American National Standard Electroacoustics - Simulators of Human Head and Ear - Part 5: 2 cm*2 Coupler for the Measurement of Hearing Aids and Earphones Coupled to the Ear by Means of Ear Inserts (a modified nationally adopted international standard)
standard by American National Standards of the Acoustical Society of America, 07/21/2014

Method of Measurement of Performance Characteristics of Hearing Aids Under Simulated Real-Ear Working Conditions
standard by American National Standards of the Acoustical Society of America, 11/08/2021

American National Standard Electroacoustics - Simulators of Human Head and Ear - Part 3: Acoustic Coupler for the Calibration of Supra-aural Earphones Used in Audiometry (a nationally adopted international standard)
standard by American National Standards of the Acoustical Society of America, 05/15/2015