RE High voltage spark testers are designed for checking the quality of insulation coated wires for pin holes / weak insulation / exposed conductor during manufacturing at work floor. The wire is passed through brass ball beads which carry high voltage. If any pin hole is detected in PVC, a spark develops and electro magnetic counter counts the fault. The spark tester is necessary for every cable manufacturing unit. Spark Testers can be used for high speed extruders and high speed Recoiling processes. The efficiency of Spark Tester is up to 95%.