Waters 2475 Multi-Wavelength Fluorescence Detector ( MWD ) This Waters 2475 Multi-Wavelength Fluorescence Detector is in excellent condition.  The 2475 Multi-Wavelength (Multi Wavelength FLD) Fluorescence Detector is a multi-channel, tunable, fluorescence detector designed for HPLC applications. The detector delivers the highest sensitivity and selectivity, whether you are monitoring low concentrations of target compounds or low-level impurities. Use the detector as a stand-alone unit or as an integral part of a Waters chromatography system. It operates from 200 to 900 nm and uses newly designed optics, with an enhanced illumination system, for improved performance. These design features increase the optical throughput and sensitivity resulting in an overall increase in the signal-to-noise ratio.