Laboratory equipment and supplies, namely, thermometers; Radon detectors; Alarms for the detection of inflammable gases; Carbon monoxide detectors; Carbon dioxide detectors; Gas appliance alarm timer for detecting and alerting the presence of gas flow after a prescribed period of time; Temperature meters not for medical use; Safety sensors, namely, carbon monoxide detectors, smoke detectors, and combination carbon monoxide and smoke detectors; Gas detectors for detecting the presence of gas; ...