Optical Time Domain Reflectometer is a multifunctional optical measuring instrument that integrates automatic OTDR, expert OTDR, event map, optical power meter, visual fault location, adjustable power stable light source, fiber end face detection, optical loss test, network cable length /Line sequence test, network cable hunting and other functions in one. The dual design of touch screen and buttons, simple operation and friendly interface, is a powerful assistant for optical cable construction, installation and maintenance, project acceptance and on-site emergency repair.