Portable gas detectors are an important tool for detecting potentially hazardous concentrations of gases and vapors in occupational and industrial settings. They are designed to detect combustible gases, oxygen depletion, and toxic gases, and can help protect workers in areas where these gases may be present. Portable gas detectors are typically lightweight, handheld devices that are worn on the body or carried with the user. They feature a range of sensors, including catalytic and infrared sensors, which detect combustible gases, and electrochemical and metal oxide semiconductor sensors, which detect toxic gases. The detectors are equipped with an audible and/or visual alarm that alerts the user when a hazardous gas concentration has been detected. Additionally, some portable gas detectors can be connected to a computer or a wireless system, allowing for more accurate measurement and data analysis.