We are offering optical loss tester.The aou400 is one of the most optimized olts on the market, combining a source port, a power meter and vfl in one unit to help technicians to measure the optical loss in the fiber network. It offers up to three singlemode or two multimode sources with a wavelength-identification digital encrypted protocol, so that another aou400 optical loss test set can automatically use the proper calibration parameters . This reduces the need for communication between the twotechnicians and decreases the potential for error, an optional vfl to enable technicians toquickly do the troubleshooting on possible fiber breaks and fix the faults in the field. Opm, ols, vfl in one device;measure the optical attenuation of the fiber;data storagebuilt-in vfl for fast troubleshootingauto wavelength detection(optional)data transfer (optional)7x24 real-time monitor on pc; (optional)energy save mode;reference value storage;power autonomy of 100 hours (opm);one-year warranty and three-year recommended calibration interval