Network cable tester EFB Elektronik 39938.1

The EFB Elektronik 39938.1 network cable tester is a compact device for testing twisted pair network cables. It provides clear LED feedback for line continuity and wiring faults, enabling fast identification of open circuits, shorts and miswires. Designed for use with common ethernet cable types, this tester is lightweight and portable for field diagnostics and routine verification of cable installations.

Advantages

The tester offers an easy-to-read LED display that simplifies interpretation of test results and reduces troubleshooting time. Its compact form factor and low weight make it convenient to carry between work sites or store in a technician's toolkit. The unit supports multiple twisted pair cable configurations and provides reliable basic diagnostics for continuity and wiring order without complex setup.

Suitable for

• Installation verification of Ethernet twisted pair cables (Cat5e/Cat6)
• On-site troubleshooting of network connectivity issues
• Routine maintenance checks in small and medium-sized networks
• Home network cable testing and DIY cabling projects

Key specifications

• Supported cable type: twisted pair network cables (UTP/STP)
• Display: LED indicator array for individual pair status
• Functions: continuity check, pair identification, detection of open/short/miswire conditions
• Power: battery-powered for portable operation
• Weight and size: compact and lightweight handheld design

How to use

Connect one end of the network cable to the main unit and the other end to the remote terminator, or insert both ends into the appropriate ports if the tester is single-ended. Power the unit using the specified batteries and select the appropriate test mode if multiple modes are available. Observe the LED indicators to determine continuity and correct pair wiring; a sequential LED pattern typically indicates correct pair order while missing or simultaneous lights indicate faults. After testing, remove the cable and power off the device to preserve battery life.

Recommendations

Use the tester on de‑energized cables only; avoid testing live telephone or power lines. Store the unit in a dry environment and replace batteries when LED brightness declines. For full certification or performance guarantees (for example length measurement or advanced diagnostics), use specialised certification tools as required by project specifications.