& nbsp; & nbsp; & nbsp; GRAS was founded in 1994 by Danish acoustic pioneer Gunnar Ras musen and is a pioneer and pioneer in the sound and vibration industry. As an important developer and manufacturer in the field of acoustic measurement accuracy, GRAS microphones have advanced measurement microphones and related equipment. This includes applications and solutions for customers in aerospace, automotive, audiology, consumer electronics, and other high demand industries. The measuring microphone of GRAS microphone is developed to support key areas of research and development, sound measurement, and production, therefore thorough testing of the product is necessary. The GRAS microphone adopts a series of "high acceleration life tests" aimed at achieving high quality, long-term durability, and high accuracy that customers expect and trust