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The Ingco HETSL01 Digital Sound Level Meter is designed to accurately measure sound levels in various environments. It features a measuring range of 30-130 dB with a dynamic range of 50 dB, and a sound pressure accuracy of ±1.5 dB at both 94 dB@1KHz and 94 dB@8KHz. The meter operates within a frequency response of 30Hz to 8KHz, using a polarized capacitance microphone for precise detection. Additional features include a backlight for easy reading in low light conditions and a low battery indicator. The device is powered by 3 LR03 AAA batteries, included in the package.