... structure. Easy operation.Adapters available for bare fibers and tail fibers.Major FunctionsIdentify multiple signal frequencies, i.e. 270Hz ... , 1kHz and 2kHz.Display the intensity of optical signal. Low power indication.Show the direction of optical ... ∼+20dBm1310nm,-40∼+20dBm1550nmRange of wavelength for identification1300,1310,1480,1550,1625,1650nmType of signal for identificationCW, 270Hz±10%, 1kHz± ...