CEM DT-8851 Sound Level Meter Measuring Range: 30 ~ 130dB, Dynamic Range: 50dB, Ferquency Range: 31.5 ~ 8KHZ with USB Interface Conforms to the IEC61672-1 Class 2 and ANSI S1.4 Type 2 standard for sound level measurement MIN and MAX sound level hold Over range / under range display A & C frequency weighting Fast (125ms) and slow (1s) time weighting Analog AC/DC output for connection to frequency analyzer or X-Y shaft recorder. USB interface for computerized digital sound level recording