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 Inline Spark Plug Tester, Plug-in Engine Ignition Car 1, 1
SINGARO Inline Spark Plug Tester, Plug-in Engine Ignition Tester, Car Exterior A
SINGARO 2PCS Inline Spark Plug Tester, Plug-in Engine Ignition 2, 2
