This digital sound level meter is designed to meet the measurement requirements of safety engineers, health, industrial safety offices and sound quality control in various environments, including factory, office, traffic, family and sound system. Features: Designed according to the following standards: International Electrician Committee Standard: IEC 651 TYPE 2 & ANSI 1.4 TYPE 2. Wide measurement range: 30-130dB. Accuracy: up to 1.5dB. Windscreen to filter out unwanted signals. With 2 equivalent weighted sound pressure levels A and C. AC & DC analog signal output is available for connection to frequency analyzer level recorder, FFT analyzer and graphic recording. A frequency weighting for general sound level measurements. C frequency weighting to check the low frequency content of sound. Large LCD display with digital readout. Fast and slow dynamic characteristic modes. Fast speed to pick up the current reading. Slow speed to pick up up the reading of the average within 1 second. Maximum value hold function to lock the maximum reading. Equipped with sponge ball. Automatic power-off design for energy saving. Portable, easy-to-use and practical instrument for sound quality control in factory, office, home, school and construction site. Specifications: Accuracy: 1.5dB (under reference conditions) Measurement 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 steps 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: 3 sec Sampling rate: 20 times/second 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" Electronic condenser microphone Package contents: 1 * Sound level meter 1 * Sponge ball 1 * User manual 1 * DC 6V cable