GearWrench 2757D Standard Ignition Tester

Accurately check for spark in ignition systems without removing spark plug from engine Testers verify that energy is sufficient for spark plug to fire Save weight in your toolbox by combining 2 sizes on one wrench Cleaning dirt and debris from the ratcheting mechanism is easy Bright, full polish chrome finish easily wipes clean and resists corrosion Laminated construction for greater strength Manufactured from alloy steel for better strength and longer tool life Attach spark plug wire to tester end Clamp tester to engine as ground Crank engine and check for spark 40,000 volt systems 12KV