Product Description: - Comply with IEC-61672-1 2002 Class 2 - Fast, Slow, Impulse response time. - Frequency range: 31.5Hz ~8KHz. - Measurement range: 30dB~130dB. - Dynamic range:100dB. - A/C/Z frequency - Storage up to 32,000 records. - USB interface. - AC and DC output. - Bargraph display. Specifications:       Display    3 1/2 digit backlit LCD display with maximum reading of 1999        Display refresh rate    1 time / per second        Applicable Specifications    - IEC 61672-1 : 2002 Class1 - ANSI S1.4 Type 1 - CNS NO.7129 Type1 - JJG-188-2002 Class1        Microphone    1/2" pre-polarized condenser microphone        Measurement items    30dB ~ 130dB (A), 35dB ~ 130dB (C), 40dB ~ 130dB (Z)        Measurement range    randomly,10s,1m,5m,10m, 30m,1h, 2h,4h,8h,16h,24h        Dynamic Range    100 dB        Integrate Time Setup    randomly,10s,1m,5m,10m, 30m,1h, 2h,4h,8h,16h,24h        Max. peak C sound level    measurement 70~133 dB        Time weighting    Fast, Slow, Impulse, Peak        Frequency weighting    A/C/Z        Frequency Range    31.5Hz~8KHz        DC output    10mV/dB        AC output    2Vrms/130dB        Battery Life    About 30 hours        Power    LR6 1.5V*4 Alkaline batteries(not included package)        AC Adapter    100V~240V        Dimensions    285(L) x 90(W) x 39(H) mm        Weight    550g ( including Batteries)