Carbon monoxide detectors; Safety sensors, namely, carbon monoxide detectors, smoke detectors, and combination carbon monoxide and smoke detectors; Device for testing the function and effectiveness of smoke detectors, carbon monoxide detectors and heat detectors featuring an aerosol spray; Apparatus for testing carbon monoxide detectors using an aerosol spray; Carbon dioxide detectors; Electronic carbon dioxide monitors, other than for medical purposes; Carbon dioxide feeders for treating wat...