G.R.A.S. Low Noise Microphone Systems Feature » Microphones – Sub Threshold of Hearing Measurements

Low noise microphone systems from GRAS Sound and Vibration have the capability of making measurements of sound levels that are below the threshold of hearing and below the electical noise floor of the standard 50 mV/Pa measurement micrphones.  Using the GRAS low noise microphone systems noise floors from 5 dBA to less than 0 dBA can be achieved.