Profile: CSE Corp. produces self-contained self-rescuers. We also produce portable and machine-mounted gas monitoring instruments for detecting, measuring and monitoring toxic or combustible gases and oxygen. We specialize in air-quality monitoring systems. The SR-100 is our self-contained self rescue breathing apparatus. It provides 60 minutes of breathable air. It is a chemical-based re-breather, which recycles the user's exhaled breath, chemically removes the carbon dioxide from the air, and replenishes it with oxygen. It recycles exhaled breath, chemically scrubbing carbon dioxide while replenishing the oxygen based on the user's demand or work rate.