Sound Meter is a handy app that can detect sound and measure its intensity in decibels. It also has a built-in decibel meter, which you can use to measure the sound pressure level.

How to use the app:

First, you need to install the app.

Second, open it and start the detection process.

Third, press the Start button and wait for the result to appear.

Fourth, press the Stop button to end the detection process.

Fifth, you can see the results in decibels.

The app has a built-in decibel meter, which you can use to measure the sound pressure level.