A Dissolved Oxygen (DO) Analyzer is an analytical instrument designed to measure the concentration of dissolved oxygen in a liquid, typically water. It uses various sensing technologies, such as optical or electrochemical methods, to determine the amount of oxygen molecules dissolved in the liquid. DO analyzers find extensive use in environmental monitoring, water quality assessments, wastewater treatment processes, and aquatic research, as the level of dissolved oxygen is a critical parameter in assessing the health of aquatic ecosystems, the efficiency of biological treatment processes, and the potential for corrosion in industrial processes.