Features: 1[LCD Display] Portable noise meter with 2.7in large LCD display screen for easy reading, real time display of current temperature (/H switchable) and humidity. 2[Wide Measurement Range] High accuracy measurement, the measurement range is 30?130dBA / 35?130dBC, the frequency is 31.5Hz?8KHz, 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. Item Type: Sound Level Meter Material: ABS, sponge Model: 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 1KHz Measuring Range: 30-130dBA / 35-130dBC Accuracy: 1.5dB Resolution: 0.1dB Dynamic Range: 50dB / 100dB Overload Indication: OVER / UNDER Frequency Weighting: Characteristics A and C Digital Display: 3 1/2 Digits Analog Bar Graph: 1dB / 1 Bar Graph Sampling Rate: 20 Times/Sec AC Signal Output: 1 Vrms/Full Bar graph Dynamic Characteristics: FAST / SLOW Data Storage Capacity: 15000 Maximum Hold: MAXIMUM Automatic Power Off: After 10 minutes of inactivity Microphone: 1/2in Polarized Capacitor Power Supply: 3.7V Lithium Battery 1000mAh x 1 / USDB 5V Battery Life: 12 Hours (Continuous Use) Temperature Measurement Range: 0-45 Temperature Accuracy: 2 Humidity Measurement Range: 10-99%RH Humidity Accuracy: 5%RH 1 x Noise Meter1 x Manual1 x USB Data Cable1 x Storage Box