Bombay Instrument Mfg. Co. Supplies Level Transmitters. Bombay Instrument Mfg. Co. Manufactures Flow Switch, Rotameters 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. In the Level Transmitters the level of the tank/vessel can be transmitted in terms of 4-20mA.