Handy sound source for quick and easy calibration of sound  level meters and sound measuring systems.
The Calibrator employs solid state integrated circuitry that provides accurate and stable performance. 
Sensitivity calibration of microphones. 
Suitable for field and laboratory use. 
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Model ND9A ND9B
Standards GB/T15173,ANSI S1.40 CLASS2,IEC942
Sound Pressure Level 94 dB 94 dB
114 dB 114 dB
Accuracy 0.5 dB 0.3 dB
Frequency 1000Hz  
Cailbration Of 1’’,1/2’’
Microphones
Power Supply 1x9V 6F22 Battery
Dimensions 142x47x47 mm
Weight 275g(Including Battery)