Sealey auto probe with lcd display 12 42v sealey pp7 a range of functions allow automotive electricians and mechanics the ability to effectively diagnose short circuits and bad earths the 4 6mtr lead connects to a 12v battery supply and reaches to all areas of the vehicle fly lead allows continuity and polarity testing with a high contrast lcd display with 9mm high 12v to 42v read out activate components in situ or prior to installation features audible and positive negative voltage ind