Hand-held Optical Time Domain Reflectometer of RANGER FTTH 2020 Series is a newly hand-held and intelligent communication measuring device in accordance with the test of Optical fiber and Communication System. The product is used to measure the parameters like optical fibers, length of the optical fiber, loss, following quality and the like. It can quickly and accurately position the case point and fault point of the optical fiber link. It can be widely used in the engineering construction, route maintenance and urgent repair of the Optical fiber and Communication System. It can also be used in optical fiber and optical cable development as well as production measurement. The product can effectively do help to the installation and construction of the optical fiber network, the following speedy and effective maintenance and the troubleshooting test.