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Overview: Proster Mini Sound Lever Meter utilizes a 1/2 inch electric condenser microphone to monitor sound levels 30-130dBA at an accuracy of +/-1.5dB with 0.1dBA resolution while reducing the effects of wind noise to produce more accurate readings. The MAX/MIN button will hold the highest/lowest reading until a much higher/lower reading is picked up. Together with 3 AAA battery, it can provide you about 50 hours of use. This Mini Digital Sound Level Noise Meter will automatically power off after no operation for approximately 10minutes. Features: Measurement Range: 30-130dBA Accuracy Within +/-1.5dB; Resolution: 0.1dBA Large LCD screen display; 10 minutes auto power off Data hold function Max/Min sound level measurement Uses 3 AAA battery(Included) Specification: Frequency range: 31.5Hz-8kHz Range: 30-130dBA Microphone: 1/2 inch electric condenser microphone Calibration: Electrical calibration with the internal oscillator Display: LCD 3 digits Standard applied: IEC 651 type 2, ANSI S1.4 type 2 Please self-provide a [standard 94dB @1KHz sound source], if you need to calibrate the item. Package: 1 x Mini Sound Lever Meter 3 x AAA battery 1 x User Manual