Puretronics offers Spark Testers for extrusion and rewind lines to check for defects in cable insulation. Cable passes through a high-voltage bead chain electrode in the spark tester, and any insulation fault causes a spark from this electrode is grounded via cable core. Any spark detected by spark tester is registered as a fault. By using spark testers at extrusion or rewind lines,  cable product can be monitored. If there is any fault in cable insulation,   the spark tester will warn by its alarm and you can search the possible cause and fix the problem, so you get product without any faults.