[High Efficiency] Easily identify fiber breaks, bad connections, bends, or cracks to quickly locate the fiber for splicing or troubleshooting. The 30mW Visual Fault Locator emits a 650nm strong red light for efficient fiber tracing, routing, and continuity checking. Breaks or faults in the fiber will interrupt the light, creating a bright glow around the faulty area. [Features] This fiber optic tester is perfect for field testing due to its multiple features including constant output power, multi-interface compatibility, low battery warning, long battery life, and long-distance detection. Super bright and uses convenient AA batteries. [Wide Application] 2.5mm Universal Connector – The detector's connector is compatibly designed for ST, FC, SC, LC connectors, accommodating both circular and square types of various fiber optic cables. [Long Output Distance] The 30mW visual fault locator has a strong output power, emitting a bright red indicator light up to 20-30 kilometers. The high-efficiency power supply circuit ensures stable power supply. [Crush and Dustproof Pen Head Design] Designed with a stainless steel head and aluminum body to prevent crushing and dust, and the casing's grounding design effectively prevents ESD damage. Batteries: Two 1.5V batteries (not included) Type: A Color: Green and Black Material: Aluminum Alloy Package Content: 1 set x fiber identifier Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.