The MSA-130 has the unique capability to operate in both additive and subtractive dispersion mode. Switching between these modes is easily possible without any alignment by turning a selector knob on the instrument. So the same device can operate as low stray light double monochromator in additive mode and also as tunable and adjustable narrow bandwidth filter in subtractive mode, which makes it an ideal instrument for Raman-, Emission- and Fluorescencespectroscopy.