Locate bad earths quickly and carry out polarity tests with this Sealey auto probe The Sealey PPX has all of the features of the Auto Probe but with an integral work light to aid use in dark engine bays plus an audible circuit tester for when the LED on the probe cannot be seen. The PPX is safe to use around a vehicle\'s electronic management systems and is fitted with a sensitive short circuit protection device. Features: Locate bad earths quickly A brilliant tool for the auto electrician and mechanic Fitted with a sensitive short circuit protection device Safe to use around vehicle\'s electronic management systems All the features of the Auto Probe but with an integral work light to aid use in dark engine bays plus an audible circuit tester for when the LED on the probe cannot be seen Power switch self test means no need to: » Double check your circuit, tester on the vehicle\'s battery. » Reconnect hook-up clips to test polarity. » Search for earth points. » Burn out fuses locating faults. » Run voltage drop tests Carry out the following tests on systems from 6V up to 24V quickly and efficiently: Polarity test Detect short circuits Tests continuity in: » Switches » Diodes and Fuses » Relays » Wiring harnesses Power up components prior to fitting including: » Cooling fan motors » Fuel pumps » Window/Sunroof motors » Relays and Lamps » Wiper motors Comes With: 4.5-metre cable allowing access to the rear of the vehicle