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INSTANT POLARITY CHECK — touch the probe to a wire, terminal or connector and read the red or green LED to identify positive, negative or open circuits without needing a digital display. POWER OR GROUND AT THE TIP — use the rocker switch to apply battery power or ground directly through the probe, helping activate lamps, motors, relays and solenoids during 6V and 12V vehicle checks. CONTINUITY AND EARTH TESTING — check switches, fuses, relays, diodes and wires between the auxiliary ground lead and probe tip, with the green LED helping confirm continuity or locate poor grounds. SIMPLE 6-12V VEHICLE USE — designed for 6V and 12V DC automotive systems, including classic cars, motorcycles, trailers, vans and everyday workshop electrical fault-finding. PROTECTED BASIC TOOL — short-circuit protection with auto-reset breaker, separate red and green LEDs, switch latch, 6 m (20 ft) lead and removable 4 mm banana tip for compatible leads and adaptors.