ONICON's Precise & Cost–Effective Flow Meter Solutions Onicon Incorporated, btu meter, flow meter, coriolis meter, impeller meter, insertion meter ONICON's innovative flow and energy measurement solutions, electromagnetic flow meters for liquids, Turbine Flow Meters the best value for clean closed-loop applications, vortex flow meters the perfect choice for your steam and high temp hot water applications, thermal mass flow meter ideal for your natural gas and compressed air measurement, clamp-on ultrasonic when penetrating the pipe is not an option, BTU meters and display modules accurate energy measurement.