optical time domain reflectometer is a new generation of portable and intelligent measuring instrument designed for testing optical fiber communication system. Adopt 5.8 inch color touch screen, button/ touch dual operation; Internal integration of eight major functional modules, multi-functional integration to help customers effectively solve the field test and maintenance; The highest 45 dB dynamic range, can penetrate optical splitter, effective PON network testing; Intelligent power-saving management, 20 hours long standby, efficient protection of test dimension Continuous