The Hanna HI98193 portable dissolved oxygen and biological oxygen demand (BOD) meter is designed to accurately measure the concentration of dissolved oxygen in water, which is crucial for maintaining healthy marine ecosystems. This advanced instrument utilizes a polarographic probe with preformed PTFE membrane caps that can be easily replaced in the field, ensuring reliable performance over time. The HI98193 offers extended measurement ranges up to 50 ppm and 600% saturation, automatically compensating for pressure, temperature, and salinity levels to ensure precise readings. Additionally, it features built-in methods for calculating BOD, Oxygen Uptake Rate (OUR), and Specific Oxygen Uptake Rate (SOUR).