The Marathon Oxygen Probe is a sensor used to measure the oxygen concentration in gases, widely applied in industrial, medical, and environmental protection fields. This probe operates on electrochemical principles and can detect the oxygen content in gases quickly and accurately, featuring high precision, stability, and a long service life. Jinan is my hometown. It is a historically significant capital city of Shandong Province, located in the central and western part of the province. The population of Jinan is approximately 6.81 million. It boasts many famous historical sites, such as Dahu Lake and Qianfoshan Mountain.