If the engine can emit spark, the tester bulb reflects the spark and lights up, so as to quickly find the fault point and bad circuit of the spark plug.
SINGARO 2PCS Inline Spark Plug Tester, Plug-in Engine Ignition 2, 2
2PCS Inline Spark Plug Tester, Plug-in Engine Ignition Tester, Car ExterColor: 2
2PCS Inline Spark Plug Tester, Straight Boot Ignition Coil Diagnostic Size: 2PCS
