[High Efficiency] Easy identification of fiber breakpoints, poor connections, bending, or cracking for locating the correct fiber to splice or quickly finding a break. The 30mW visual fault locator emits a 650nm red light for efficient fiber tracing, fiber routing, and continuity checking. Breaks or faults in the fiber will refract the light, creating a visible glow around the affected area.[Functions] This fiber optic tester is ideal for field testing with multiple features including constant output power, multi-interface compatibility, low battery warning, long battery life, and long-distance detection. Powered by standard AA batteries for convenient use.[Widely Used] 2.5mm universal connector designed to be compatible with ST, SC, FC, and LC interfaces, both round and square shapes, for use with various fiber optic cables.[Long Output Distance] The 30mW visual fault locator delivers strong output power, emitting a bright red light detectable up to 20-30 kilometers. The high-efficiency power supply 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.Batteries: Two 1.5V AA batteries (not included) Type: A Color: Green + Black Material: Aluminum alloy Package Contents: 1 x Fiber Optic Visual Fault Locator Note: Light and display differences may cause slight color variations between the image and the actual item. Measurement allows an error of +/- 1-3 cm.