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Are you sick of your noisy neighbor? WINIFIN decibel meter is the best choice for you to measure the noise level and make your neighbor stop the noise. This sound level 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.How to open the battery door?1. Remove the wind-resistant ball.2. Push the device out of the case.3. Install batteries to the battery door.4. Assemble the device.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 ℉Humidity: 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 Include1 x Sound Lever Meter3 x 1.5V AAA Battery1 x Manual