This app is able to measure in dB the noise level inside a room or outside.
The decibel (abbreviated dB) is the unit used to measure the intensity of a sound, this app provides an approximative way to measure in dB, it's not the same as a real Sound Meter but it can help anyway.

You are able to calibrate the value of dB with 2 buttons called minus and plus
With theses buttons you can adjust the sound level according to the measurement you might get from a real tool.

Start now listening to a place and find out if it is quiet or noisy by monitoring the decibel level from 0 to 100 dB, by watching the graph you can also see the changes during a short period of 30 seconds and then it will show again the variations after erasing the previous 30 seconds period.

This measurement tool will also tell you the AVG dB the Minimum dB and Maximum decibels measured during a long period of time, as long as the app is open.