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Fluke Networks

Fluke Networks FIBERLERT-125 Fiber Optic Cable Tester and Detector

  • Based on 163 reviews
Condition: New
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Availability: 12 left in stock
Fulfilled by Amazon
Arrives Tuesday, Apr 14
Order within 3 hours and 46 minutes
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Features

  • Detects optical power in single-mode and multimode fiber wavelengths (near infrared range 850 to 1625 nm)
  • No setup or interpretation needed light and sound indicate presence of optical signal
  • Non-contact detector lessens the risk of damage to fiber optics; suitable for ports and patch cords, SM, MM, UPC and APC connections
  • LightBeat flashes to indicate operation and battery status; powers off after five minutes to preserve battery (2xAAA, included)
  • Two-year warranty

Description

No more guessing if the fiber is live. Quickly check fiber activity, polarity, and connectivity. No setup or interpretation required – just place in front of the fiber end face or port and a light and tone indicate an active fiber. This pocket-sized tool tests single-mode, multimode UPC and APC patch cords and ports using a “non-contact” detector. The FIBERLERT-125, detects for the presence of 850 nm to 1625 nm optical light.

Brand: Fluke Networks


Power Source: Battery Powered


Style: Modern, Compact


Color: Black, white, yellow


Item Weight: 0.22 Ounces


Brand: ‎Fluke Networks


Power Source: ‎Battery Powered


Style: ‎Modern, Compact


Color: ‎Black, white, yellow


Item Weight: ‎0.22 Ounces


Item dimensions L x W x H: ‎6.6 x 0.6 x 1 inches


Specification Met: ‎CE, FCC


Upper Temperature Rating: ‎50 Degrees Celsius


Measurement Type: ‎Optical Power Meter


UPC: ‎195112035665


Manufacturer: ‎Fluke Corporation


Product Dimensions: ‎6.6 x 0.6 x 1 inches


Item Weight: ‎0.22 ounces


Item model number: ‎FIBERLERT-125


Batteries: ‎2 AAA batteries required. (included)


Date First Available: ‎November 15, 2021


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Tuesday, Apr 14

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • PayTomorrow Financing
  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

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Top Amazon Reviews

    • Great tool to have in your IT toolbox!
Great for checking SFP's!
Reviewed in the United States on January 9, 2026 by Richard W.
    • Works perfectly
Fluke Networks never fails to impress, and the FIBERLERT-125 Fiber Optic Cable Tester and Detector is another testament to their quality. This tester is a game-changer for anyone dealing with fiber optic cables. Its accuracy and reliability in detecting cable breaks and faults are remarkable, making troubleshooting a breeze. The user-friendly interface and intuitive design make it easy to use, even for those new to cable testing. The durability and precision of this device make it a must-have for professionals working with fiber optics. Highly recommended for its efficiency and peace of mind it brings to cable maintenance and repair tasks." Please note that this is a generic review and may not accurately reflect the specific features or experiences with the Fluke Networks FIBERLERT-125. If you have any firsthand experience or specific details you'd like to include in the review, feel free to provide them for a more tailored and accurate review ... show more
Reviewed in the United States on December 15, 2023 by Joe Banning
    • Fiberlert
Pretty neat tool, got mine with batteries in them already. Did anyone have to buy new batteries?
Reviewed in the United States on December 23, 2025 by Ider Vivas
    • Product is a must have to verify all fiber pathways
This solved a problem for myself and organization because we forgot our light source. This is the only thing i had in my tool bag to verify the pathway for our fiber connections. Thank you fluke. I have a lot of your products as a Wireless RF Engineer. You all are rock solid company. The smallest, lightest, and the cheapest tool that i have to check a fiber pathway. ... show more
Reviewed in the United States on March 12, 2025 by Jimmy
    • simple quick test to find an active fiber
simple and compact
Reviewed in the United States on January 5, 2025 by Amazon Customer
    • I bought the wrong tool
this was a costly purchase but it does not have a light to trace fiber and that is what I was looking for.
Reviewed in the United States on March 5, 2024 by Reggie
    • Cheap alternative to more expensive tools
Pretty nice tool to have in your tool belt as a network admin. Simply detects light on a fiber strand. No more, no less. You'll need a more feature rich (expensive) tool to really troubleshoot fiber issues, but if you just need to make sure there is light making it through your fiber, this works great. ... show more
Reviewed in the United States on June 26, 2024 by ctpenny
    • Instructions could be better
Instructions could could be better, went to company website to view videos on usage. Needs a lanyard or wrist band not everyone wears a shirt with a pocket in which to put the device. Lightbeat feature is stupid and makes it confusing, when all it does is tell you that it’s about to power off.
Reviewed in the United States on March 26, 2023 by Sophia A.

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