Meter receives sound through a 1/2 in. condenser microphone. SOUND LEVEL METER DIGITAL WITH NISTcertificate 255mm x 75mm x 25mm 30dB to 130dB

USB cable charger for use with 3M Noise Indicator (Cat. No. 17-987-284) USB charging cable

Alerts users to potentially dangerous noise levels Noise Indicator

Designed for measurement of workplace noise levels and to determine degree of hearing protection that may be required SD-200 Sound Level Meter

USB cable charger for use with 3M Noise Indicator (Cat. No. 17-987-284) X10 USB charging cable