A brilliant tool for the auto electrician and mechanic. Carry out the following tests on systems from 6Volt up to 24Volt quickly and efficiently: Polarity test. Power up components prior to fitting including: Cooling fan motors Fuel pumps Window/Sunroof motors Relays and Lamps Wiper motors Tests continuity in: Switches Diodes and Fuses Relays Wiring harnesses Detect short circuits. Locate bad earths quickly. Fitted with a sensitive short circuit protection device. Safe to use around vehicle’s electronic management systems. Fitted with 4.5mtr cable allowing access to the rear of the vehicle and supplied with instructions.