Measure distance between two points.
Find it here:
By right-clicking, you can choose between different snaps.
EndPoint - The Endpoint Osnap snaps to the endpoints of lines and arcs and to polyline vertices.
NearestPoint - The Nearest Osnap snaps to the nearest point on a drawing object.
MidPoint - Midpoint Osnap snaps to the midpoint of lines and arcs.
If you hold the cursor still, you will get information about the coordinates and heights.
Once you have clicked on two locations in the model, it will show information about distance and slope.
Click Enter to close the command.