The Measure tool allows you to measure the distance between nodes and mesh vertices, in addition to measuring the diameter of thickened lattice nodes.
select a point (in 3D view)
Select a node or mesh vertex in the 3D view. The tool will provide the coordinate of the selected point. If the lattice is thickened, it will also provide the diameter of the node.
select a 2nd point (in 3D view)
Select two points-- it can be a combination of a node and mesh vertex or two of the same type. The tool will provide the distance between the two points. Selecting a new point will measure the distance between that point and the last point selected.
DESELECT A POINT (IN 3D VIEW)
Click a selected point to deselect it.