Pistonphone NC-72B

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Features

A standard sound source that generates a constant sound pressure of 114 dB at 250 Hz.
It complies with IEC 60942 class LS/M and JIS C 1515 class LS/M can calibrate microphones to a high degree of accuracy.
It is also compatible with JCSS calibration and can issue internationally acceptable JCSS calibration certificates.

Library