Easy identification of fiber breakpoints, poor connections, bending, or cracking. For finding the right fiber to splice or quickly locating a fault. 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, creating a bright glow around the faulty area. The fiber optic tester is perfect for field tests with functions including constant output power, multi-interface adaptation, low battery warning, long battery life, and long-distance detection. It uses a convenient AA battery. Features a 2.5mm universal connector compatible with ST, SC, FC, and LC interfaces for both circle and square shape fiber optic cables. The 30mW visual fault locator has a strong output power for a red indicating light visible up to 20-30 kilometers. The high-efficiency power supply circuit ensures stable power. It is designed with a stainless steel head and aluminum body to prevent crash and dust, and the case ground design prevents ESD damage efficiently. Batteries: Two 1.5V batteries (not included). Type: A. Color: Green and black. Material: Aluminum alloy. Package Contents: 1 set x fiber identifier. Only the above package content, other products are not included.