Mini pro OTDR fiber optic tester for sale, dual wavelength 1310/1550nm, dynamic range 22/20dB, with six functions of optical time domain reflectometer/optical power meter/ visual fault location/stable light source/RJ45 line sequence measurement/flashlight, 500 ~60km. Mini pro OTDR fiber optic tester for sale, dual wavelength 1310/1550nm, dynamic range 22/20dB, with six functions of optical time domain reflectometer/optical power meter/ visual fault location/stable light source/RJ45 line sequence measurement/flashlight, 500 ~60km. In standard Singlemode cable assembly, the two wavelengths used for Insertion Loss testing are 1310nm and 1550nm. All Singlemode fibers work very similarly in either wavelength—that is, you don't need to buy fiber based on wavelength, one fiber fits all. So, IF your cable assembly is built. 【ALL-IN-ONE TOOL】: Used for evaluating the construction and maintenance of FTTx and access networks, identifying optical fiber breakpoints, measuring fiber cable length, and calculating relative optical power loss. The single output allows the user to test at both 1310nm and 1550nm without disconnecting and reconnecting the cable. When used with an Advanced Fiber.