AMERICAN OPTICAL CO. MODEL M603B LENSOMETER
Nice cosmetic condition, I do not have a way to test this item, it is being sold as is.
What is pictured is what you will receive. If it is not pictured or stated as included, then it is not included.
Handling time is typically 1-3 days (excluding weekends).
American Optical History -
AO Scientific Instruments History
The AO Lensometer
Note "Lensometer" was an AO Trademark name
AO Promotional photo (~1920) for the first marketed AO Lensometer which was first sold in 1921;
the principal by which we still measure lenses today. In 1916, AO began using the Lensometer in its factory/ branches.
In 1917, it line of Centex lenses was introduced
which were designed by effective power (now the Industry Standard).
This website page shows the lineage of the AO Lensometer over time, an instrument which
is still one of the most important devices in the Ophtlamic Industry today.
Dr. Tillyer in the image above from a 1918 Booklet on the Lensometer
Download this first booklet (4mb pdf)