EFB Elektronik 39990.1 Light Injector

The EFB Elektronik 39990.1 light injector is a compact visual locator for daily use in fiber optic applications. It is designed for network testing and is compatible with FC, SC and ST connectors. With a width of 167 mm, a depth of 12 mm and a weight of 60 g, the unit is suitable for field, industrial and laboratory environments and for checking single‑mode and multi‑mode optical fibers, locating faulty fiber optic components and identifying and patching fibers.

Advantages

Compact and lightweight construction simplifies carrying and handheld operation. Compatibility with FC, SC and ST connectors allows testing across common connector types. Battery operation using AAA alkaline batteries provides convenient, portable power without need for mains supply. The device’s design supports routine checks, troubleshooting and fiber identification tasks.

Suitable for

• Testing and tracing single‑mode optical fibers
• Testing and tracing multimode optical fibers
• Identifying and patching individual fibers in cabling
• Locating faulty fiber optic components during maintenance
• Field, industrial and laboratory network diagnostics

Key specifications

• Brand: EFB Elektronik
• Model / MPN: 39990.1
• EAN: 4049759064044
• Connector compatibility: FC, SC, ST
• Dimensions (approx.): width 167 mm, depth 12 mm
• Weight: 60 g
• Power: AAA alkaline batteries

How to use

Insert AAA alkaline batteries according to the polarity markings, connect the appropriate connector (FC, SC or ST) to the fiber or adapter under test and switch on the light injector. Observe the light output at the far end of the fiber or use it to trace individual fibers within a bundle. Turn the device off after use to conserve battery life and remove batteries if the unit will be stored for extended periods.

Recommendations

Use the EFB Elektronik 39990.1 in a darkened or low‑light environment to improve visibility of the injected light. Handle connectors and fiber ends carefully to avoid contamination or damage; inspect and clean connectors before use according to standard fiber‑handling procedures.