[High Efficiency] Easily identify fiber breaks, poor connections, bending or cracking. Excellent for finding the right fiber to splice or quickly locating a break. Our 30mW visual fault locator emits a 650nm bright red light for fiber tracing, fiber routing and continuity checking efficiently. Breaks or faults in the fiber will refract the light, creating a bright glow around the faulty area. [Excellent Features] The fiber optic tester is perfect for field testing due to its multiple functions such as constant output power, multi-interface adaptation, low battery warning, long battery life and long-distance detection. Super strong and uses convenient AA battery. [Widely Used] 2.5mm Universal Connector - The detector's connector is universally designed for ST, SC, FC, LC interferes both in circle and square shape of different fiber optic cables. [Long Output Distance] The 30mW visual fault locator has a strong output power, can output a strong red indicator light, up to 20-30 kilometers. The high-efficiency power supply circuit ensures a stable power supply. [Crash-proof and Dust-proof Pen Head Design] It is designed with a stainless steel head and aluminum body to prevent crashes and dust, and the housing ground design prevents ESD damage effectively. Batteries: Two 1.5V batteries (not included) type: 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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.