<b>Spark Plug Engine Ignition Tester <b><br> -FUNCTION: <br> The engine spark tester is a diagnostic tool for any engine with a spark plug, which can quickly and easily diagnose ignition/engine outboard motor issues or a fault in the fuel delivery system. <br> <br> -APPLICATION: <br> For all internal & external combustion engines, cars, trucks, motorcycles, lawnmowers, chainsaws, trimmers, snow-blowers, generators etc. <br> <b>SIZE<b> <br> Product size：29.5cm/11.6in <br> Weight：60g <br> <b>HOW TO USE: <b> <br> Simply connect the tester between the spark plug and the plug wire, if spark is being sent, the tester will mirror the spark and light up - Find dirty spark plugs, defective points, bad cables or connections, etc. <br> <br> <b>PACKING LIST <b><br> 1 x Engine Spark Tester