GDYJ-502A 80KV Transformer Oil Breakdown Voltage Tester ready for shipment GDYJ-502A Transformer Oil Breakdown Voltage Tester is used to measure breakdown voltage of transformer oil/insulating oil. It has two kinds of output voltage 80KV and 100KV for you choice. The test standards are IEC60156, IS6792, BS5874, ASTM D1816 , ASTM D877.LCD color touch screen. with RS232 int