[pinhole-discussion] needle measurer

[Christina Z. Anderson]

Does anyone know where I could find a.....is it called a micrometer, a
gauge, or what....it is a small plate that has a series of holes in it that
will measure needles to the hundredth of a millimeter?  I don't even know
what it is called to look for it.  Apparently it is not a jeweler's item,
and is not available at the hardware store, because I have tried both places
(unless I want to measure drill bits).
Chris