James R.Austin TX
Verified purchase
Seriously bright beam and the build feels solid. The case and dust cap are a nice touch, and the charge has held up great so far.
KLFO50
$49.90
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50 mW650 nm visible redUp to 40 kmSC / FC / ST
Out of stock
CX-761O-H6UN
KLFO50 - Visual Fault Locator 50mW
The Karvinger KLFO50 is a high-power 50mW Visual Fault Locator designed to quickly identify breaks, bends, and connection issues across fiber networks up to 40km. Built with a shock-resistant aluminum shell and a long-life rechargeable battery (7 hours runtime), it offers continuous and flashing modes for precise troubleshooting. Compatible with SC, FC, ST, and includes an LC adapter.
$49.90
Volume pricing
| Quantity | Unit price | Saving |
|---|---|---|
| 1 – 4 | $49.90 | — |
| 5 – 9 | $47.41 | −5% |
| 10 – 24 | $44.91 | −10% |
| 25 – 99 | $40.92 | −18% |
| 100 – 499 | $36.93 | −26% |
| 500+ | $32.44 | −35% |
Indicative. Breaks apply per line item; mixed SKUs aggregate on request.
Specifications
| Laser output | 50 mW |
|---|---|
| Wavelength | 650 nm, visible red |
| Detection range | 40 km |
| Output modes | Continuous · flashing |
| Interfaces | SC / FC / ST |
| LC support | Included FC–LC adapter |
| Fiber types | Singlemode & multimode |
| Dimensions | 5.71 × 1.18 × 1.18 in |
|---|---|
| Housing | Aerospace-grade aluminum |
| Battery | Rechargeable lithium |
| Runtime | 7 h |
| Charging | USB-C |
| Certifications | CE · FCC · RoHS |
| Case | Carbon-fiber EVA, semi-rigid |
Capabilities
- Break and bend location to 40 km
- Continuous output mode
- Flashing output mode
- End-to-end continuity check
- Connector and splice fault checks
- Shock-resistant field housing
- Singlemode and multimode fibers
In the box
- KLFO50 locator
- Carbon-fiber EVA case
- FC–LC adapter
- USB-C charging cable
- Lanyard
- User manual
- Warranty card
Video
Shipping & warranty
| Dispatch | 3–4 business days |
|---|---|
| Built to order | 4–6 weeks above stock on hand |
| Origin | US warehouse |
| Shipping | Free on every order |
| Term | 24 months |
|---|---|
| Cover | Repair or replace |
| Money-back | 30 days |
| Restocking fee | None |
Field reports
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Customer video reviews
- MarcusNetwork Tech
- DanielFTTH Installer
- RyanField Engineer
- ChrisData Center Tech
- SteveNetwork Installer
- MarkFTTH Installer
Mike D.Columbus OH
Verified purchase
Great little tool. The light is very bright and it does exactly what I need.
David O.Portland OR
Verified purchase
Been running it on the job for a few weeks. The rechargeable battery is a game changer and the beam is so bright I can spot it outdoors, even shining out of fiber lying on the ground from a distance.
Scott L.Phoenix AZ
Verified purchase
Works great, no complaints at all.
Kevin T.San Diego CA
Verified purchase
This is my third one now. Lost one, gave one away, and grabbed another as soon as it was back in stock. The quality keeps me coming back.
Liam P.Boston MA
Verified purchase
Strong output for the price. Easy to trace a fault, even through a splitter.
Henry K.Nashville TN
Verified purchase
Finding a break in a fiber run would be nearly impossible without one of these. Accurate, dependable, and being rechargeable means I can take it anywhere with no cable tying me down.
Carlos M.Miami FL
Verified purchase
Comes with the adapters you need and the beam is plenty strong to pin down faults.
Erik N.Minneapolis MN
Verified purchase
Tested it against a set of dummy circuits and it found the fault every single time. Worth the money.
Paul S.Seattle WA
Verified purchase
Solid aluminum body, no heat issues, charges over USB-C, and the case is great. The output is a nice even pattern that lights the fiber uniformly.
Tom B.Denver CO
Verified purchase
Finally replaced my old AAA powered VFL with this rechargeable one, and it even came with a case. Perfect for identifying fiber ports on long runs. Recommend.
Nathan F.Atlanta GA
Verified purchase
We use pricey units at work for long runs, but for quick short runs this does the job perfectly without tying up the expensive gear.
Brian H.Dallas TX
Verified purchase
It is not a high end Fluke and does not pretend to be, but it works flawlessly for what it is. Convenient, easy to use, and a great value addition to the tool bag.
Logan M.Chicago IL
Verified purchase
Built like a tank and the battery easily lasts a full day of testing. USB-C charging beats chasing down spare batteries every time.
Greg P.Charlotte NC
Verified purchase
Bright enough to trace through connectors and splitters without guessing. It lives in my bag now and I reach for it on almost every call.
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Questions about this tool
What is a visual fault locator used for?
A visual fault locator sends a bright visible red laser down an optical fiber so that breaks, sharp bends and bad connectors show up where the light leaks out — the fastest way to confirm continuity and physically locate a fault. The KLFO50 is a high-power 50 mW visual fault locator.
How far can a visual fault locator detect a fault?
Range depends on laser power. The KLFO50's 50 mW output supports fault location on spans up to about 40 km (around 25 miles), depending on fiber and connector condition.
Do I need a VFL or an OTDR?
A visual fault locator quickly finds faults you can see — breaks, bends and bad connectors — for a fraction of the cost of an OTDR, which characterizes a whole link with distance-to-fault measurements. Many technicians carry a VFL like the KLFO50 for fast field checks and reserve an OTDR for full certification.
Does a VFL work on both single-mode and multimode fiber?
Yes. The KLFO50's 650 nm visible red laser works on both single-mode and multimode fiber, because it locates faults with visible light rather than a measurement wavelength.
What connectors does the KLFO50 work with?
It connects natively to SC, FC and ST connectors through a 2.5 mm interface, and an LC adapter is included — so it works with virtually any standard fiber optic infrastructure.
How do I charge it and how long does the battery last?
The KLFO50 has a built-in rechargeable battery good for about 7 hours of continuous use, charged over USB-C. There are no disposable batteries to replace.
Is the laser safe to use?
The KLFO50 emits a high-power visible laser, so never look directly into the beam or a connected fiber end, and never point it at anyone's eyes. Check connectors with the light off, and use flashing mode for distance work.
What warranty and shipping come with the KLFO50?
The KLFO50 is covered by Karvinger's 2-year limited warranty against manufacturing defects. It ships free express from Karvinger's U.S. warehouses, typically arriving in about 3–4 business days.
