[High Efficiency] Easy identification of fiber breaks, poor connections, bending or cracks. to find the right fiber to splice or quickly locate a . 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. [Features] Fiber optic tester is perfect for field tests due to multiple functions such as constant output power, multi-interface adaptation, low battery warning, long battery life and long-distance detection. Super bright and uses convenient AA battery. [Widely Used] 2.5mm Universal Connector - the detector's connector is compatibly designed for ST, , , LC interferons both in circle and square shape of different fiber optic cables. [Long Output Distance] 30mW visual fault locator has a strong output power, can output a strong red indication light, up to 20-30 kilometers. The high-efficiency power supply circuit ensures a stable power supply. [Crush and Dust-proof Design for Pen Head] It is designed with stainless steel head and aluminum body to prevent crush and dust, and the case 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 shooting 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.