Oxygen measurement refers to the process of determining the concentration of oxygen in a given environment, such as air or water. This is crucial for various applications, including medical settings, where monitoring a patient's oxygen levels can indicate their respiratory health, and in industrial processes, where oxygen levels can affect production efficiency and safety. There are several methods for measuring oxygen, including electrochemical sensors, optical sensors, and paramagnetic analyzers. Each method has its advantages and is chosen based on the specific requirements of the application, such as accuracy, response time, and environmental conditions.