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The Ingco HETSL01 Digital Sound Level Meter is built for accurate sound measurement across diverse environments, offering a measuring range of 30–130 dB with a 50 dB dynamic range and ±1.5 dB accuracy at both 94 dB@1KHz and 94 dB@8KHz. It operates within a 30Hz to 8KHz frequency response and utilizes a polarized capacitance microphone for precise sound detection. Key features include a backlight for visibility in low-light conditions and a low battery indicator. The meter is powered by three LR03 AAA batteries, which are included in the package.