[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. Faults in the fiber will refract the light, producing a visible glow at the fault location. [Excellent Functions] This fiber optic tester is suitable for field use with features including constant output power, multi-interface compatibility, low battery warning, extended battery life, and long-distance detection capability. Features a super bright output and operates using standard AA batteries. [Widely Used] 2.5mm universal connector designed to be compatible with ST, SC, FC, and LC interfaces, supporting both round and square ferrule shapes across various fiber optic cables. [Long Output Distance] The 30mW visual fault locator delivers a powerful red laser output capable of reaching distances up to 20-30 kilometers. High-efficiency power circuitry ensures stable performance. [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. 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 effects and display settings may cause slight variations between the product color shown in images and the actual item. Measurement may vary by 1-3 cm.