Specifies a standard reference zero for the scale of hearing threshold level applicable to pure-tone audiometers.
BS 2497-1:1968
Original price was: $264.16.$132.00Current price is: $132.00.
Specification for a reference zero for the calibration of pure-tone audiometers-Data for earphone coupler combinations maintained at certain standardizing laboratories
BSI Group , 09/20/1968
