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Gas detection monitors and tools check for the presence of gases in construction, confined space, and plant maintenance applications to find leaks and prevent exposure to hazardous gases. Portable gas detection devices notify users when the presence of a single gas or multiple selected gases have been detected. Fixed gas detection devices continuously monitor a specific area and tie into automated facility alarm or alert systems. Gas detection tubes and sample pumps draw air across test granules which change color when exposed to a selected gas.