flowmeters; measuring, testing, and analysing sensors, apparatus, instruments and devices, namely, flowmeters and apparatus for measuring concentration, density, velocity, pressure and flow of gases, liquids, solids, and fluids; flow measuring apparatus, namely, flowmeters and apparatus for measuring concentration, density, velocity, pressure and flow of gases, liquids, solids, and fluids; instruments for measuring fluids, gases, liquids and solids, namely, flowmeters and apparatus for measur...