HV Spark Tester is designed for checking the quality of pvc coated or insulated wire online manufacturing unit. The insulated wire is passed through brass ball chains which are carrying high voltage. If any pinhole or fault comes in insulated wire, the spark develops and electromagnet counter counts the fault. The spark tester is therefore necessary for every cable manufacturing unit. Our spark testers upto 15 KV are air cooled (there after for higher capacity transformer is oil cooled and control panel air cooled).