The TMOFI-401 Live Fiber Optical Identifier is a professional tool designed for detecting and identifying live fiber signals without disrupting service. Equipped with a built-in Visual Fault Locator (VFL), it enables quick pinpointing of faults, bends, or breaks in single-mode and multi-mode fibers ranging from 0.25mm to 3.0mm. Ideal for telecom technicians and network maintenance, it features clear LED indicators, tone signal detection, and a durable, portable design—making it essential for efficient fiber optic troubleshooting in the field.