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"