A METTLER TOLEDO dissolved oxygen analyzer continuously measures the dissolved oxygen level in water or a liquid process stream or vessel in real-time. Depending on the kind of application and industry, the dissolved oxygen concentration is expressed either in relative numbers, such as percent saturation, volume percent, percent of dissolved oxygen, ppm or in absolute numbers, e.g. mg/L or mmol/L. METTLER TOLEDO offers DO analyzers with cutting-edge optical technology that combine precise measurement down to trace levels with low maintenance.