The UNI-T UT681L tester is a simple but effective tool for quickly diagnosing network and telephone cables. With its help, you can easily check the continuity of cables, identify short circuits, crossed pairs and circuit breaks. Due to its compact form, convenient one-button operation and clear LED system, the UT681L is perfect for the daily work of network technicians, installers or service technicians.
The UT681L supports the inspection of cables terminated with RJ45 and RJ11 connectors, enabling quick inspection of connections on Ethernet networks and telephone lines. LEDs (LED1~LED8 and LED_G) indicate the status of each cable, allowing faults such as breaks, short circuits or crossovers to be detected. Two modes are available - fast and slow - so you can adapt the test to the specific application.
The device is powered by a standard 9V battery, which ensures mobility and quick start-up without charging. An auto-off feature extends battery life after 10 minutes of inactivity, and a low battery indicator reminds you to replace the battery. Thanks to its compact size and light weight, the UT681L fits easily in any service bag.
The robust, red-gray housing ensures durability during operation in various conditions. The tester is designed to operate in a temperature range of 0 to 40°C and up to 80% humidity, making it ideal for both office and field use. The product is CE and UKCA certified, which confirms its safety and compliance with European standards.

- Manufacturer code UT681L
- Supported connectors RJ45, RJ11
- Test functions Detection of short circuits, interruptions, crossings and faulty connections
- Test modes fast, slow
- Result display LEDs (LED1~LED8, LED_G)
- Examination of Ethernet cable shielding Yes
- Power supply 9V battery
- Automatic shutdown function after 10 minutes of inactivity
- Low charge indicator below 7.2V
- One-button operation Yes
- Operating temperature 0~40°C
- Storage temperature -10~50°C
- Operating humidity 20~80% RH
- Storage humidity 10~90% RH
- Maximum operating altitude ≤2000 m
- Safety standards CE EN61326-1:2013, EN61326-2-2:2013
- Net weight transmitter 87 g, receiver 51 g
- Dimensions Transmitter 102 × 62 × 28 mm; receiver 102 × 37 × 28 mm
- Color red-gray