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GB/T 15952-1995 Specifications for personal sound exposure meters via email in 1-3 business day ABOLISHED please email coc@codeofchina.com for quotation
GB/T 20441.3-2010 Electroacoustics - Measurement microphone - Part 3: Primary method for free-field calibration of laboratory standard microphones by the reciprocity technique (USD) via email in 1-3 business day VALID
GB/T 20242-2006 Acoustics—Procedures for the measurements of real-ear acoustical characteristics of hearing aids via email in 1-3 business day VALID please email coc@codeofchina.com for quotation
GB/T 20247-2006 Acoustics - Measurement of sound absorption in a reverberation room via email in 1-3 business day VALID please email coc@codeofchina.com for quotation
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