Alcoholmeters; Air quality measurement apparatus, namely, particle counters; Alarms for the detection of inflammable gases; Apparatus for analysing gases; Carbon dioxide detectors; Carbon monoxide detectors; Device for testing the function and effectiveness of smoke detectors, carbon monoxide detectors and heat detectors featuring an aerosol spray; Electronic-based instruments for measuring environmental parameters including humidity, mold, bacteria, air quality and water quality; Gas alarms;...