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Applied standard: IEC61672-1 CLASS2, Measuring level range: Lo: 30dB~80dB Med: 50dB~100dB Hi:80~130dB Auto: 30dB~130dB, Operating conditions: -20~+60oC/10%~90%RH(Non-condensation), Storage Conditions: -20~60 °C/ 10%~75%RH(Non-condensation) Accuracy: 1.4dB, Resolution: 0.1dB, Frequency Range: 31.5Hz~8kHz, Dynamic Range: 50dB Frequency Weighting: A & C, Time Weighting: FAST 125ms; SLOW ( 1s ), ampling Time: 2 times/second, Microphone: 1/2 inch electret condenser microphone, Dimension(L*W*H): 252*66 *33 mm