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Features: -Measurement Range: 30dBA - 130dBA -Accuracy Within +/-1.5dB; Resolution: 0.1dBA -Large LCD screen display; 10 minutes auto power off -Data hold function -LCD backlight display -Max/Min sound level measurement - Uses 3*AAA Battery ¨C INCLUDED - 1 Year warranty Specification: -Frequency range: 31.5Hz ¨C 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 -Size: 190x80x50mm /7.4x2.4x1.9in -Weight: 230g/8.1oz- Please self-provide a [standard 94dB @1KHz sound source], if you need to calibrate the item.Package Include: 1 x Mini Sound Lever Meter