This category encompasses measurement and monitoring instruments for physical properties of fluids such as liquids, gases, and vapors in manufacturing processes, including flow rate, flow velocity, pressure, temperature, density, and viscosity. It includes essential equipment groups for accurately monitoring fluid conditions in piping systems and manufacturing equipment, supporting process control, quality management, and safety management. This covers flow meters, pressure gauges, thermometers, density meters, viscometers, flow velocity meters, and other instruments that support fluid management and process optimization in manufacturing sites. It accommodates a wide range of specifications from simple display functions to high-precision digital output and communication-enabled devices.