Bombay Instrument Mfg. Co. Supplies Paddle Wheel type Digital Flow Meters. Bombay Instrument Mfg. Co. Manufactures Flow Switch, Rotameter Tubes, Chlorinators, Orifice Plates and Assemblies, Valves & Pipe Fittings, Thermometers, Pressure Gauges & Thermocouple, Velocity meter, Stack and duct velocity meter, Air velocity meter, HVAC duct pressure meter, Digital Flowmeter, Digital Water Flowmeter, Battery operated water flowmeter, Water Flow switch, Oil flow switch, SS flow switch, Paddle flow switch, etc. The Paddle Wheel type Digital Flow Meters falls in the category of insertion type flow meters. The rotating paddle wheel generates a signal in proportion to the velocity of the moving fluid which is read in terms of the flow rate. Because the pipe`s cross-sectional area is known & remains fixed the velocity is an indication of the rate.