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  • Type 41AL

    The series of G.R.A.S. Environmental Microphones are a new, low-cost alternative to Outdoor Microphones, such as Types 41AM and 41CN.

  • Type 41AO

    The G.R.A.S. Environmental Microphone System Type 41AO is a precision microphone unit (IEC 61672) for monitoring the noise of overhead aircraft.