UNI-T UT682 Wire Pair Finder and Network Cable Tester with RJ45/RJ11 Support

When a network link fails or a cable disappears into a wall, the UNI-T UT682 gives technicians a fast, reliable way to identify, trace, and verify wiring. This handheld unit combines an analog tone generator and a responsive receiver, making it ideal for IT professionals, electricians, and home users who need to troubleshoot RJ45, RJ11, or bare-wire connections without guesswork.

Key specifications

• Functionality: wire tracking, cable mapping, and polarity test
• Supported cable types: RJ45, RJ11, and general wires via alligator clips
• Wire tracking method: analog tone generator
• Tracing distance (telephone line): up to 3000 m
• Tracing distance (network cable): up to 100 m for cable mapping
• Cable mapping test types: open, short, cross, reverse, and split pair
• Output signal level (transmitter): 8 Vp-p
• Output signal frequency: 6.5 kHz
• Power supply: 1 x 9 V (6F22) battery for transmitter and 1 x 9 V (6F22) battery for receiver
• Low battery indication: yes
• Headphone jack: yes (on receiver)
• Flashlight: yes (on receiver)
• Auto power off: yes (transmitter and receiver)
• Operating temperature: 0 °C to 40 °C
• Storage temperature: -10 °C to 50 °C
• Operating humidity: 20 % to 75 % RH
• Storage humidity: 10 % to 90 % RH
• Safety: CE, RoHS

Why choose it

The UT682 stands out for its dual functionality: it not only tests and maps network cables but also serves as an analog tone generator for tracing wires. Its ability to handle RJ45, RJ11, and bare wires makes it a versatile addition to any toolkit. The receiver includes a built-in flashlight and headphone jack for use in dark or noisy environments, and auto power off helps conserve battery life.

Ideal use cases

• Identifying and tracing cables in walls, ceilings, or patch panels
• Verifying correct wiring of RJ45 and RJ11 terminations
• Locating opens, shorts, crosses, reversals, and split pairs
• Polarity testing on telephone lines
• On-site troubleshooting by network technicians and electricians

Good to know

The UT682 is powered by two standard 9 V batteries (one for the transmitter, one for the receiver), which are easy to replace. The analog tone generator provides a clear, audible signal that can be traced over long distances, especially on telephone lines. With its compact design and included alligator clips, this tester is ready for both bench and field use.