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.
1. The accuracy is very depened on your device, especially the light/magnetic meter.
2. If you find some value is too larger, it maybe affect health. Recommand to buy a real accurate meter to double check it.