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42AA GRAS Audio Analyzer

The G.R.A.S. 42AA is a high-precision, battery-powered pistonphone—a reference sound source designed for calibrating measurement microphones, sound level meters, and similar acoustic instruments

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42AA GRAS Audio Analyzer

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Detail

Feature	Details
Sound Pressure Level	114 dB re. 20 μPa at 250 Hz (105.4 dBA with A‑weighting)
Frequency	250 Hz
Standards Compliance	Meets IEC 60942 Class 1; achieves Class 0 performance when used with a precision barometer (e.g., GRAS RA0168)

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