| 4614 |
| Vanguard | ATRT-01 S3 | Transformer Turns Ratio Tester | Automatic, single-phase transformer turn ratio tester(line power only) |
| 6518 |
| Vanguard | ATRT-01B S3 | Transformer Turns Ratio Tester | Automatic, single-phase transformer turn ratio tester(rechargable-battery powered) |
| 6519 |
| Vanguard | ATRT-03 S2 | Transformer Turns Ratio Tester | Automatic, 3-phase transformer turns ratio tester up to 100Vac |