New Lisle inline spark/ignition tester. This is a great little tool for testing spark. Simply unplug your spark plug wire from the spark plug, snap the spark plug wire onto the tester, and snap the tester wire on the spark plug. When you crank the motor, the tool will light up if there is spark. The spark is contained into the tester, unlike some of the other tools which can ignite fuel or vapors. Also works on ignition coils that use the generic spark plug style connector.
Works on most Chevrolet, Pontiac, V8, V6, GM, LT1 and LS based engines also. This cannot test the 96-97 LT1 ignition coil.