Amprobe SM-10 Sound Meter, IEC 651 Type 2 A weighting for quiet to moderate ambient sound levels, and C weighting for loud ambient sound levels Fast response setting for environments with steady sound levels, and slow response settings for environments with fluctuating sound levels Windscreen shields the microphone from wind when taking outdoor measurements Maximum or minimum reading mode displays the highest or lowest reading in a session to track sudden increases or decreases in measurements Data hold function keeps a reading on the display even after the meter is disconnected or the measurement changes Designed to meet the measurement requirements of Safety Engineers, Health, Industrial safety offices and quality control in various environments Measuring ranges: A Weighting 30 ~130dB C Weighting 35~130dB Display with 0.1dB steps on a 4 digits LCD CE, designed to meet IEC651 Type2, ANSI S1.4 Type2 Data Hold to freeze reading on digital display