Twisted pair cable tester EFB Elektronik 39919.1V2 RJ-11 RJ-12 RJ-45

The EFB Elektronik 39919.1V2 is a compact twisted-pair cable tester for RJ-11, RJ-12 and RJ-45 connectors. It is part of a network tool set that also includes a crimping tool for RJ11/RJ12/RJ45, an LSA insertion tool, and a cable cutter/stripper. The tester helps verify proper wiring and connectivity of telephone and Ethernet cables; battery (9V block) is not included.

Advantages

The tester offers a small, lightweight design for easy handling on-site and supports common connector types (RJ-11, RJ-12, RJ-45). It enables quick verification of cable continuity and pin assignment in twisted pair lines and complements the included crimping and insertion tools for efficient installation and troubleshooting.

Suitable for

• Testing telephone lines with RJ-11/RJ-12 connectors
• Verifying Ethernet cables with RJ-45 connectors (Cat5/Cat5e/Cat6 wiring)
• Field installation and maintenance of small LANs
• Troubleshooting connectivity and wiring faults

Key specifications

• Model: EFB Elektronik 39919.1V2
• Supported connectors: RJ-11, RJ-12, RJ-45
• Color: black, red and white
• Included in set: LAN tester (this model), crimping tool RJ11/RJ12/RJ45, LSA insertion tool, cable cutter/stripper
• Power: 9V battery (block) — not included
• Category: Cable tester
• Brand: EFB Elektronik
• MPN: 39919.1V2
• EAN: 4049759293772

How to use

Connect the appropriate connector (RJ-11, RJ-12 or RJ-45) from the tester to the cable under test and, if applicable, attach the remote unit to the far end of the cable. Insert a 9V battery into the tester according to the polarity markings. Power on the unit and observe the indicator LEDs or sequence to determine continuity, short circuits or miswiring. Follow standard safety procedures and ensure cables are de-energized before testing.

Recommendations

Use the tester together with the supplied crimping and LSA insertion tools for end-to-end verification after terminations. Store the unit in a dry environment and replace the 9V battery when indicator output becomes weak. For reliable Ethernet testing, ensure connectors and cable pairs are properly terminated before performing the test.