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.
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.
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.
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.
Better testing means better products -The headphone market is expanding rapidly these years. Advances in technology have allowed for not only production of headphones in a wide range of types and forms, but also improved performance and connectivity. More Details: New Headphone Testing
The 45CC Headphone Test Fixture is for dual-channel testing of headphones and headsets, and it is built on our vast experience in the field. With a focus on multiple configuration options and accurate and repeatable test results, the test fixture can easily be adapted to many different headphone/headset designs and sizes. 45CC 45CC Production Line...
The G.R.A.S. AL0030 Production Line Acoustic Test Chamber- is for acoustic production line testing of mobile devices. It provides a flexible platform that can be configured to suit specific requirements. S&V Samford Instruments Ltd. More Details: Acoustic Test Chamber
G.R.A.S. has developed a wide range of acoustic sensors and dedicated accessories for testing in both anechoic and hard-walled wind tunnels in the near and far field, at low and high wind speeds. S&V Samford Instruments Ltd. More Deatails: Acoustic sensors Brochure
Head and Torso Simulator - G.R.A.S 45bb KEMAR Head & Torso Simulator : s&V is a configurable acoustic research tool that simulates the changes that occur to sound waves as they pass a human head and torso. Its equivalent with mouth simulator is G.R.A.S. 45BC KEMAR Head & Torso, non-configured S&V Samford Instruments Ltd. More details: G.R.A.S _KEMAR
CCP Microphone Sets -Standard -Special -Necessories LEMO Microphone Sets -Standard -Special -Necessories S&V Samford Instruments Ltd. More Details: G.R.A.S Microphone Sets
The G.R.A.S. Accredited Calibration Laboratory is accredited by DANAK, the Danish Accreditation Fund. This accreditation is a quality label that proves that our calibration laboratory complies with the ISO 17025 standard for laboratories. ----Brochure
HALT- the G.R.A.S. quality mark for your Data Safety HALT refers to the Highly Accelerated Lifetime Tests, which is also the quality mark of G.R.A.S. The HALT test of G.R.A.S. is created to confirm their microphones can perform under a real life situations. S&V Samford Instrument Ltd More Details: HALT
The G.R.A.S. 67TS-1-CL Turbulence Screen Kit- is designed for aeroacoustic testing in solid-walled wind tunnels. s&v More Details: G.R.A.S Turbulence Screen Brochure
Sound Power Testing - Sound Power made easy The hemispheres will hold and position the measurement microphones according to the standards and have been designed with focus on your workflow -------------------------- More Details: G.R.A.S hemispheres
The 42AC is an extremely stable laboratory standard sound source which can also be used for field calibrations – it retains its high accuracy even under hostile environmental conditions.