A Dissolved Oxygen (DO) Meter is a reliable water quality testing instrument designed to measure the amount of oxygen dissolved in water with accuracy and consistency. It is widely used for monitoring water quality in wastewater treatment plants, STP and ETP systems, aquaculture, laboratories, industrial processes, and environmental applications. The meter provides quick and convenient readings, helping operators maintain proper oxygen levels and monitor treatment performance. Its portable design, easy-to-read display, and efficient probe system make it suitable for both routine testing and on-site water analysis.