• Type 42AB

    The Sound Calibrator Type 42AB is a portable, battery operated calibrator which produces a constant sound pressure level of 114 dB re. 20µPa (equivalent to 10 Pa) at 1 kHz. It is easy to use and requires no corrections for ambi…

  • Type 14AA

    Actuator Supply Type 14AA The Type 14AA is a high-voltage, high-gain amplifier and voltage supply for driving electrostatic

  • AL0010

    The AL0010 provides a convenient platform for testing condenser microphones. It has a fixture for holding a ½" preamplifier (e.g. Type 26AK)

  • 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.

  • Type 51AB

    The Intensity Coupler Type 51AB is a coupler for calibrating the phase response of microphone pairs used for measuring sound intensity, e.g. the Type 40AI and Type 40BI.

  • Type 90CA

    G.R.A.S. 90CA Microphone Calibration System Microphone Calibration in Four Easy Steps: Microphone Registration Level Calibration Freqency Calibration Print Calibration Certificate

  • Type 42AE

    The G.R.A.S. Low-Frequency Calibrator Type 42AE permits microphone calibration at frequencies down to 0.01 Hz for both front and rear-vented microphones. It produces a constant sound pressure level down to very low frequencies.