Light Pen

Light Pen

TLMA VFL is specially designed for field personnel who need an efficient and economical tool for fiber tracing, fiber routing and continuity checking in optical network. This fiber optic light pen, also called vfl pen, includes:

  • Visual fault locator can find the breakpoint, poor connections, bending or cracking in fiber optic cable.

  • This visual fault locator fiber optic testing tools can find the faults of OTDR dead zone

  • The ideal visual fault finder have end-to-end visual fiber identification

Light Pen


2.5mm universal connector, for 1.25mm connectors,FC (Male)-LC (Female)

convertor produced by TUOLIMA can be provided on requests.
Operates either in CW or Pulsed
Constant output power
Lower Battery warning
Long battery life (up to 60 hours)
Crash-proof and dust-proof design for laser head

Advantages of Light Pen

Laser case ground design prevents ESD damage

  • Burning testing to ensure reliability.

  • Portable and rugged, easy to use

Specification of Light Pen



Central Wavelength

650nm±10nm (635nm can be required on request)

Emitter Type


Output Power

Optional choice for 1mw, 10mw on actual needs

Optical Connector

2.5mm universal connector

For 1.25mm connectors, FC (Male)-LC (Female) convertor

can be optional on customer requests

Operating Model

Both CW and Pulse available

Pulse Frequency


Power Supply

2  AA alkaline batteries

Battery Operating Time

650nm@1mw ≥65hour


Test with Panasonic LR6 AA ALKALINE battery

Operating Temperature

-10~+45 (℃)

Storage Temperature

-40~+70 (℃)

Dimension (mm)



900g(Without battery)

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