| Manufacturer | UNI-T |
| Type of tester | LAN wiring |
| Display | LED |
| Power supply | battery 6F22 9V x1 |
| Symbol | Detection |
|---|---|
| UT681C | reversed connection, discontinuities and short circuits in conductors |
| UT681L | discontinuities and short circuits in conductors |
| UT681HDMI | reversed connection, discontinuities and short circuits in conductors |