A Leading Supplier of Steam, Measurement and
Control Products for Industrial and HVAC Applications

We help companies operate more efficiently, effectively,
and safely while saving both money and time.


ONICON External Incorporated is a leader in HVAC flow & BTU measurement, with a range of products including turbine meters, vortex meters, electromagnetic meters, thermal mass flow meters, and clamp-on ultrasonic meters as well as BTU meters and display modules. ONICON continually delivers comprehensive solutions for all our customers’ flow and BTU measurement needs. Every product is individually wet-calibrated, and all products are delivered fully programmed for your application and ready to use right out of the box.

Product Summary: HVAC Flow Measurement

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