Tap screen for point A and point B.
 Instant results for:

-- Vertical :
- A and B grade rods down to 1/4"
- Black and white window for the difference in height from point A to point B 
- Raise the virtual water table by tapping the A rod. 
- Hand interaction for marking grade on real world surfaces.

-- Horizontal:
- Blue and white window for the horizontal run from the two points
- Blue level bar represents the length in the scene

-- Slope:
- Green and black window for the rise per foot
- Green bar shows "plumb" and the fall at one foot

-- Length:
- Yellow window and bar for the distance from A to B
- Measurements to the 1/16"