[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 point of damage. [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 output and powered by standard AA batteries for convenience. [Widely Used] 2.5mm universal connector designed to be compatible with ST, SC, and LC interfaces, suitable for both round and square-shaped fiber optic cables. [Long Output Distance] The 30mW visual fault locator delivers a powerful red light output capable of reaching distances up to 20-30 kilometers. High-efficiency power circuitry ensures stable and reliable performance. [Crash-proof and Dust-proof Pen Design] Features a stainless steel tip and aluminum body for enhanced durability against impact and dust. The grounded case design helps protect against electrostatic discharge (ESD). Battery Requirements: Two 1.5V AA batteries (not included) Color: Green + Black Material: Aluminum Alloy Package Contents: 1 x Fiber Optic Visual Fault Locator Note: The actual product color may vary slightly due to lighting and display differences. Measurement tolerance: +/- 1-3 cm.