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  • Type 40HF

    The 1" Low-noise Level Microphone System Type 40HF can measure noise levels well below the threshold of human hearing.

  • Type 40HH

    The ½" Low-noise Level Microphone System Type 40HH can measure noise levels well below the threshold of human hearing.

  • Type 40HT

    The ½" Low-noise Microphone System Type 40HT can measure noise levels well below the threshold of human hearing.

  • Type 40HL

    The G.R.A.S. ½″ Low-noise Microphone System Type 40HL measures sound pressure levels well below the threshold of human hearing. It is thus generally suitable for sound-power measurements on even very quiet products. Its very …