High Voltage Tester, also known as portable AC and DC high voltage withstand voltage tester. According to its function, it can be called electrical insulation strength tester, dielectric strength tester, etc. Its working principle is to apply a voltage higher than normal operation to the insulator of the device under test for a specified period of time. The voltage applied on it will only generate a small leakage current, and the insulation is better. http://www.mktester.com/high-voltage-tester/
