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[[File:ACO_Pacific_model_521.png|thumb|ACO Pacific Model 521]]
==Description==
The ACO Pacific Model 521 is a Sound Level Calibrator.
*Frequency: 1000 Hz +/- 1%. 
*Total harmonic distortion (THD): less than 2%

===accessories===

*Aco Pacific model 7012 Free Field microphone
*Aco Pacific model 7013 Pressure Field microphone

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