A brilliant tool for the auto electrician & mechanic. Carry out the following tests on systems from 6V up to 24V quickly & efficiently: Polarity test. Power up components prior to fitting including: - Cooling fan motors - Fuel pumps - Window/ Sunroof motors - Relays & Lamps - Wiper motors Tests continuity in: - Switches - Diodes & 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 & supplied with instructions.