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Optical system=double-beam-grating-1200-lines-mm; Wavelength Range=190-nm-to-1100-nm; Spectral Bandwidth=2-nm; Wavelength Accuracy=plusmn-0-1-nm-656-1-nm-plusmn-0-3-nm-all; Wavelength Repeatability=le-0-1-nm;Shop Online at Labtron.cc!