[High Efficiency] Easily identify fiber breakpoints, poor connections, bends, or cracks. Ideal for locating the correct fiber for splicing or quickly identifying faults. Our 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 ideal for field use, featuring constant output power, multi-interface compatibility, low battery warning, extended battery life, and long-distance detection capability. Super bright output powered by convenient AA batteries. [Widely Used] 2.5mm universal connector designed to fit ST, SC, and LC interfaces, compatible with both round and square ferrules on various fiber optic cables. [Long Output Distance] The 30mW visual fault locator delivers a strong red light output, effective up to 20-30 kilometers. High-efficiency power circuit ensures stable performance. [Crash-Proof and Dust-Proof Pen Design] Features 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) Color: Green + Black Material: Aluminum alloy Package Contents: 1 x Fiber Optic Visual Fault Locator Note: Other items not included. Slight color variations may occur due to lighting and display differences. Measurement error allowance: +/- 1-3 cm.