EASY MEASUREMENTS
in the upper right corner of your screen now it will continuously measure for you between any 2 left mouse clicks
note when you start up 3D Graphics the upper left corner
Then after two clicks it displays the distance
Below i clicked on the two place indicated by the arrows and voila! the distance is displayed
Here's a close up of the information
NOTE: To change the color of the items in upper right corner
simply select Gearbox
select General and then Text Color