Product Specifications: Model: Adjustable Auto Electric Coil Tester Coil Ignition System Diagnostic Test Tool Weight: 0.2kg Material: Plastic + Metal Color: Black Jump Distance: 0.8-1.5cm Package Contents: 1 x Spark Plug Tester with Cable. Features: Simply connect the spark plug and spark plug wire, screw assembly for quick and easy spark gap adjustment. It can quickly and easily diagnose whether a car's ignition system is working properly. Avoid fires, ignition coil burns, etc. The normal spark plug is blue-purple, and the straight line is two centimeters long. If it is red or crooked, the ignition coil is faulty. Suitable for all internal combustion engines, cars, trucks, motorcycles, lawn mowers, chainsaws, trimmers, snow blowers, generators, etc. Product Description: Material: Made of high-quality plastic + metal, durable. Function: Can quickly and easily diagnose whether the car's ignition system is working properly. Avoid fires, ignition coil burns, etc. The test shows that the normal spark plug is "purple-blue, the straight line is two centimeters long", if it is red or crooked, the ignition coil is not good. Application: Suitable for all internal combustion engines, cars, trucks, motorcycles, chainsaws, trimmers, snow blowers, generators, etc. luckymeet