High efficiency: Easy identification of fiber breakpoints, poor connections, bending, or cracking for finding the right fiber to splice or quickly locating a break. The 30mW fault locator emits a 650nm red light for fiber tracing, fiber routing, and continuity checking. Breaks or faults in the fiber will refract the light, creating a visible glow around the faulty area.Functions: The fiber optic tester is ideal for field testing with multiple features including constant output, multi-interface adaptation, low battery warning, long battery life, and long-distance detection. Powered by convenient AA batteries.Widely Used: 2.5mm universal connector designed to be compatible with ST, SC, FC, and LC interfaces, suitable for both circular and shaped fiber optic cables.Long Output Distance: The 30mW fault locator provides a strong light source output, emitting a powerful red indicating light effective up to 20-30 kilometers. The high-efficiency power circuit ensures stable performance.Crash-proof and Dust-proof Design: Features a stainless steel tip and aluminum body to resist impact and dust. The grounded case design helps prevent ESD damage.Battery Requirement: Two 1.5V AA batteries (not included) Color: Green + Black Material: Aluminum alloy Package Contents: 1 x Fiber Fault Locator Note: Light and display differences may cause slight variations in color compared to the actual item. Measurement may vary by +/- 1-3 cm.