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1mW 5mW 10mW 20mW 30mW Fiber Optic Visual Fault Loctor VFL Fiber Checker Optical Cable Break Point Detector Red Laser Tester

SKU: 1906040047

 Sales Rep  Tech Support

Model# Output Power
FF-VFL-A10 10mW
FF-VFL-A20 20mW
FF-VFL-A30 30mW
FF-VFL-ALC LC Adapter Sold Separately


This Visual Fault Loctor (VFL) is specially designed for field workers who need an efficient and economical tool for fiber tracing, fiber routing and continuity checking in optical networks. The VFL can find break points, poor connection point, bending or cracking in fiber optic cables; and it can find faults located in an OTDR dead zone and also can be used for end-to-end visual fiber identification.  

The VFL launches 650nm visible light into a fiber. When the light encounters a break or sharp bend, it scatters, and the scattered light can be observed emerging from the cable. More importantly, The VFL can locate break points in short patchcords, which an OTDR cannot detect due to their  operating dead zone.
The Visual Fault Locator can be operated in either continuous wave mode (CW mode) or in pulsed mode. Pulsed mode aids in locating faults under high ambient light conditions and improve battery life. It also could be used in  checking connector quality. 
NOTE: Customers need to buy battery by themself, because battery is refused by most mail agent to carry. This VFL uses normal AAA battery, so customers can easily get them from their local market. 

Visual Fault Loctor









Emitter type


Output Power






Detecting Range






Optical Connector

2.5mm Universal Connector, 1.25mm Adapter Optional

Modulation Frequency


Battery Life (CW)

13 Hours

8 Hours

6 Hours

5 Hours

3 Hourse

Battery Life (9Hz)

19 Hours

17 Hours

10 Hours

7 Hours

5 Hours

Battery Life (3Hz)

23 Hours

20 Hours

12 Hours

10 Hours

6 Hours

Power Supply

2 AAA Battery

Working Temperature 

-35℃~+70; <90%RH

Storage Temperature

-40℃~+90; <90%RH


Ø13 x 181mm


106g (without battery)

 Visual Fault Locator

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Warranty Service:
FirstFiber warrants to the purchaser that our products shall be free from defects in material and workmanship under normal use (consumables, normal tear and wear excluded) for a period of one year from the date of shipment. Any part which is determined by FirstFiber to be defective in material or workmanship shall be returned to FirstFiber or authorized service location, as FirstFiber designates and shipping costs prepaid. Defective items will be repaired or replaced at FirstFiber's option.



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Working in partnership with the policy lead at BERR (The Department for Business, Enterprise & Regulatory Reform), NWML is the UK Enforcement Authority for the Restriction of the Use of Certain Hazardous Substances in Electrical and Electronic Equipment Regulations 2008 (the “RoHS Regulations”). Manufacturers need to understand the requirements of the RoHS Directive to ensure that their products, and their components, comply.



The Federal Communications Commission (FCC) is an independent United States government agency. The FCC was established by the Communications Act of 1934 and is charged with regulating interstate and international communications by radio, television, wire, satellite and cable. The FCC's jurisdiction covers the 50 states, the District of Columbia, and U.S. possessions.