... automatic control system. Enable to set wavelength automatically,error free to adjust 0%T,100%T,T/A, and A,T,C direct ... . Using the latest PC technology and electric control system; optimize traditional light path and structure design;detector ... ~50mm5~100mmOptical SystemSingle beam of light,autocollimating optical system,1200line/mm diffraction gratingWavelength Accuracy±2nmWavelength Repetition Ratio ...