... features of small and handy structure, portability, and easy operation, and is widely used in the construction and maintenance of optical cable, optical fiber communication, and optical fiber CATV, etc ... -38∼+20dBm1310nm,-40∼+20dBm1550nmRange of wavelength for identification1300,1310,1480,1550,1625,1650nmType of signal for identificationCW, 270Hz±10%, 1kHz±10%, 2kHz ...