A brilliant tool for the auto electrician and mechanic. Fitted with 4.5m cable allowing access to the rear of the vehicle and supplied with instructions. Carry out the following tests on systems from 6V up to 24V 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.