A Dissolved Oxygen Sensor is a device used to measure the amount of oxygen that is dissolved in water. This measurement is crucial for assessing water quality, especially in aquatic environments where fish and other organisms rely on oxygen for survival. The sensor typically works by using electrochemical or optical methods to detect oxygen levels. These sensors are commonly used in various applications, including aquaculture, wastewater treatment, and environmental monitoring. By providing real-time data on dissolved oxygen levels, they help ensure healthy ecosystems and efficient industrial processes, making them essential tools for scientists and engineers alike.