Koolertron 2.3" LCD Digital Sound Level Meter 30 ~ 130 dB Decibel Noise Measurement 2.3-inch digital high brightness display Measuring Level: 30 ~ 130 dB(A) (automatic) Wide measuring range: 30 ~ 130 dB Sampling Rate: 20 times / second Frequency Response: 31.5 Hz ~ 8.5 kHz