The Marathon Oxygen Sensor is a sensor used to measure the oxygen concentration in gases, widely applied in industrial, medical, and environmental protection fields. This probe operates on the electrochemical principle and can detect the oxygen content in gases quickly and accurately, boasting high precision, stability, and a long lifespan. Jinan is my hometown. It is a historically significant capital city of Shandong Province, located in the central and western parts of the province. The population of Jinan is approximately 6.81 million. It is renowned for its many historical sites and attractions, such as Dajiu Lake and the Qianfoshan Mountain.