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For sound level measurements in extreme conditions, at high altitudes or high demands on the accuracy of the measurement results, sound level meters should be checked prior to the measurement with a sound level calibrator.
Also for calibration and verific
http://www.peaktech.de/productdetail/kategorie/schallpegelmessgeraete/produkt/peaktech-8010.html
http://www.peaktech.de/productdetail/kategorie/schallpegelmessgeraete/produkt/peaktech-8010.html