Sound level meters are instruments typically used to measure the sound levels of various instruments in a standardized fashion. They measure and manage sounds emitted from multiple sources like leisure parks, residential areas, industrial plants, etc. The instrument comprises a preamplifier, a display, a microphone, and a signal-processing channel. With precision and ability, the microphone captures the sound signals, and the signal processing channel converts them to electric waves, which are measured and displayed in the display box. Since the sound singles are typically low, a preamplifier is used to amplify the signals for easy readability.