High Efficiency: Easily identify fiber breaks, poor connections, bends, or cracks to find the right fiber to splice or quickly locate a break. The 30mW Visual Fault Locator emits a 650nm red light for fiber tracing, fiber routing, and continuity checking effectively. Breaks or faults in the fiber will break the light, creating a glow around the faulty area. Features: The fiber optic tester is perfect for field testing due to multiple functions such as constant output power, multi-interface adaptation, low battery warning, long battery life, and long-distance detection. Super and uses a convenient AA battery. Wide Range of Applications: 2.5mm Universal Connector - the detector's connector is compatibly designed for ST, SC, FC, LC connectors, both in square and round shapes, for various fiber optic cables. Long Output Distance: The 30mW visual fault locator has a strong output power, capable of emitting a strong red indication light, up to 20-30 kilometers. The high-efficiency power supply circuit ensures stable power supply. Crush and Dust-Proof Design for Pen Head: It is designed with a stainless steel head and aluminum body to prevent crushing and dust, and the cap's ground design effectively prevents ESD damage. Batteries: Two 1.5V batteries (not included) Types: A Color: Green + Black Material: Aluminum Alloy Package Contents: 1 set x Fiber Identifier Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture to be slightly different from the real thing. The allowed measurement error is +/- 1-3cm.