A brilliant tool for the auto electrician and mechanic. Carry out the following tests on systems from 6V up to 24V quickly and efficiently: Polarity test. Power? 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. Safe to use around vehicles electronic management systems. Fitted with 4m cable allowing access to the rear of the vehicle and supplied with instructions.Operation voltage: 6-24V DC (The tester needs to be connected to the vehicle battery before it can be used.) Overload protection: 7A (When the current exceeds 7A, this item will disconnect the current automatically.) Material Type: plastic and stainless Cable length: 4M / 157.5inch Item Length: 225mm / 8.85inch Item Width: 30mm / 1.18inch ?1x Electric Circuit Tester 1x Manual