Compact and lightweight sound calibrator allows highly reliable and accurate measurement anywhere
NC-72A | Pistonphone
Standard sound source that generates a constant sound pressure of 114 dB at 250 Hz.
NC-74 | Sound Calibrator
Sound pressure level: 94 dB ± 0.3 dB
Frequency: 1000 Hz ± 2 %
For Type 1 and Type 2 sound level meters.