The document describes seven circular dichroism spectrometer models: 1) The Olis DSM 17 CD UV/Vis[NIR] spectrometer has the widest spectral range of 185-2600 nm and computer-controlled slit width. 2) The Olis DSM 20 CD UV/Vis[NIR] spectrometer is the smallest and most versatile, designed for diverse layouts. 3) The Olis DSM 1000 CD UV/Vis[NIR] rapid-scanning spectrometer is the only model that can rapidly scan, providing potential for novel experiments.