The CAL73 sound level calibrator is used to calibrate sound level meters and other sound measurement equipment. You can calibrate 1 inch diameter microphones directly and 1/2 inch microphones using a 1/2 inch adapter supplied with the calibrator.
Conforms to IEC 60942 (2003) Class 2, ANSI SI.40-1984
94dB and 114dB Sound calibrator at 1KHz
Accurate and simple to use
Fits 1 inch and ½ inch microphones