A brilliant tool for the auto electrician & mechanic. Fitted with 4.5m cable allowing access to the rear of the vehicle & supplied with instructions. 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.