9 Air quality measurement apparatus, namely, particle counters; Sensors for measuring concentrations of chemicals in water; Sensors for measuring organic and inorganic components of solids, liquids, and airborne particulates, not for medical use; Automatic fluid-composition control machines and instruments; Electronic-based instruments for measuring environmental parameters including humidity, mold, bacteria, air quality and water quality; Gas sensors for measuring gas concentration; Gas testing instruments; Industrial calibration sensors; Measuring and control devices for air conditioning technology; Pollutant sensors; Safety sensors, namely, carbon monoxide detectors, smoke detectors, and combination carbon monoxide and smoke detectors; Scientific instrumentation for measuring concentrations of chemicals in water; Scientific instrumentation for measuring concentrations of metals and metal analytes in solution metals, not for medical use; Scientific instruments, namely, electronic analyzers for measuring, testing and detecting contaminants and environmental pollutants; Scientific instruments, namely, electronic analyzers for testing and analyzing chemical and biological substances for the presence, absence, or quantity of metals in fluids and tissues; Scientific instruments, namely, electronic analyzers for testing consumer products for the presence of contaminants; Scientific apparatus and instruments for measuring relative DNA, RNA and protein and parts and fittings therefor; Technical measuring, testing and checking apparatus and instruments for measuring, testing and checking the temperature, pressure, quantity and concentration of gas and liquids; Touchscreen sensors; Water testing instrumentation for monitoring and detecting contamination