Canon EOS 5D Mark III with L-Series Zoom Lens Owner's Manual

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You can display a grid and electronic level in the viewfinder and on the 
LCD monitor to help correct camera tilt.
1
Select [VF grid display].
 
Under the [52] tab, select [VF grid 
display
], then press <
0>.
2
Select [Enable].
 
Turn the <5> dial to select [Enable], 
then press <
0>.
 
The grid will be displayed in the 
viewfinder.
The viewfinder can display an electronic level using the AF points. For 
details, see Custom Controls (p.321).
Displaying the Grid and Electronic Level
Displaying the Grid in the Viewfinder
Displaying the Electronic Level in the Viewfinder
A grid can also be displayed on the LCD monitor during Live View shooting 
and movie shooting (p.203, 239).