1Spark plug tester can provide rapid diagnostic support for all ignition systems problems testing. 2Simple to operate, just connect the tool between the spark plug and the plug wire. 3The normal spark of the ignition coil is like "purple blue and 2 cm straight line", the color will becomes red or curved when it becomes worse. 4Transparent viewing window design, convenient to observe the jumping situation and confirm whether it is normal and easy to use. 5Comes with grounded clip for firm fixing, a anti-rust rubber sleeve for easy use. 6Use alloy material to connect the high?pressure connector, strong and durable.1 xSpark Plug TesterItem Type: Spark Plug Tester_x000D_Material: ABS + Aluminium Alloy_x000D_Fitment: Universal 1Spark plug tester can provide rapid diagnostic support for all ignition systems problems testing. 2Simple to operate, just connect the tool between the spark plug and the plug wire. 3The normal spark of the ignition coil is like "purple blue and 2 cm straight line", the color will becomes red or curved when it becomes worse. 4Transparent viewing window design, convenient to observe the jumping situation and confirm whether it is normal and easy to use. 5Comes with grounded clip for firm fixing, a anti-rust rubber sleeve for easy use. 6Use alloy material to connect the high?pressure connector, strong and durable.1 xSpark Plug Tester