[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. Breaks or faults in the fiber will refract the light, producing a visible glow at the affected area. [Excellent Functions] This fiber optic tester is suitable for field use, offering multiple features including constant output power, multi-interface compatibility, low battery warning, extended battery life, and long-distance detection. Features a super bright output and operates using a standard AA battery. [Widely Used] 2.5mm universal connector designed to be compatible with ST, SC, and LC interfaces, supporting both round and square fiber optic cable types. [Long Output Distance] The 30mW visual fault locator provides a powerful red light output capable of reaching distances up to 20-30 kilometers. The high-efficiency power circuit ensures stable performance. [Crash-proof and Dust-proof Design for Pen Head] Constructed with a stainless steel tip and aluminum body to resist impact and dust. The 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 Note: Light and display differences may cause slight variations between the product color in images and the actual item. Measurement tolerance is +/- 1-3 cm.