AFL VFI4 Visual Fault Identifier

The VFI4 is about the size of an automotive key-fob and packs a powerful Class 3R red laser with a 10 km range. It is powered by one universally available AA battery which will last for more than 30 hours in flashing mode. The VFI4 features a 2.5 mm universal adapter that accepts PC and angled FC, SC, ST, etc. connectors. There is an option for 1.25 mm universal adapter for LC and MU connectors.


  • Emitter Type: Laser, Class IIIa FDA 21 CFR 1040.10 and 1040.11, IEC, 60825-1:2014
  • Wavelength: 650 nm ±15 nm
  • Output Power: 5 mW Maximum
  • Modulation: 2 Hz or CW selected
  • Power 1 AA battery, <30 hours (flash mode)
  • Size (H x W x D) 7.9 x 4.7 x 2.2 cm (3.1 x 1.8 x 0.8 in)
  • Weight 43 g (1.5 oz)
More Information
Manufacturer AFL
Manufacturer's Part Number VFI4-01-0900PR
Ships in 8-10 Weeks
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AFL’s compact VFI4 injects high-powered red-laser light to provide exceptional brightness and range for locating defects in single-mode and multimode fibers. During installation and activation, the VFI4 is used for quick continuity checks, fiber tracing, splice verification, and Pass/Fail validation for mechanical connectors. The VFI4 is also an essential troubleshooting tool to find sharp bends, breaks, faulty connectors, and other defects that “leak” light enabling technicians to quickly spot them. The rugged VFI4 is designed for the rigors of real-life field testing. It has a range of up to 10 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 30 hours of operation.

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pdf VFI4 Flyer pdf 530.2 KB Download
pdf VFI4 Specifications pdf 250.3 KB Download
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