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National Physical Laboratory, London www.npl.co.uk
Physikalisch-Technische Bundesanstalt (PTB) www.ptb.de/index_en
National institute of Metrology & Standardisation, Brazil (INMETRO) www.inmetro.gov.br/english/
American Institute of Ultrasound in Medicine www.aium.org
Hangzhou Applied Acoustics Institute http://www.hariutc.com/en/ for a useful source of low frequency hydrophones suitable for open water applications
Institute of Physics www.iop.org
IEEE - Ultrasound Ferroelectrics & Frequency Control www.ieee-uffc.org/
Acoustical Society of America http://asa.aip.org/
Regional Medical Physics, UK www.rmpd.org.uk/links/links_ultrasound.htm
Institute of Sound & Vibration, Southampton, UK www.ISVR.soton.ac.uk
Photoacoustic Imaging Group, University College, London http://www.medphys.ucl.ac.uk/research/mle/
Oxford University ,BUBL,(Biomedical Ultrasonics and Biotherapy Laboratory ) http://www.ibme.ox.ac.uk/bubl
Santec Systems Inc www.santecsystems.com
Acoustic Polymers Ltd www.acousticpolymers.co.uk/
National Instruments (LabView software) www.ni.com
Lecroy (Digital Oscilloscopes) www.lecroy.com
International Electrotechnical Commission www.iec.ch/
