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Visual Fault Locator for Fiber

Trouble finding faults? Crank up the power with this adjustable light source.


Please call 877-877-2269 for a replacement product or part.
Extended Double Diamond™ Warranty Available (3 Additional Year)

Product Features

  • Isolates light leaks or breaks in single- or multimode fiber optic cable.
  • Test longer distances with three output levels: 0 dBm, +3 dBm, and a powerful +8 dBm.
  • Features a 650-nm wavelength and a switch-selectable CW/2-Hz modulated frequency.


  • Identify fiber breaks, tight bends, bad connectors, and poor splices.
  • Verify continuity.
  • Works with jacketed and bare fiber.
  • Finds faults in the dead zone of an OTDR.
  • Use to test patch cables, distribution panels, splice trays, and more.
  • Includes a FC/PC connector. SC/PC, and STR/PC interchangeable connectors are available.
  • Auto-off function prolongs rechargeable 3.6-V lithium ion battery life.

  • Having trouble with data getting garbled over your fiber optic network? Not sure if the problem is the equipment or the cable? Start troubleshooting with the Visual Fault Locator for Fiber. This powerful light source features three adjustable output settings: 0 dBm, +3 dBm, and +8 dBm. Testing short runs? Use the 0 setting. Need to go a few miles down the road? Crank it up to 8 dBm.

    Use the Visual Fault Locator for Fiber to determine if the problem is a leak, a break, bad connectors, or poor splices in your fiber optic network. You'll be able to locate sharp bends and breaks in jacketed or bare fiber connections in patch panels and fanouts.

    Tech Specs

    Connectors FC/PC (SC/PC, ST/PC interchangeable connectors also available)
    Dimensions 4.5"H x 2.5"W x 1.2"D (11.5 x 6.5 x 3 cm)
    Frequency (Modulated) 2 Hz
    Laser Class Class 2 for 0 dBm output, Class 3R for +3 dBm outut, Class 3B for +8 dBm output
    Output Power 0 dBm, + 3dBm, +8 dBm (adjustable)
    Power (1) 3.6-V lithium ion battery (included), AC adapter
    Temperature Operating: 14 to 122° F (-10 to +50° C); Storage: -4 to +158° F (-20 to +70° C)
    Wavelength (Output) 650 nm ± 10 nm
    Weight 0.3 lb. (0.1 kg)

    * Technical specification weight is the unit weight. It is not the packaged shipping weight. For shipping weight, please contact Black Box customer service at 877-877-2269.



    Double Diamond Warranty

    Extended 1 Year Warranty Available

    Protect your purchase with an additional 1 Year Double Diamond™ warranty!
    Cost: $40.00

    Extended 3 Year Warranty Available

    Protect your purchase with an additional 3 Year Double Diamond™ warranty!
    Cost: $79.99


    Double Diamond™ Warranty (Standard)

    Take the risk out of equipment purchases with the Double Diamond™ Warranty from Black Box Network Services.

    The Double Diamond Warranty is our warranty that protects your Black Box® brand products* from accidental damage, including drops, water, and power surges.

    The Visual Fault Locator for Fiber comes with a standard 2 YEAR already included.

    During the warranty period, Black Box Network Services will repair or replace your damaged equipment within one week of receipt at NO CHARGE!*

    Plus, get an Extended Double Diamond Warranty.

    You can also extend your warranty or protect a previously purchased Black Box® brand product** for an additional year—for only 10% of the purchase price! Or, extend your coverage for a full three years for only 20% of the purchase price!

    Ordering an extended warranty is easy: When viewing a product in your shopping cart, just select the one or three years of additional coverage in the dropdown menu under “Warranty Options.” For details, contact Customer Service at 724-746-5500.

    * Warranty subject to certain exclusions and limitations ** Certain products may not be eligible.

    What’s more, we also have a 45-day return policy. Simply call Customer Service for a Return Authorization (RA) number, return your product in new condition and in the original package, and receive a full refund.