The VFI4 Visual Fault Identifier from AFL is an essential tool for efficiently locating faults in fiber optic networks. With an output power of 5.0 mW, it provides a remarkable range of up to 10 kilometers, making it suitable for a variety of applications. This device comes equipped with adaptable connectors, including a 2.5 mm universal adapter for FC, SC, and ST connectors, and a 1.25 mm universal adapter in the high power version for LC and MU connections. Engineered for safety and user convenience, the VFI4 utilizes an eye-safe Class 3R visible red laser source with a wavelength of 650 nm, ensuring compliance with stringent safety standards, including IEC 60825-1. Furthermore, the unit operates effectively within a wide temperature range and offers low power options for shorter distances. Its lightweight design and straightforward connection interface make it a practical choice for professionals engaged in fiber optic splicing, testing, and locating.