insulating oil tester with variable test voltage from 0 to 60, 75, 80, 90 or 100 kV Test as ... self-contained,compact and portable giving smoothvariable test voltage from 0 to 60, 75, 80, 90 or 100 kV for testing ... tension analyzer insulating oil tester with variable test voltage from 0 to 60, 75, 80, 90 or 100 kV