Alarms for the detection of inflammable gases; Carbon dioxide detectors; Carbon monoxide detectors; Combustible gas concentration detectors; Device for testing the function and effectiveness of smoke detectors, carbon monoxide detectors and heat detectors featuring an aerosol spray; Fire and smoke detectors; Gas appliance alarm timer for detecting and alerting the presence of gas flow after a prescribed period of time; Gas detectors for detecting the presence of gas; Infrared thermometers, no...