Pointer Type Spark Tester for wire and cable is a necessary test equipment for wire and cable manufacturing process and using high voltage to test the insulation quality. The EDM sensitivity <600μA, UL1581-1990 requires the series of sparks machine using epoxy casting high-voltage transformer,moisture-proof performance, strong anti-interference ability, , they can always check the work is normal with self-test button (breakdown, count , sound and light alarm) to ensure test accuracy.