This pen-type optical fiber visual fault locator is designed for fiber optic cable maintenance and helps locate cable defects. The device does not damage the fiber or transmitter face and maintains consistent output unaffected by voltage fluctuations. It provides stable output with a range of up to 50 km, making it a reliable tool for fiber testing. Compact, lightweight, and portable, it enables easy inspection of fiber faults. The red light pen accurately detects breaks, poor connections, bends, and cracks in fiber cables. Suitable for use in integrated wiring systems, fiber optic engineering, CATV network maintenance, optical communication, optical measurement applications, and optical device research and production. Color: black. Material: composite material. Package includes: 1 x pen-type optical fiber visual fault locator. Other items not included. Note: Light reflection and display differences may cause slight color variation between the image and the actual item. Measurement error allowance is +/- 1-3 cm.