[High Efficiency] Easy identification of fiber breakpoints, poor connections, bending, or cracking. Ideal for locating the correct fiber for splicing or quickly identifying faults. The 30mW visual fault locator emits a 650nm bright 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 affected area. [Functions] This fiber optic tester is suitable for field testing with features including constant output power, multi-interface compatibility, low battery warning, extended battery life, and long-distance detection. Features a super bright output and operates using standard AA batteries for convenience. [Widely Used] 2.5mm universal connector designed to be compatible with ST, SC, FC, and LC interfaces, supporting both round and square ferrule shapes for 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. High-efficiency power circuitry ensures stable operation. [Crash-Proof and Dust-Proof Pen Design] Constructed with a stainless steel tip and aluminum body for durability against impacts and dust. Grounded case design helps protect against electrostatic discharge (ESD) damage. Batteries: Two 1.5V AA batteries (not included) Type: A Color: Green + Black Material: Aluminum alloy Package Contents: 1 x Fiber Identifier (assembled set) Note: Lighting and display settings may cause slight color variations between the image and the actual item. Measurement tolerances may vary by +/- 1-3 cm.