Extech 407730 Digital Sound Level Meter features:?áAnalog bargraph with 50dB range updates every 40ms; +/-2dB accuracy with 0.1dB resolution; A+C weighting;?áAC analog output;?áRecord Max/Min values over time;?áUtilizes 0.5"(12.7mm) electret condenser microphone;?á40 to 130dB measuring range.