This Aqua TROLL sensor monitors Fluorescent Dissolved Organic Matter (FDOM), which is a fraction of Chromophoric Dissolved Organic Matter (CDOM) that fluoresces when excited with near UV light.

Features of this sensor include Integrated Optical Compensation to compensate for LED drift over temperature and time, along with Isolated Optical Frequencies and Low-Interference Spectral Bands to minimize interference and improve accuracy.