[High Efficiency] Easy identification of fiber breakpoints, poor connections, bending, or cracking. 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. Faults in the fiber will refract the light, producing a visible glow at the fault location. [Excellent Functions] This fiber optic tester is ideal for field use, featuring constant output power, multi-interface compatibility, low battery warning, extended battery life, and long-distance detection capability. Equipped with a super-bright light source and powered by standard AA batteries for convenience. [Widely Used] Features a 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 a strong red laser output capable of reaching distances up to 20–30 kilometers. The high-efficiency power circuit ensures stable and reliable performance. [Crash-Proof and Dust-Proof Pen Design] Constructed with a stainless steel tip and aluminum body for durability against impact and dust. The grounded case design helps protect against electrostatic discharge (ESD) damage. Batteries: Two 1.5V AA batteries (not included) Type: A/B Color: Purple and black / Green and black Material: Aluminum alloy Package Contents: 1 x Fiber identifier Note: Lighting and display differences may cause slight color variations between the image and the actual item. Measurement allows an error of 1–3 cm.