valves; manual control apparatus for valves; gas testing instruments; water testing instruments; apparatus for collecting and testing gas, liquids, and vapors; technical measuring, testing, collecting and checking apparatus and instruments for collecting, measuring, testing and checking the temperature, pressure, quantity and concentration of gas, liquids, and vapors; scientific instrumentation for sampling gas, liquids, and vapors; valves for controlling and regulating the flow of gases, liquids, or vapors, not being parts of plumbing, heating, cooling installations or machines; sampling units, comprising sampling bottles and manual valves therefor, for use in the industrial sampling of fluids, gases, and vapors; flow switches for monitoring and controlling the flow of gases or liquids; control valves for regulating the flow of gases, liquids, and vapors manual liquid-flow control machines and instruments; manual liquid-level control machines and instruments; laboratory apparatus and instruments for the exchange of substances and heat heat exchanger assemblies for laboratory use; laboratory equipment, namely, plastic, rubber and elastomer closures, seals and stoppers for laboratory bottles; laboratory glassware; laboratory bottles; laboratory cylinders; apparatus for analyzing vapors, gases, and liquids in the nature of vapor, gas and liquid pipeline sampling assemblies consisting of two or more of the following housed components, sample takeoff probes for scientific purposes, automatic valves, manual valves, flow regulators for commercial use, liquid separators, pressure regulators, barometers, liquid level indicators, heat exchangers, temperature gauges, and sample cylinders

consulting services in the field of gas and fluid sampling; engineering and design of gas and fluid measuring products, systems and components; research and development in the field of gas and fluids products, systems and components; engineering in the field of air, gas, water monitoring systems and instrumentation industry; engineering design services