how to access a Level tool to see if a surface is flat ?

[bialy]

how to access a note8 Level tool to see if a surface is flat ?

 

[B. Diddy]

Try Bubble Level.

 

[bbgpsuser]

The "GPS Status" app includes a bubble level on the main screen along with the compass. https://play.google.com/store/apps/details?id=com.eclipsim.gpsstatus2

 

[z0ove]

Clinometer it's a good one to do that

https://play.google.com/store/apps/details?id=com.plaincode.clinometer