The Portable Multi-Gas Detector (4-Gas Monitor) is a professional handheld safety instrument designed to detect and continuously monitor hazardous gases in confined spaces and industrial environments. It simultaneously measures oxygen (O2), combustible gases (LEL), carbon monoxide (CO), and hydrogen sulfide (H2S), providing real-time readings on a clear digital display. Built with advanced sensor technology, the detector delivers fast, accurate, and reliable measurements to help prevent accidents caused by toxic gases or oxygen deficiency. It features audible, visual, and vibrating alarms that activate when gas concentrations exceed preset safety limits, ensuring immediate warning to the user. Its compact, lightweight, and rugged construction makes it suitable for oil and gas facilities, chemical plants.