Hipot Tester, Insulation Resistance Tester, Oil Tester manufacturer / supplier in China, offering 5kv 10kv 15kv 20kv Megohmmeter High Voltage Megohmeter Insulation Resistance Tester, Hzjy-20K 5000V 10000V 15000V 20000V Insulation Resistance IR Pi Dar Tester, 20kv Digtial Insulation Resistance and Polarization Index IR & Pi Tester and so on.