High tension testers suitable for quick checking of petrol H.T systems. Each tester contains a flash tube indicating whether H.T voltage is present. Capable of individual or multiple cylinder fault finding. Compatible with all petrol cylinder types. Not suitable for deep recessed spark plugs. Features and Benefits High tension testers suitable for quick checking on petrol H.T systems Testers contains a flash tube for indicating whether H.T voltage is present Capable of individual or multiple cylinder fault finding Compatible with all petrol cylinder types Not suitable for deep recessed spark plugs Contents 1 x H.T. Tester Set (4 Piece)