https://www.grandwaytelecom.com/products/instrument/optical-laser-source-power-meter/1141.html Functions FCA 18 CWDM Power Meter is specially designed for CWDM system, covering wavelength from 1270nm~1610nm. It measures and monitors optical power and attenuation value of 18 channels from 1270nm to 1610nm. All calibrated wavelengths will be tested simultaneously and all test results will show on the LCD screen.All Rights Reserved