Fabio & others -

What you need is an inspection eye loupe. Which is a nX lens and
engraved or film
of various scales (inches and mm ) and angles and holes of very small items.
OPTICAL COMPARATOR is a key phrase.

http://www1.mscdirect.com     page 1397  The SPI top left is a standard
inspection
hand lift over a part or set over onto a plate/table... unit used in
Printed Circuit
and IC inspection areas.

In inches - and one in mm. The mm is 300x.  and I believe it states
graticule in .oo2mm
Thus a user can read 10 or 11 of these easily and not 1.2 of the other...
The mag might be to high for .1mm grads.  Real shell size forces the scale.

Closer to reality - maybe :

The bottom unit is like what I have here in my metal shop. :-)
And this will provide the user with more options.  Measure curvature or
angular
dimensions, not just length...

The 7 or 10 x kit of all measuring scales is around $150 USD.

The odd looking /\/\ lines are for thread matching.  Useful elsewhere.

This is small enough to pack in a kit for a field trip. *Item #03183852*
which has reticles 1,5,7,8 and 12 and is 10x.  I'd paste in the web page
but it exceeds line width...
you can search for the item number above directly as well as page 1397
for the group.

MSC is the largest company to company - company.  Very likely a vendor
to the college.
They are to me and have been for years.

Very likely these are available in local machine shop supply company.
But are
next day or 2 day from MSC.


Martin


Fabio Moretzsohn wrote:
> A colleague who many here might know, Patrick LaFollette, is looking
> for a ruler to photograph micromollusks. He posted the message below
> at Mollusca-L, and I offered to post it at Conch-L, since many here
> are interested in micromollusks and photography. Note that he is not
> trying to sell anything, but giving an opportunity for others to save
> some money. It sounds expensive, but Pat did some research and that
> seems to be the going price for a custom-made ruler. He will place the
> order this Friday, so if you are interested, please contact Pat at
> [log in to unmask] <mailto:[log in to unmask]>.
>
> Thanks,
> Fabio M.
>
> ---------------------------
> Hi all,
>
> I've been looking about for some time for a ruler marked in 0.1 mm
> increments suitable for use as a scale in light photography of
> micromollusks.  The quest unsuccessful, I am having one custom made.
> It will be 5 cm long, matte nickel finished steel, with engraved
> rulings black filled.  Much of the cost of a single ruler is in the
> setup of the machinery.  Ordering more than one ruler at the same time
> substantially reduces the per unit cost.  If anyone else on the list
> is interested in such a ruler, or has questions about it, please let
> me know.  Price $117.00 ea. if 2 are ordered, $71.50 ea. for five.
> Delivery is in five to eight weeks.
>
> Pat
>
> Patrick I LaFollette
> Research Associate in Malacology
> Natural History Museum of Los Angeles County
> [log in to unmask] <mailto:[log in to unmask]>
>

--
Martin H. Eastburn
@ home at Lions' Lair with our computer lionslair at consolidated dot net
TSRA, Endowed; NRA LOH & Patron Member, Golden Eagle, Patriot's Medal.
NRA Second Amendment Task Force Charter Founder
IHMSA and NRA Metallic Silhouette maker & member.
http://lufkinced.com/

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