The Crowcon Clip is a portable gas detection monitor that provides reliable and durable fixed-life monitoring in a compact, lightweight package. It is designed for use in hazardous areas and has a 2-year operational life. The Crowcon Clip can detect hydrogen sulfide, carbon monoxide, or oxygen and features user-friendly operation, changeable alarm levels, and event logging capabilities. It is designed to withstand harsh industrial conditions between -40°C to 50°C.