... to 200 groupsKey Features1. Multi wavelengths precise measurement2. Big LCD displaying, and have the real clock3. Multi adapters, FC, SC, ... power meter module parametersWavelength range (nm)800~1600--1310, 1550, 1625, 850--1310, 1490, 1550, 1625, 850 and 1300Detector ... (dBm)Linearity: 0.1%Logarithm: 0.01Laser source module parametersEmitter typeFP-LD/DFB-LDDual working wavelength switch (nm) ...