• Low power model, VFI4-L, with an output power of 1.0mW with 4km range
• 2.5 mm universal adapter included, accepts FC, SC, ST, etc. connectors
• Class 2 laser source, wavelength: 650 nm, ±15 nm
• Provides exceptional brightness and range for locating sharp bends, breaks, faulty connectors, and other faults
• Locate defects in single-mode and multi-mode fibers 

The AFL VFI4-02-0900PR is a VFI4-L low power (1mW) visual fault identifier with a 2.5mm universal adapter included. A Visible Fault Identifier (VFI), also referred to as a Visual Fault Locator (VFL), is an essential tool for fiber installation and maintenance technicians. AFL’s compact VFI4 injects high-powered red-laser light to provide exceptional brightness and range for locating sharp bends, breaks, faulty connectors, and other faults.

Rugged and Compact

The rugged VFI4-L is designed for the rigors of real-life field testing. It has a range of up to 4 km, fits on a keychain, and features extensions that protect the red-laser port. It has both CW and pulsating modes and is powered by a single AA battery for up to 50 hours of operation.

Installation and Activation

VFI4 is used for quick continuity checks, fiber tracing, splice verification, and Pass/Fail validation for mechanical connectors. VFI4 is also an excellent complement to any OTDR because it can locate faults inside the OTDR’s dead zone.

Essential Troubleshooting Tool

The VFI4 highlights sharp bends, breaks, faulty connectors, and other defects that “leak” light. Other applications include end-to-end continuity checks, as well as identifying connectors in patch panels and fibers during splicing operations.