Endevco (UK) - Supplier of dynamic instrumentation for vibration, shock, inertial motion and dynamic pressure measurements, including a line of accelerometers, pressure transducers, microphones, electronic instruments, and calibration systems. HEAD Acoustics - Test systems in the areas of sound quality evaluation, noise and vibration troubleshooting, binaural recording and playback, and telecommunication systems testing. ACO Pacific, Inc. - Manufacturer and supplier of measurement microphones and mic systems, calibrators, sound intensity probes, acoustical/emi isolators, and noise generators. Acoustics Engineering - Developer of acoustics related equipment and software tools to perform fast and accurate acoustical measurements. 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. AcSoft - Supplies vibration measurement systems based on PC systems and software. Cirrus Research plc - Manufacture acoustic measurement instrumentation, such as sound level meters, environmental noise monitoring equipment and airport noise monitoring systems. Lansmont Corporation - Provides field data recorders, test equipment and testing services to prepare products and packages for their specific transportation environment. 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. Unholtz-Dickie Corp. - Manufacture complete vibration test systems including shock and vibration controllers, electrodynamic shakers, head expanders, power amplifiers , transducer calibration systems and instrumentation. Castle Group Ltd - Manufacturer and supplier of sound level meters and vibration meters. Sales, rental, training, calibration and consultancy services available. Gracey & Associates - Sound and vibration meter hire and calibration service in the UK.