UNI-T UT681L Cable Tester
The UT681L is a compact handheld cable tester designed to simplify verification of common network and telephone cabling. Built as a two-piece kit (transmitter and remote receiver), it provides a clear, at-a-glance readout using a set of LEDs and supports multiple test modes so technicians can quickly identify wiring faults. It’s intended for field use: lightweight, battery-powered, and focused on fast, repeatable checks rather than in-depth lab diagnostics.
Operation centers on straightforward single-key controls and visual LED sequencing that indicate opens, shorts, and pair order problems. The unit includes auto- and manual-shutdown behavior to conserve battery, and low-battery detection so results aren’t misread under a weak supply. Its user flow emphasizes speed and clarity: connect, run the chosen scan, and interpret the LEDs a workflow tailored to installers, maintenance staff, and on-site troubleshooting.
Mechanically the tester is small and durable enough for a technician’s pouch; the transmitter and receiver sizes and weights make it truly portable. While not intended as a full cable-certification instrument, the UT681L covers the practical needs of verifying RJ45 and RJ11 wiring integrity, giving quick confidence that cabling is correctly wired before deployment or repair.
Features:
- Fast, slow and scan test modes for flexible checks.
- Full-display test mode with LED sequencing (LED1–LED8 + LED_G).
- Detects short circuits, open circuits, and crossover wiring.
- Single-key operation for quick one-hand use.
- Auto and manual shutdown to save battery life.
- Low-battery detection (threshold indicated in the datasheet).
- Supports testing shielded and unshielded Ethernet pairs (RJ45) and RJ11.
Specifications:
| Specification | Value |
|---|---|
| Test targets / connectors: | RJ45, RJ11 |
| Test modes: | Fast, Slow, Scan, Full display |
| Indicators: | LED1–LED8, LED_G |
| Detects: | Short circuit, crossover, open circuit |
| Power supply: | 9V battery |
| Low battery threshold: | Less than 7.2V |
| Working temperature: | 0°C ~ 40°C |
| Storage temperature: | -10°C ~ 50°C |
| Working humidity: | 20% ~ 80% RH |
| Storage humidity: | 10% ~ 90% RH |
| Altitude: | ≤ 2000 meters |
| Safety / EMC: | EN61326-1:2013 EN61326-2-2:2013 CE, UKCA |
| Transmitter size: | 102 × 62 × 28 mm |
| Receiver size: | 102 × 37 × 28 mm |
| Transmitter net weight: | 87 g |
| Receiver net weight: | 51 g |
| Standard accessories (listed): | 9V battery BNC-to-RJ45 adaptor (UT681C only) English manual |
| Standard individual packing: | Gift box |
| Standard qty per carton: | 40 pcs |
| Standard carton measurement: | 455 × 410 × 225 mm |
| Standard carton gross weight (UT681L): | 6.4 kg |
Applications:
- Network Cable Installation and Termination Verification.
- Ethernet Cable Fault Detection and Diagnosis.
- Live Network PoE (Power over Ethernet) Detection.
- Cable Length Measurement and Estimation.
- Network Port (Ping) Testing and Link Status Identification.
- Telephone Line (POTS) Testing.
- BNC/Security Camera Coaxial Cable Testing.
- USB Cable Connectivity Testing.
- Cable Mapping and Wire-pair Identification.
- Remote Terminal for Distributed Cable Tracing.
Package Contents:
- 1x UT681L Cable Tester (Transmitter unit).
- 1x Remote Receiver unit.
- 1x 9V Battery (standard accessory).
- 1x English User Manual (standard accessory).
- 1x Gift box (individual packaging).