Rion - Model NC-74 Class 1 -Acoustic Calibrator

The Rion NC-74 is a Class 1 (IEC 60942) Acoustic Calibrator. Rion designed and manufacture this precision device which is ideal for field calibration of sound level meters with standard half inch (or 1 inch) microphones. Class 1 performance is assured by the atmospheric pressure compensation system built in to the NC-74. The NC-74 is small, lightweight and conveniently sized to fit in to the cases supplied with Rion sound level meters.