Alarms for the detection of inflammable gases; Electric, electronic, or electrochemical oxygen monitors and sensors for environmental use; Electrical controllers; Gas alarms; Gas testing instruments; Meteorological instruments; Pressure controllers for controlling the pressure of liquid, semi-liquid, and gaseous substances in industrial processes; Radon detectors; Safety sensors, namely, carbon monoxide detectors, smoke detectors, and combination carbon monoxide and smoke detectors; Smoke ala...