The Fiber Optic Mini OTDR Reflectometer 1310/1550nm 22/24dB for 60km 9 in 1 Fiber Optic Cable Ethernet Tester is a state-of-the-art and versatile device designed for efficient testing and analysis of fiber optic cables. In standard Singlemode cable assembly, the two wavelengths used for Insertion Loss testing are 1310nm and 1550nm. Quick Setup mode for fast configuration of wavelength, distance range, pulse width and measurement duration; Parameters Set mode lets professionals fine-tune wavelength, IOR, non-reflection threshold, end threshold and more for. Fiber optic transmission wavelengths are determined by two factors: longer wavelengths in the infrared for lower loss in the glass fiber and at wavelengths which are between the absorption bands.