To measure the power of an optical the power of the received signal in dBm and W, 6 possible wavelengths. 
Choice of wavelength: 850nm / 1300nm / 1310nm / 1490nm / 1550nm / 1625nm. Calibration possible by the user. For SC, FC and ST interfaces. Detection range -70~+3,
Wavelengths 800 - 1700 (850, 1300, 1310, 1490, 1550, 1625nm),
Probe InGaAs,
Accuracy 0.01dBm or 0.1% in mW. ID frequency (Hz): 270, 1K, 2K Works thanks to its rechargeable battery (USB charging cord provided). FC / SC interface: you will not need an adapter. Backlit screen. Automatic standby after 10 minutes. Torch function thanks to its integrated LED. To measure the power of an optical signal. Specifications: Indicates the power of the received signal in dBm and W, 6 possible wavelengths.  Choice of wavelength: 850nm / 1300nm / 1310nm / 1490nm / 1550nm / 1625nm. Calibration possible by the user. For SC, FC and ST interfaces. Detection range -70~+3, Wavelengths 800 - 1700 (850, 1300, 1310, 1490, 1550, 1625nm), Probe InGaAs, Accuracy 0.01dBm or 0.1% in mW. ID frequency (Hz): 270, 1K, 2K Works thanks to its rechargeable battery (USB charging cord provided). FC / SC interface: you will not need an adapter. Backlit screen. Automatic standby after 10 minutes. Torch function thanks to its integrated LED.