Gas detectors are devices designed to identify the presence of specific gases in the air. They are commonly used in various settings, such as industrial workplaces, homes, and laboratories, to ensure safety by detecting harmful or flammable gases. These detectors can alert users through alarms or visual signals when gas levels exceed safe limits. There are different types of gas detectors, including electrochemical, infrared, and catalytic sensors, each suited for detecting particular gases like carbon monoxide, methane, or hydrogen sulfide. Regular maintenance and calibration of gas detectors are essential to ensure their accuracy and reliability in protecting people from potential hazards.