Since the establishment in 1994, G.R.A.S. have been 100% dedicated to developing and manufacturing high-quality measurement microphones and related acoustic equipment. We are founded by the Danish acoustics pioneer Gunnar Rasmussen who for more than 60 years has contributed to the world of sound and vibration with his unique ideas and designs. From the first reproducible 1” condenser measurement microphone that enabled quality measurements and instrumentation for acoustic calibration, Mr. Rasmussen’s ingenuity and foresight led to the world’s most popular acoustic sensor: The 1/2” measurement microphone. Then the 1/4” and 1/8” microphones followed with outstanding dynamic and high-frequency capability that brought higher definition and transparency into impulse noise diagnostics. Many variants have been made available over the years; all based on Gunnar Rasmussen’s original 1” pressure microphone design.

When celebrating our 20 years' anniversary in 2014 we documented the story of our founder, Gunnar Rasmussen. Order your copy of the G.R.A.S. jubilee book.

Innovation

At G.R.A.S., we and our customers benefit daily from Mr. Rasmussen’s exceptional understanding of acoustics, physics, electronics and measurement needs. Not only in R&D but throughout the organisation, we are proud to develop, produce and offer the world's best measurement microphones and accessories. And as a family company, now owned and led by the two sons, Per Rasmussen and Peter Wulf-Andersen, we safeguard our heritage and knowledge to help create new opportunities with our customers. We work with everybody with an interest in sound or noise within the fields of aerospace, automotive, audiology, consumer electronics, noise monitoring, building acoustics and telecommunications, metrology, education, consultancy, legislation and system integration.

Quality

When our R&D team develops a measurement microphone, it must undergo the most demanding tests to prove that it deserves to bear the G.R.A.S. name. Using a series of “Highly Accelerated Life Tests” we ensure that our microphones live up to the high quality and precision that our customers have come to expect and trust. Our HALT tests actively accelerate the lifetime of a microphone by simulating the handling and use it is exposed to in real life situations.
We bake it, we humidify it, we shake it and we even try to break it, just to make sure that you get the very best measurement results every time. Learn more about our microphone HALT testing here.

All our microphones are solely produced in stainless steel and in a quality that allows for a 5 year warranty. Should you by mistake damage the diaphragm on a G.R.A.S. microphone, our special technique enables repair at very reasonable price.

G.R.A.S. is ISO 9001:2008 certified.

Partners

G.R.A.S. is represented worldwide in more than 40 countries by subsidiaries and distributors. Whether you are searching for a multi-channel solution or just a replacement microphone for your sound level meter G.R.A.S. will help solve your needs.

G.R.A.S. Sound & Vibration A/S                         
Skovlytoften 33 
DK-2840 Holte 
Denmark

Phone     +45 4566 4046 
Fax         +45 4566 4047

General requests gras@gras.dk
Order handling grasorders@gras.dk