Quantum Hydrometrie GmbH (Germany)
- develops and sells hydrometric measurement solutions.
- http://www.quantum-hydrometrie.de/

Eesiflo Ultrasonic
- Supplier of ultrasonic instrumentation and clamp on flow meters
- http://www.eesiflo.com/

Keison Products
- The Prosonic Flow ultrasonic flow measurement, a clamp-on ultrasonic measurement.
- http://www.keison.co.uk/endress/endress1.htm

EES Ultrasonic Flowmeter Division
- Supply and rent out ultrasonic flowmeters for liquid control and measurement applications.
- http://www.flowmeters.f2s.com/

J-TEC Associates, Inc. (USA)
- founded in 1968, providing quality ultrasonic vortex flowmeters for engine, air, gas, steam, liquid applications.
- http://www.j-tecassociates.com/

Greyline Instruments (USA, Canada)
- Manufacturer of non-contacting Flow Meters, Portable Doppler Flow Meters, Ultrasonic Level Controls, Tank Farm Monitors, Doppler Flow Meters, Flow Switches, Open Channel Flow Monitors
- http://www.greyline.com

American Sigma, Inc. (USA)
- Manufacturer of Open Channel Flow Meters, Water Quality Monitors, Wastewater Samplers and Sewer System Management Software.
- http://www.americansigma.com

Siemens (Germany)
- SITRANS F ultrasonic flowmeter for industrial applications
- http://www.processnews.de/edition97/97_02/en/mass.htm

Badger Meter, Inc. (USA)
- Manufacturer of products using flow measurement and control technology serving industrial and utility markets worldwide.
- http://www.badgermeter.com/

Control Electronics Inc.
- Manufacturers and designers of ultrasonic open-channel flowmeters, doppler flowmeters, level monitors and pump controllers. All meters have built-in data-logging.
- http://www.controlelectronics.com

Signal Processing SA (Switzerland)
- Ultrasonic Doppler velocimeters that measure in real time velocity profiles in liquid (used mainly for research applications - to understand how liquids flows - in university and industry.
- http://www.signal-processing.com/index.htm

Krohne
- Variable area, magnetic-inductive, ultrasonic, mass flowmeters; level measuring instruments; flow controllers. Manufacturer, global supplier.
- http://www.krohne.com

Kamstrup (DK)
- Kamstrup energy metering, ultrasonic flowmeters.
- http://www.kamstrup.dk/

Flotec UK Limited (UK)
- Transit-time clamp-on Ultrasonic flowmeter for fluid flow measurement
- http://www.flotec-uk.com/

Dynasonics (USA)
- Ultrasonic and magnetic flow measurement.
- http://www.dynasonics.com/

Compuflow (USA)
- Ultrasonic Doppler Flowmeter.
- http://www.compuflow.com/contact.html