Mini Pro Series Optical Time Domain Reflectometeradopts 3.5 inch color display screen. The Ul operation inter-face is simple and easy to operate. It integrates OTDR,Stable Light Source, Optical Power Meter, Visual Fault Loca-tion, Cable Sequence, Cable Length, Cable Tracker andFlashlight. It adopts intelligent power saving management,12 hours of super long measurement time to ensure thefield test and maintenance work efficiently.The instrument is used to measure the length, loss,connection quality and other parameters of all kinds ofoptical fiber and cable. When there is optical signal in theline, it can still be used. The maximum test power with lightis -5dBm. It can be widely used in engineering construction,link maintenance test and emergency repair of communi-cation system of optical fiber communication system.