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Comply with IEC-61672-2002 CLASS II Easy To Use Competitive Price Dynamic Range 100dB Excellent Quality This is a high performance class II integrating Sound Level Meter. It measures Lxyi, Lxyp, Lxeq, Lxmax, Lxmin, LAE, SPL, Sel, Lcpeak, function. FEATURES ª Fast, slow, Impulse response time. ª Wide frequency range: 31.5Hz~ 8KHz ª Wide measurement range: 30dB~ 130dB. ª Wide dynamic range: 100dB. ª A/ C/ Z frequency weighting. ª Data stored up to 32, 000 records and auto mating transfer to micro SD card. ª USB interface. ª AC and DC output. ª Bargraph display.