Gracey & Associates
- Hire of sound and vibration instruments, with traceable calibration, United Kingdom.
- http://www.gracey.com/

Castle Group Ltd
- Manufacturer and supplier of sound level meters and vibration meters. Sales, rental, training, calibration and consultancy services available.
- http://www.castlegroup.co.uk

HEAD Acoustics
- Test systems in the areas of sound quality evaluation, noise and vibration troubleshooting, binaural recording and playback, and telecommunication systems testing.
- http://www.headacoustics.com/

Unholtz-Dickie Corp.
- Manufacture complete vibration test systems including shock and vibration controllers, electrodynamic shakers, head expanders, power amplifiers , transducer calibration systems and instrumentation.
- http://www.udco.com/

Trig-Tek Inc.
- Design and manufacture of instrumentation to monitor, record, simulate, and control vibration signals .
- http://www.trig-tek.com/

Larson Davis Acoustic Measurement Products
- Product line includes condenser microphones and accessories, sound level meters, portable and realtime frequency analyzers, noise dosimeters, environmental noise monitoring systems.
- http://www.larsondavis.com

Lansmont Corporation
- Provides field data recorders, test equipment and testing services to prepare products and packages for their specific transportation environment.
- http://www.lansmont.com/

Cirrus Research plc
- Manufacture acoustic measurement instrumentation, such as sound level meters, environmental noise monitoring equipment and airport noise monitoring systems.
- http://www.cirrusresearch.co.uk/

Endevco (UK)
- Supplier of dynamic instrumentation for vibration, shock, inertial motion and dynamic pressure measurements, including a comprehensive line of accelerometers, pressure transducers, microphones, electronic instruments, and calibration systems.
- http://www.endevco.com/

Bruel & Kjaer
- Provides transducers and complete systems for the measurement and analysis of sound and vibration in a wide range of applications: noise, vibration, sound quality, modal analysis, quality control, and telephone testing .
- http://www.bkhome.com/

AcSoft - Acoustic & Vibration Analysis Systems
- Supplies vibration measurement systems based on PC systems and software.
- http://www.acsoft.co.uk/

Acoustisoft Inc
- Design and supply pc based acoustic measurement system designed to meet the needs of both hi fi enthusiasts and professionals using standard pc sound cards.
- http://www.etfacoustic.com/

Acoustics Engineering
- Developer of acoustics related equipment and software tools to perform fast and accurate acoustical measurements.
- http://www.acoustics-engineering.com/

ACO Pacific, Inc.
- Manufacturer and supplier of measurement microphones and mic systems, calibrators, sound intensity probes, acoustical/emi isolators, and noise generators.
- http://www.acopacific.com/