Sound/Light/Gradienter/Magnetic/Compass meters are built in this application.

This display screen will show the minimum/maximum/average/current values.

Reset button is used to reset all minimum/maximum/average/current values to zero.
Pause button is used to pause a meter. It will stop that meter. It can reduce the power consumption if you don't need use that meter.

It could help you to check the your ambient environment.