UNI-T UT681C Professional Network Cable Tester – Ethernet LAN RJ45, Telephone RJ11 & Coaxial BNC Continuity Tester

Overview 

The UNI-T UT681C is a versatile, professional-grade network cable tester engineered for IT technicians, networking installers, and security camera technicians. Designed to quickly verify cable integrity, the UT681C tests Ethernet LAN cables (RJ45), telephone lines (RJ11), and coaxial BNC cables for open circuits, short circuits, cross-talk, and miswiring. Featuring both fast and slow scanning modes, a detachable remote terminator for testing long-run wall cables, and rugged drop-proof housing, it is an essential diagnostic tool for cabling installations on Hall Road and beyond.

Key Features 

• Multi-Format Cable Testing: Universal support for RJ45 (CAT5/CAT6 UTP/STP Ethernet), RJ11 (telephone), and BNC (coaxial video/CCTV) cables.

• Comprehensive Fault Detection: Instantly identifies open circuits, short circuits, crossed wires, and reverse connections with clear LED pin-status indicators (1–8 plus G).

• Dual Scan Speeds: Choose between fast and slow test modes to easily troubleshoot complex or intermittent wiring issues.

• Detachable Remote Terminator: Allows single-person testing of long cable runs routed across walls, ceilings, or conduits.

• Shielded Cable Verification: Supports testing of shielded (STP) Ethernet cables with dedicated ground continuity checks.

• Low Battery Indication: Built-in power monitoring alerts you when batteries need replacement to prevent false test results.

Technical Specifications 

Common Applications

• Verifying crimped RJ45 Ethernet patch cords and structured wall cabling runs before network deployment

• Troubleshooting office LAN drops, router connections, and switch links

• Testing CCTV security camera coaxial BNC cables and analog video transmission lines

• Checking telephone line continuity and multi-core intercom wiring