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Visual Fault Locator for 2.5mm and 1.25mm with Continuous or Flash Lumination (20KM)

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  • Product Description

    The Visual Fault Locator launches 650nm visible laser light into the fiber. When the light encounters a break or sharp bend, it scatters, and the scattered light can be observed emerging from the cable. The Visual Fault Locator can locate breaks in short patch cords, which an OTDR cannot detect due to their operating dead zone.

    A fault locator is also much cheaper than an OTDR. However, they are not recommended for using with dark-colored or armored cables.

    The Pen-type Visual Fault Locator can be operated in either continuous wave mode (CW mode) or in pulse mode. Pulse mode aids in locating faults under high ambient light conditions and improves battery life.  It also could be used in checking connector quality.  Often a connector may appear to be perfect.  But inside the connector ferrule itself, poor gluing or dirt may create a micro bend in the fiber. This micro bend will produce excess insertion losses or return losses, and may result in premature failure of the connector. As the visual light launches through the fiber, it emerges from the connector in question, and you can readily see the distortion as a series of rings will superimpose on a normal output. Bending or twisting the fiber may affect the overall intensity pattern, but not the ring pattern itself. 


    • Maintenance in telecom, CATV
    • Test Lab of optical fibers
    • Fiber routing and continuity checking in optical networks
    • Other fiber optic measurements 


    • 2.50mm universal connector for 1.25mm connectors, including SC, and ST.  The FC (male)-LC (Female) adaptor also can be provided on request.
    • Operates either in CW or Pulsed mode with constant output power
    • Low battery warning
    • Long battery life (up to 60 hours)
    • Drop-resistant and dust-proof design of laser head
    • Laser case ground design prevents ESD damage
    • Portable and rugged
    • Easy to use

    Specification Model


    Central wavelength

    650nm±10nm (635nm is available on request)

    Emitter type


    Output power




    Laser Range




    Optical connector

    2.5mm universal connector, for 1.25mm connectors, FC (Male)-LC. (Female) convertor can be provided on request

    Operating model

    Both CW and Pulse available

    Pulse frequency

    2Hz to 3Hz / 9Hz

    Power supply

    2AAA alkaline batteries

    Operating temperature

    -20°C to 60°C

    Storage temperature

    -40°C to 85°C


    13 x 176mm


    50g (without battery)

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