[High Efficiency] Easy identification of fiber breakpoints, poor connections, bending, or cracking. Ideal for locating the correct fiber to splice or quickly identifying faults. The 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, creating a visible glow at the damaged area.[Functions] This fiber optic tester is ideal for field use with multiple features including constant output power, multi-interface compatibility, low battery warning, extended battery life, and long-distance detection. Super bright design powered by convenient AA batteries.[Widely Used] 2.5mm universal connector compatible with ST, SC, FC, and LC interfaces, suitable for both round and square-shaped fiber optic cables.[Long Output Distance] The 30mW visual fault locator delivers strong output power, emitting a highly visible red light effective up to 20-30 kilometers. High-efficiency power circuit ensures stable performance.[Crash-proof and Dust-proof Design] Features a stainless steel tip and aluminum body for durability against impacts and dust. Grounded case design helps prevent ESD damage.Batteries: Two 1.5V AA batteries (not included) Type: A Color: Green + Black Material: Aluminum alloy Package Contents: 1 x Fiber Identifier (Other accessories not included)Note: Lighting and monitor differences may cause slight color variations between the image and the actual item. Measurement tolerance: +/- 1-3 cm.