Specification for a reference zero the calibration of pure-tone audiometers Data wide-band artificial ear complying with BS 4669
€172.00
Specification for an artificial mastoid for the calibration of bone vibrators used in hearing aids and audiometers
€281.00
Normal equal-loudness contours for pure tones and normal threshold of hearing under free-field listening conditions
Electric hearing aids; connecting cords for earphones
€24.39
The normal threshold of hearing for pure tones by earphone listening
