Check the listing for details. Professional Car Spark Plug Tester Ignition System Wires Coil Test Check Pen. Condition: New. Listed at 3.55 USD. Feature： ►High quality insulated handle, Safe and reliable. Used to test spark plugs, coils and breaker. ►High-brightness bulbs and transparent observation windows make test results easier to observe. ►The end with grooves makes the contact area of the wire and instrument larger and the test results more accurate. ►It is more convenient to carry and use without any cables. It is an essential tool for automotive inspection and maintenance. ►How to use: When the engine starts or runs, the end of the test pen is placed on the high voltage line, and the luminous tube will flash indicating the ignition performance. Specifications: Condition: Brand New Material: Aluminum Color: Shown on Picture Length: 12.2 cm/4.8 in Diameter: 1 cm/0.4 in Voltage: 6-24V Fitment: Universal Package Including: 1×Car Circuit Tester