Decibel Meter Handheld LCD Digital Sound Level Tester 30-130dBA Tester Noise Measurement Features: 1. Quality ABS material makes the meter firm, antiwear and durable for long time using. 2. Handheld design and lightweight styling, which is convenient e and carry. 3. LCD display screen, it has high definition, which is convenient to read data. 4. High sensitivity, it has no false alarm,  the measuring range is from 30-130dBA, it will provide an most accurate data for you. 5. Suitable for various occasions, suitable for sound quality control in factory, office, home, school and construction site, etc. Specification: Condition: Material: ABS Measuring Range: 30-130dBA Accuracy: ±1.5dB (at reference sound pressure level, 94dB, 1khz >) Frequency Response: 31.5hz-8.5khz measurement: 30-80,50-100.60-110,80-130, 30-130db Dynamic range: 50dB/100dB Frequency Weighted Characteristics: A and C Digital Display: 4 digits  Resolution: 0.1db Sampling rate: 2 times/second Analog characterization Show: One characterization represents 1dB and the sampling rate is 2 times/second Overload Indicate: the OVER/UNDER symbol AC Dial Number Output: 0.707Vrm s/ full scale, output impedance of about 600 ohm DC Double Output: 10m V/dB, Output Impedance: About 100 ohm Dynamic Characteristics: the reaction rate is FAST and SLOW Microphone: 1/2 inch capacitive microphone Maximum locked: M Ax Power Source: 9V Baatery (Include) Battery Life: About 30 hours Starting Self-check Time: 3 seconds Working Temperature and Humidity: 0-40°C, 10-80% RH Storage Condition Temperature and Humidity: -10-60°C (14 -140 °F), 10~70%RH Size: Approx. 149 x 57mm/5.9 x 2.2in Package List: 1 x Sound Level Meter 1 x Instruction Book