Features:1. Professional sensor for excellent sensitivity and precision2. The quality of the sound can be measured in various environments without contact, and the test results can be displayed quickly and accurately.3. High-intensity backlight screen display for easy reading at dim environment.4. With automatic shutdown function, automatic shutdown after 3 minutes without operation, energy saving and environmental protection5. Widely used in automotive noise testing, industrial equipment noise testing, home noise testing, etc.Specification:Condition: 100% Brand NewBrand: SMART SENSORModel: AS804Accuracy: 1.5dBFrequency Range: 31.5Hz to 8.5HzMeasuring Level: 30-130dBAResolution: 0.1dBOver Range: LCD show OverTime weighting: FastMax: Maximum holdMin: Minimum holdPower Supply: 3 * AAA 1.5V alkaline cells(not included)Microphone: 1/2 inch Electret Condenser microphoneOperating Temperature: 0-40Operating Humidity: 10%-80%RHStorage Temperature: -10-60Storage Humidity: 10%-70%RHWeight: Approx. 111g / 3.9ozSize: Approx. 155 * 50 * 25mm / 6.1 * 2.0 * 1.0inPackage List:1 * Digital Sound Level Meter