Feature:1. [LCD Display] Portable noise meter with 2.7in large LCD display screen for easy reading, real time display of current temperature (/ switchable) and humidity.2. [Wide Measurement Range] High accuracy measurement, the measurement range is 30130dBA / 35130dBC, the frequency is 31.5Hz8KHz, the resolution is 0.1dB, and the accuracy is 1.5dB.3. [Data Storage Function] Allows to store up to 15,000 sets of data, connect to a computer through a USB cable, support data record download, real time sampling analysis, graphics and data printing.4. [Multiple Functions] Equivalent weighted sound pressure level of A and C, fast and slow dynamic characteristics mode, AC and PWM signal output are available, low battery indicator, automatic and manual power off.5. [Widely Used] Equipped with a sponge ball and storage box, small and light, suitable for noise measurement and monitoring in many industries such as traffic roads, automobile measurement, mechanical processing, home furnishing, and libraries.Specification:Item Type: Sound Level MeterMaterial: ABS, spongeModel: AS844+Purpose: Suitable for noise measurement and monitoring in many industries such as traffic roads, automobile measurement, mechanical processing, home furnishing, reading halls, etc.Calibration Sound Source: 94dB at 1KHzMeasuring Range: 30-130dBA / 35-130dBCAccuracy: 1.5dBResolution: 0.1dBDynamic Range: 50dB / 100dBOverload Indication: OVER / UNDERFrequency Weighting: Characteristics A and CDigital Display: 3 1/2 DigitsAnalog Bar Graph: 1dB / 1 Bar GraphSampling Rate: 20 Times/SecAC Signal Output: 1 Vrms/Full Bar graphDynamic Characteristics: FAST / SLOWData Storage Capacity: 15000Maximum Hold: MAXIMUMAutomatic Power Off: After 10 minutes of inactivityMicrophone: 1/2in Polarized CapacitorPower Supply: 3.7V Lithium Battery 1000mAh x 1 / USDB 5VBattery Life: 12 Hours (Continuous Use)Temperature Measurement Range: 0-45Temperature Accuracy: 2Humidity Measurement Range: 10-99%RHHumidity Accuracy: 5%RH.Package List:1 x Noise Meter1 x Manual1 x USB Data Cable1 x Storage BoxNote:Do not place the product in an environment that is too corrosive, humid and high temperature.