Features: High quality insulated handle, Safe and reliable. Used to test spark plugs, coils and-breaker. High-brightness bulbs and-transparent observation window 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: Material:Plastic Length:Approx.4.92inch Voltage: 12V Operating current: < 5.0ma Working voltage: 8-63V Temperature range: 0~40℃ Package Includes: 1x Car Ignition Tester note: ①.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. ②.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings.