Min/max record with max. hold. Fast or slow response time. A and C weighting selectable. Manual or automatic range. Background noise absorber. Jumbo 3-1/2 digit LCD display with bargraph. Meets IEC651, ANSI S1.4 type 2 standards. Optional RS-232 interface and Windows software (model RS232KIT). Range: 30 to 130 dB. Frequency range: 31.5 Hz to 8 KHz. Accuracy: plus/minus 1.5 db. Resolution: 0.1 db. Sensor: 0.25 in. electret condenser microphone. Power 9 volt battery (w/ DC 9V output). LCD size: 2.5 x 1.65 in. Dimensions: 11 x 3 x 1.5 in. Weight 10.3 oz. Includes hard case, battery, windscreen.