Item No.: B15AP007
.A handy tool to check ignition spark without removing the spark
plug. The tool is specially calibrated to measure ignition voltage.
Works on both standard and electronic  ignition systems. Easy  to
use. Simply adjust calibration screw  to proper gap size. Attach
spark plug wire to end of tester. Clamp tester on engine to
ground. Crank engine and check for spark.