Microwave Telecom AV6416 palm OTDR is the newest instrument designed for testing FTTx network. It's mainly used to measure the physical characteristics of optical fiber under test, such as the length, the transmission loss and the splice loss etc.. It can also locate the faults or breaks of optical fiber. It's widely applied in the manufacture, construction and maintenance in optical fiber communication system. AV6416 palm OTDR is novel and beautiful in appearance. AV6416 offers three wavelengths and VLF in one handheld unit, especially for testing passive optical network (PON) in FTTx.