On Sat, 12 Feb 2005 20:49:24 -0800, "Lane" lane (no spam) at
copperaccents dot com wrote:

It is used in a height gage for measuring hole distances:
from: http://www.mitutoyo.com/catalog/pdf/P-17.pdf
. Allows quick measurement of center-to-center distance between holes.
. Measurable hole diameters: .04"-1.49"

More accurately, used to find one dimension of the location, in
practice, might be somewhere within .005" at best. I have one, prefer
using gage pins and indicator, far more accurate and less bother.

Greybeard.