Pyle PSPL01 Mini Digital Sound Level Meter.Freq Range: 31.5 Hz-8 Khz.Measuring Level Range: 40 To 130 Db.Accuracy: /- 3.5 Db @ 1 Khz, 94db (under Reference Conditions)..5" Electret Condenser Microphone.Newly Designed Housing This sound meter measures from 40 to 130 dB with an accuracy of 3.5 dB. It uses a 0.5' electret condenser microphone for accurate sound measuring. The digital display offers 0.1 dB sound resolution with fast time weighting. Uses C-type frequency weighting. Powers off automatically after 15 minutes of inactivity. Includes microphone wind screen and a 9 V battery for up to 50 hours of battery life.