G.R.A.S. Microphone Calibrators


Sound calibrator or pistonphone design

  • 114 dB at 1 kHz; 114 dB at 250 Hz or 134 dB at 250 Hz calibration levels
  • Available with built in barometric pressure and
  • temperature correctionClass 0 and Class 1 calibration compliance
  • Adapters for 1”, ½” and ¼” microphones

G.R.A.S. calibrators provide a traceable daily calibration reference for your acoustic measurement system.


GRAS 42AG Multifunction Sound Calibrator

GRAS 42AP Intelligent Pistophone



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