MN School Calibration Announcement

Annual Calibration Process for Hearing Screening Equipment – Audiometers, Tympanometers, and Otoacoustic Emissions (OAE)

Annual calibration of equipment used to screen hearing is recommended by the U. S Occupational Health and Safety Administration (OSHA), the National Institutes of Health (NIH) and the Minnesota Department of Health to ensure the accuracy of each machine’s readings.  Midwest Special Instruments is pleased to announce that calibration sites and dates have been determined for the Spring of 2024.  It is important to pre-register machines for calibration.  You will find instructions for completing the pre-registration process below and the download links to the Right.

Information includes:

  • Calibration site locations with Dates & Times (downloadable)
  • Registration forms (downloadable)
  • Calibration Prices (on the Registration form)
  • Equipment List Form (page 2 of Registration forms document)
  • Equipment labels (page 3 of Registration forms document)


Midwest Special Instruments Contact:  Holli Glendenning,


Download forms and view sites by clicking on one of the buttons below

***Please Note:  2024 will be the last year MSI will be performing Calibration Checks.  Starting 2025, only Full Calibrations will be performed on all instruments. Please budget accordingly***