An evolution of the Professional Series water quality meters, the ProSolo DIGITAL handheld replaces the ProODO as YSI’s most advanced optical dissolved oxygen field meter. Paired with the ProDIGITAL ODO/CT (Optical Dissolved Oxygen, Conductivity, and Temperature) probe, the ProSolo is perfect for measuring DO in aquaculture, coastal, estuary, wetland, or any application requiring accurate, real-time salinity-compensated DO measurements. The ProSolo handheld is the direct replacement for the ProODO Optical Dissolved Oxygen handheld that was discontinued on Dec. 31, 2018.