- Insulated handle ensures safety while testing plugs, coils, and breakers, providing peace of mind during electrical diagnostics. - High-brightness bulbs combined with a transparent observation window allow for easy and clear visibility of test results, enhancing accuracy in your evaluations. - Practical application: Simply place the end of the test pen on the high-voltage line when the engine is running to check ignition performance. The luminous tube indicates the condition effectively. - The specially designed end with grooves increases contact area between the wire and instrument, leading to more precise test results. - Ideal for automotive professionals and DIY enthusiasts, this tool is essential for quick diagnostics on ignition systems, electrical connections, and troubleshooting. - Compatibility: Designed for use with various automotive electrical systems, making it a versatile addition to your toolkit. - Compact size and durable materials ensure long-lasting performance and easy storage, making it convenient for both on-the-go and stationary use.