Specification for a reference zero for the calibration of pure-tone audiometers. Normal threshold of hearing for pure tones by bone conduction.
STANDARD published on 25.7.1972
Designation standards: BS 2497-4:1972
Note: WITHDRAWN
Publication date standards: 25.7.1972
The number of pages: 7
Approximate weight : 21 g (0.05 lbs)
Country: British technical standard
Category: Technical standards BS