| 324 / | HD | ELECTRICITY: MEASURING AND TESTING |
| 500 | DF | FAULT DETECTING IN ELECTRIC CIRCUITS AND OF ELECTRIC COMPONENTS {10} |
| 537 | DF | .~ Of individual circuit component or element {17} |
| 754 | DF | .~.~ With probe elements {8} |
| 755 | ![]() | .~.~.~ Internal of or on support for device under test (DUT) |