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BS EN ISO 389-9:2009 2010

$102.76

Acoustics. Reference zero for the calibration of audiometric equipment – Preferred test conditions for the determination of reference hearing threshold levels

Published By Publication Date Number of Pages
BSI 2010 16
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This part of ISO 389 specifies test conditions for determining the hearing thresholds of subjects for the purpose of establishing standardized values for reference hearing threshold levels.

BS EN ISO 389-9:2009 2010
$102.76