Power supply function may be selected. Follow and locate short circuits. Tests for bad ground contacts. Fitted with a sensitive short circuit protection device. Safe to use around vehicles electronic management systems. Polarity Tests Starter solenoids. Cooling fan motors. Fuel pumps. Window/Sunroof motors. Relays and Lamps. Wiper motors. Continuity Tests. Switches. Diodes and Fuses. Relays. Wiring harnesses.