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Fonometro -Digital Sound Level Meter ATTEN AT-SM1357 DESCRIZIONI:Measuring range 30~130 dBA; 35~130 dBC Accuracy ±1.5 dB Digit & Resolution 5digit & 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 ? Overload indication OVER / UNDER Low battery indication ? Power 4pcs 1.5V AA or DC 6V 100mA adapter Standard Quantity Per Carton 20pcs Standard Carton Size 66.9*45.8*30.7CM Standard Carton Gross Weight 17.5kg