Precision chassis measurement

["atrav" <atrav@copper.net>]

I need a better way to make sure chassis measurements are proper, especially 
over long distances.
Usually I mangle a measuring tape, or drop a point to the garage floor, but 
sometimes there are just
things in the way, plus not every measurement is two dimensional.
Are there pointers that I can bolt to a tube of conduit, to reach in, or???

-Aron-