Greisinger GSH 8922 Phonometer

Compensation?of?the?background-noise?for?measuring? sound-sources?in?the?fore-ground.?Weighting?of?the? sound?level?via?two?weighting-fi?lters?according?to?the?IEC? standard.?Assignation?of?the?max/min?value?during?one? measuring?period.