• Accurately check for spark in ignition systems without removing spark plug from engine.
• Testers verify that energy is sufficient for spark plug to fire.
• Attach spark plug wire to tester end.
• Clamp tester to engine as ground.
• Crank engine and check for spark.
Warning: This product may expose you to chemicals including lead which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov