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Sound Level Meter | Labotronics Labotronics sound level meter class 2 standard portable meter providing manual setting operation with ± 1.4 dB accuracy measure and quantify sound levels in the environment. A built-in microphone capture signal (both AC and DC components).The AC/DC frequency analyzer separates the AC component (varying sound) from the DC component (constant background). A and C frequency weightings reflect the sensitivity of the human ear at different frequencies. The processed signals are converted into decibels (dB)and display sound level.