[High Efficiency] Easily identify fiber breakpoints, poor connections, bends, or cracks. Ideal for locating the correct fiber for splicing or quickly identifying faults. This 30mW visual fault locator emits a bright 650nm red light for efficient fiber tracing, routing, and continuity checking. Breaks or faults in the fiber will refract the light, producing a visible glow at the damaged area. [Excellent Functions] This fiber optic tester is ideal for field use, offering multiple features including constant output power, multi-interface compatibility, low battery warning, extended battery life, and long-distance detection capability. Features super-bright output and operates using a standard AA battery for convenience. [Widely Used] Equipped with a 2.5mm universal connector designed to fit ST, SC, FC, and LC interfaces, compatible with both round and square ferrules on various fiber optic cables. [Long Output Distance] The 30mW visual fault locator delivers strong output power, emitting a highly visible red light effective up to 20-30 kilometers. The high-efficiency power circuit ensures stable performance during extended use. [Crash-proof and Dust-proof Design for Pen Head] Constructed with a stainless steel tip and aluminum body for enhanced durability against impact and dust. The grounded case design provides effective protection against electrostatic discharge (ESD). Batteries: Two 1.5V AA batteries (not included) Type: A Color: Green + Black Material: Aluminum alloy Package Contents: 1 x Fiber Visual Fault Locator Note: Lighting and display differences may cause slight variations in color between the image and the actual item. Measurement tolerance: +/- 1-3 cm.