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Introduction This unit was designed according to following standards: A. International electrician committee standard: IEC PUB 651 TYPE2 B. US national standard: ANSI S1.4 TYPE2 Specification Measuring range: 30~130 dBA;35~130 dBC Accuracy: ±1.5 dB Digit & Resolution: 5digits & 0.1 dB Frequency response: 31.5Hz ~8.5KHz Measuring level: 30~130, 40~90, 50~100, 60~110, 80~130 Frequency weighting characteristic: A & C Time weighting: FAST/SLOW Sampling rate: 2times/second Microphone: 1/2 inch polarization capacitance microphone AC/DC output Max reading Barcode indicate the value Overload indication: OVER / UNDER Low battery indication Power: 1.5V AA* 4pcs or DC 6V 100mA adapter Dimension: 256*70*35mm Weight: 308g (including batteries)