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MEEARO decibel meter is designed to meet the measurement requirement of safety engineers, health, industrial safety offices and sound quality control in various environment, which include factory, office, traffic, family and audio system. A practical little tool great for noise pollution monitoring, home theater setup, health and safety compliance, vehicle noise testing, etc.SpecificationsMeasuring Range: 30 ~ 130dBAAccuracy: ±1.5dBAAccuracy: ±1.5dBResolution: 0.1dBFrequency Range: 31.5HZ ~ 8KHZSampling Frequency: 2 times/secMicrophone: 1/2" Electret Condenser microphoneTemperature: 0~40°C/32~104 ºFHumidity: 10~80%RHHumidity: 0~90%RHPower Supply: 3 x 1.5V Battery (included) Dimension: 2x1.3x6.3in/49x33x159mmAuto Power OffLow Battery IndicationMax Hold FunctionOperating ConditionStorage ConditionPackage Include 1 x Sound Lever Meter3 x 1.5V AAA Battery1 x Manual