TONGDY

Air analysis apparatus; Air quality measurement apparatus, namely, particle counters; Apparatus for analysing gases; Carbon dioxide detectors; Carbon monoxide detectors; Dust measuring apparatus; Electronic-based instruments for measuring environmental parameters including humidity, mold, bacteria, air quality and water quality; Gas detectors for detecting the presence of gas; Gas flow monitors; Gas sensors for measuring gas concentration; Gas testing instruments; Pollutant sensors; Scientific instruments, namely, electronic analyzers for measuring, testing and detecting contaminants and environmental pollutants; Surveying instruments; Temperature transmitters; Thermostats