Calibration Service

At GRAS, we are focused not only on the reliability of our products, but also on the precision and repeatability of your measurements. GRAS equipment is, therefore, calibrated and verified according to international standards, and the calibration data is included with every product leaving our premises.

Calibration at regular intervals is a way to safeguard the quality of your measurements and to eliminate the costs caused by unreliable equipment. Also, it is a way to ensure that historical measurement data is valid and comparable.

Depending on the use, measurement environment, and internal quality control programs, we recommend that microphones are calibrated at a dedicated calibration laboratory at least once a year.

We endorse our ISO/IEC 17025:2017 Accredited Calibration Laboratory in Denmark and the GRAS Microphone Calibration Centers located in Asia, Europe and North America. Please see the below table:

  GRAS Microphone Calibration Centers


  China   GRAS China
  India   Aimil Ltd.
  Japan*   Foresight Techno co. Ltd.
  Singapore   TME Systems Pte Ltd.
  South Korea   FAMTECH Co.


  Denmark*   GRAS Denmark
  Germany*   GRAS-Tippkemper

  North America

  USA*   DGI Metrology/Dimensional Gauge Company

* Calibration centers offering accredited calibration.

We offer calibration with fast turnaround time. For larger series of equipment, you can make a calibration agreement to minimize the turnaround time.

These are the calibration services that we offer:

See technical note on Periodic Verification of Measurement Microphones under Technical Notes and Application Notes