A Visual Fault Locator (VFL) is a handheld optical testing device used in fiber optic networks to identify faults, breaks, or discontinuities in optical fibers.

It emits a highly visible red laser light (usually around 650 nm) into the fiber, which allows technicians to visually trace the fiber path.

Any break, bend, or poor connection causes the red light to leak out, making the fault location immediately visible to the eye.

VFLs are commonly used for troubleshooting, verifying fiber continuity, and ensuring proper splicing or connector installation.

They are particularly helpful because they provide a fast, simple, and low-cost way to detect fiber issues without the need for more complex equipment like an Optical Time-Domain Reflectometer (OTDR).

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