This meter is featured with wide measuring range (30-130dB). It's portable and easy to use and a handy instrument for sound quality control in factory, office, home, school and construction site. Features: LCD backlight for clear reading. Wide measuring range: 30-130dB. Sound level measurement. Min./Max./Lock current value. Hold the measurement data. Manual/auto shutoff. Equipped with sponge ball. Portable and easy to usesuitable for sound quality control in factory, office, home, school and construction site. Specifications: Measuring Range: 30-130dBA Accuracy: 1.5dB Resolution: 0.1dB Frequency Response: 31.5Hz to 8KHz Frequency Weighting Features: A Weighting Display: LCD Display Power Supply: 3 * 1.5V AAA Batteries(not included) Operation Environment: 0-40C 10-80%RH Storage Environment: -10-60C 0-90%RH Dimension: 50 * 33 * 160mm / 1.97 * 1.3 * 6.3in Weight: 82g / 2.92oz Package Size: 21 * 15 * 6cm / 8.3 * 5.9 * 2.36in Package Weight: 130g / 4.59oz Package List: 1 * Sound Level Meter 1 * Sponge Ball 1 * User Manual (English)