Using a Visual Fault Locator (VFL or Red Light) for troubleshooting fiber is a fast and easy way to find broken or cracked fibers and splices as well as macrobends and severe microbends anywhere you can see the individual fiber.
VFL is not effective when trying to find a issue within the cable since A: the cable is typically buried and B: the light would not be able to penetrate the PVC outer jacket.

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