AFL VFI4 Compact Long-Range Visual Fault Identifier (2.5mm/1.25mm Adapters Included)

Reference#: 68236
Item#: AF-VFI4-01-0900PR


A Visible Fault Identifier (VFI), also referred to as a Visual Fault Locator (VFL), is an essential tool for fiber installation and maintenance technicians. The AFL VFI4 (VFI4-01-0900PR) is compact and injects high-powered red-laser light to provide exceptional brightness and range for locating defects in single-mode and multimode fibers. The light generated by these units will escape from sharp bends and breaks in jacketed or bare fibers, as well as poorly mated connectors enabling technicians to quickly spot faults. The universal connector interface mates with many connector styles without needing an adapter.

Rugged and Compact: 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.

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.

* Note: AF-VFI4-01-0900PR replaces discontinued item # HILITE-VF13-00-0900PR



• Eye-safe Class 3R visible red laser source, 650 nm
• Output power of 5.0 mW with 10 km range
• Universal connector interface for quick connection
• 2.5 mm universal adapter (included) accepts FC, SC, ST, etc. connectors


• Identify and trace fibers during activation and installation
• Identify poorly mated connectors
• Verify AFL’s FASTConnect® field-installable connector installation
• Find faults inside OTDR dead zones



Emitter Type: Laser, Class IIIa FDA 21 CFR 1040.10 and 1040.11, Class 3R IEC 60825-1:2014
Wavelength: 650 nm ±15 nm
Output Power: 5 mW maximum
Modulation: 2 Hz or CW selected


Adapter: 2.5 mm Universal and 1.25 mm Universal (both included)
Power: 1 AA battery, <30 hours (Flash mode)
Operating Temperature: -10°C to 50°C, 85 % humidity non condensing
Storage Temperature: -30°C to 60°C, 95 % humidity non condensing
Size: (H x W x D) 7.9 x 5.1 x 2.2 cm (3.1 x 2.0 x 0.9 in)
Weight: 43 g (1.5 oz)