Description: This Digital Sound Noise Level Meter is designed to meet the measurement requirement of safety engineers, health, industrial safety offices and sound quality control in various environments, which include factory, office, traffic, family and audio system. Features: Designed according to following standards: International Electrician Committee Standard: IEC 651 TYPE 2 & ANSI 1.4 TYPE 2. Wild Measurement Range: 30-130dB. 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. Fast rate to pick up the current reading. Slow rate to pick up the reading of average within 1 second. Maximum value holding function to lock up the maximum reading. Equipped with sponge ball. Auto power off design for energy saving. 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) Frequency Range: 31.5Hz to 8.5KHz Linearity Range: 50dB/100dB Digital Display: 5 digits Resolution: 0.1dB Bar Graph: 50 dB scale at 1 dB step for monitoring current sound pressure level display Overload Indication: OVER/UNDER Frequency Weighting: A and C Level Ranges: 30-80dB, 50-100dB, 60-110dB, 80-130dB Self Calibration Time: 3sec Sampling Rate: 20 times/seconds AC Signal Output: 0.707Vrms/ full bar graph, output impedance is about 600ohm DC Signal Output: 10mV/dB,output impedance is about 100ohm Dynamic Characteristic: FAST (high speed)/SLOW (low speed) Power Supply: 4x AA 1.5V alkaline cells (Not included!!!) or DC 6V 100mA Microphone: 1/2" Electrinic Condenser microphone Package content: 1 * Sound Level Meter 1 * Sponge Ball 1 * Operation Manual 1 * DC 6V Cable