Adjustable Spark Plug Tester - Flexible Lead

Flexible lead type spark plug tester Test for non-start conditions and for spark strength Simulates spark plug under compression load Standard ignition minimum spark plug gap indicated by 'S' Electronic ignition minimum gap (10mm) indicated by 'E' When gauging voltage turn tester screw counter-clockwise to increase gap 2kV marking: (2/0) 3kV marking: (3/0) 4 kV marking: (4/0)