Flow sensors and flow meters are not a single brand but a category of devices used to measure the flow rate of liquids or gases. These devices are produced by various companies worldwide, including Siemens (Germany), Emerson (USA), Endress+Hauser (Switzerland), and Yokogawa (Japan). They serve industries such as water treatment, oil and gas, chemical processing, and HVAC. Common products include electromagnetic, ultrasonic, and turbine flow meters, as well as thermal mass flow sensors. Brands like Honeywell (USA) and ABB (Switzerland) also offer advanced flow measurement solutions for industrial automation and process control.