This pen-type optical fiber visual fault locator is specially designed for maintenance of fiber optic cables and , and can effectively locate defects on the cable. The instrument not damage the fiber and face of the mitter, and the output power is not affected by voltage fluctuations. The output power of the fiber optic pen is stable, and the output distance is 50km, which is a good tool for fiber testing. Small size, light weight, easy to carry, and visual fault locator for easy inspection of fiber faults. This fiber optic red light pen can easily and accurately detect and locate fiber breaks, poor connections, bends or cracks. Integrated wiring system and optical fiber engineering; CATV engineering optical network maintenance; optical communication; optical measurement drive engineering; production and research of optical devices. Colour:black Material:composite material Package Contents: 1 x pen-type optical fiber visual fault locator Only the above package content, other products are not included. Note: Light reflection 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.