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When you can't dilute the sample or reduce the path length, think of the UV-2550. The double blazed grating, double monochromator (DDM) in this instrument is just waiting for those samples. Shimadzu has achieved the world's lowest level of stray light and highest energy throughput with this unique design. By creating two blaze wavelengths (200nm and 600nm), Shimadzu has overcome the energy loss and sensitivity restrictions usually associated with double monochromator instruments. The face of the grating is actually divided into two unique areas for short and long wavelength measurements. The sodium iodide spectra for the double monochromator UV-2550 and a single monochromator instrument described below put this information into practical terms.