9 Hygrometers; Thermo-hygrometers; Air analysis apparatus; Electric sensors; Electronic-based instruments for measuring environmental parameters including humidity, mold, bacteria, air quality and water quality; Fire and smoke detectors; Gas detectors for detecting the presence of gas; Gas meters; Gas sensors for measuring gas concentration; Safety sensors, namely, carbon monoxide detectors, smoke detectors, and combination carbon monoxide and smoke detectors; Scientific instrumentation for measuring temperature, humidity, relative humidity, pressure, weight, and for measuring chemical levels in water; Scientific instruments, namely, electronic analyzers for measuring, testing and detecting contaminants and environmental pollutants; Technical measuring, testing and checking apparatus and instruments for measuring, testing and checking the temperature, pressure, quantity and concentration of gas and liquids; Thermometers not for medical purposes; Time recording apparatus