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  • Type 42AA

    he Pistonphone Type 42AA is a precision sound source for calibrating microphones. It is battery operated and produces a constant sound pressure level of 114 dB re. 20µPa (equivalent to 10 Pa)

  • Type 42AC

    The Pistonphone Type 42AC is a precision sound source for calibrating microphones. It is battery operated and produces a constant sound pressure level of 134 dB re. 20µPa (equivalent to 100 Pa) at 250 Hz, or 125.4 dBA re. 20µPa…

  • Type 42AP

    The G.R.A.S. Pistonphone Type 42AP is a battery-operated, precision sound source for accurate and reliable calibration of measurement microphones, sound level meters and other sound measuring equipment.