The gas detector is a key instrument for detecting gas concentration and composition. It uses high - precision sensors to quickly and accurately sense gas changes in the surrounding environment. The outer shell material is selected according to different usage scenarios. For example, in industrial sites, sturdy and durable metal materials are used to ensure stable operation in harsh environments. Its advantage lies in its high detection sensitivity, capable of detecting extremely low concentrations of gases; a wide detection range, able to detect a variety of common and special gases; and simple operation, easy to carry and use. It is widely used in fields such as chemicals, mining, and environmental protection to promptly detect safety hazards such as gas leaks and ensure the safety of personnel and production.