NK308B/C series color LCD OPM with separated wave lengths are mainly used for the installation, test and mainte nance of FTTH Optical Access Network. When there are multiple wavelengths of optical signals in an optical fiber, the traditional OPM can not identify the wavelength. Different from the traditional OPM, this series can identify the wave length and give the power value of each wavelength in the fiber at the same time. It is mainly used for the power measurement of the down link signal 1490nm, 1577nm and 1550nm in 10GEPON/XG PON and RF network, so that the installation and maintenance personnel can truly grasp the power value of the single wavelength optical signal and accurately judge whether the optical power value meets the standard.