The AudioTool app is an SPL (decibel) Meter designed to measure sound pressure levels (SPL) and display the measured values on a graph.

The application is based on the concept of a microphone, which is an instrument for detecting sound waves. It is a very sensitive device, and its output signal is converted into an electronic signal, which is then processed and displayed on a graph.

To use the application, you need to connect your phone to your audio source (loudspeaker or headphones. Then, open the application and start measuring. The application will automatically measure the sound level in decibels.

There are different options for measuring the sound level:

1. Single-clap: When the application is running, you can use a loud clap to trigger the measurement.

2. Pink noise: The application can also be used to generate pink noise. This is a special type of noise with a random frequency that can be used as background noise to help you sleep.