[High Efficiency] Easy identification of fiber breakpoints, poor connections, bending, or cracking. Ideal for locating the correct fiber to splice 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, creating a visible glow at the damaged area. [Functions] This fiber optic tester is ideal for field use with multiple 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 ferrules across various fiber optic cables. [Long Output Distance] The 30mW visual fault locator delivers strong output power, emitting a powerful red laser beam 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 prevent ESD damage. Battery: Two 1.5V AA batteries (not included) Type: A Color: Green + Black Material: Aluminum alloy Package Contents: 1 x Fiber Identifier (tester only) Note: Other accessories shown are not included. Note: Lighting and monitor differences may cause slight variations in color appearance. Measurement tolerance: ±1–3 cm.