Leaton Professional DL1358 Digital Sound Level Meter /Decibel Meter Decibel Logger 30-130dB ,35- 130dBC(9V Battery Included) Compact and lightweight, come with a portable carrying case, convenient to take it out for testing Measuring range: 30dBA~130dBA, 35~130dBC ,Accuracy1.5dB Frequency response31.5Hz~8.5KHz,Samping rate:fast:125m/times; slow:500m/second Microphone1/2inchpolarization capacitance Time weightingFAST(fast)ISLOW(slow)