On a related note, there's an old script for Daz Studio by Delta X15 (http://forumarchive.daz3d.com/profile.php?mode=viewprofile&u=295560)  that brings up a dialog box showing the the objects size in all three dimensions.  It can switch between various Metric and American units.

The two major limitations is that it shows the size of an object at its widest, ie a character in the default 'Cross-Pose' has a width of over 5 feet.  To get specific node width, you have to select only that node.  Also, I don't think it adjust for angle, so a two meter person laying at a 45 degree angle would be reported as having a 'height' of about 141cm along the Y axis.

Still, very handy, for a six year old script.  I keep it as a custom action on my toolbar. :)  Orgininally heard about it in a Daz Forum (See: http://forumarchive.daz3d.com/viewtopic.php?p=3414212)

Download from (in case the Daz Archive is off-line): http://www.4shared.com/dir/722776/10801f63/DS_Scripts.html

Whole list of Deltas Scripts: http://www.4shared.com/dir/722776/10801f63/DS_Scripts.html#dir=Gl1KlH4s