[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 650nm bright red light for efficient fiber tracing, routing, and continuity checking. Breaks or faults in the fiber will refract the light, producing a visible glow at the fault point. [Excellent Functions] This fiber optic tester is ideal 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 for convenience. [Widely Used] Equipped with a 2.5mm universal connector designed to fit ST, SC, and LC interfaces, compatible with both round and square-shaped 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 km. High-efficiency power circuitry ensures stable performance. [Crash-proof and Dust-proof Pen Design] Constructed with a stainless steel tip and aluminum body for enhanced durability against impacts and dust. Grounded case design helps protect against electrostatic discharge (ESD) damage. Batteries: Two 1.5V AA batteries (not included) Type: A Color: Green + Black Material: Aluminum alloy Package Contents: 1 x Fiber Identifier (tester only) Note: Lighting and display differences may cause slight color variations between the image and the actual product. Measurement tolerance allowed is +/- 1-3 cm.