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The standard describes test methods or determining the attenuation capacity of hearing protection devices such as earmuffs and earplugs, as well as other devices.
This standard is no longer incorporated by reference (IBR) into the Code of Federal Regulations (CFR).
Standards are available for purchase from the American National Standards Institute (ANSI), see webstore.ansi.org, and from the Acoustical Society of America (ASA), see acousticalsociety.org.