Product Digital Sound Noise Level Meter Decibel Pressure 30-130dB Features Wild Measurement Range: 30-130dBA, 35-130dBC. Accuracy: up to +-1.5dB. Windscreen for Filter-out Unwanted Signals. With 2 equivalent weighted sound pressure levels A and C. AC & DC analogy signal output are available connecting to frequency analyzer level recorder, FFT analyzer and graphic record. A frequence weighting for general sound level measurements. C frequence weighting for checking the low-frequency content of sounds. Large LCD screen with digits reading. Fast and Slow dynamic characteristic modes. Low battery indication. Portable, easy to use and handy instrument for sound quality control in factory, office, home, school and construction site. Specifications Accuracy: +/-1.5dB (under reference conditions) Measuring Level: 30-130dB (A)/35-130dB (C) Level Ranges: 30-80dB, 50-100dB, 60-110dB, 80-130dB Frequency Range: 31.5Hz to 8.5KHz Linearity Range: 50dB Resolution: 0.1dB Dynamic Characteristic: FAST (high speed)/SLOW (low speed) Self Calibration Time: 3sec Sampling Rate: 2 times/second Microphone: 1/2" Electret Condenser microphone AC Signal Output: 0.707Vrms/ full bar graph, output impedance is about 600ohm DC Signal Output: 10mV/dB, output impedance is about 100ohm Power Supply: 1 x 9V alkaline battery or DC 6V (battery not included) Item Dimensions: 21 x 7 x 3cm Item Weight: 220g