Bruel & Kjaer Mastoid 4930 - Calibration of bone-conduction hearing aids w/ BOX

Bruel & Kjaer


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Artificial Mastoid designed for the calibration of bone-conduction hearing aids by simulating the mechanical impedance of the human mastoid.

Artificial Mastoid Type 4930 has been designed for the calibration of bone-conduction hearing aids. It consists of a mechanical simulation of the human head, incorporating a built-in force transducer to monitor the output of the device to be calibrated.


  • Objective measurement of hearing aid and audiometer bone vibrator parameters
  • Frequency response and output determination of bone vibrators
  • Design and production testing and calibration of vibrators

Type 4930 fulfils the International Electrotechnical Commission publication IEC 60373 (1990) and meets the requirements of the British Standard BS 4009 (1991) and American National Standard ANSI S3.13-1987 and ANSI S3.26-1981.


Nice shape.  Received from Academic surplus.


  • Bruel & Kjaer Mastoid 4930
  • Wood box



30 Day warranty. We pledge to offer the best service and warranty to all of our customers!  We are extending a 30 Day warranty on this item. This is our way of saying thank you for allowing us to serve you.


This is a genuine product from this manufacturer.


Regardless of the origin of the equipment, documentation provided or identification appearing upon the equipment, the equipment described and offered here is in no way certified for, recommended for, or offered for any specific use. The purchaser agrees that the seller shall not be held responsible or liable for any injuries or damages, whether incidental or consequential, associated in any way with the equipment. The purchaser, by bidding on this equipment, indicates their acknowledgment of, and agreement to the terms of this disclaimer. it is the purchaser's responsibility to have the item inspected and certified by a qualified professional before use!