Nice little profile projector made by Erenreich Photo-Optical (EPOI)
The screen size is only 6" but it's perfect for the work I do. One of
the problems in making small parts is that you quickly go beyond what you
can measure with hand tools. Because a lot of shops have switched over to
digital equipment, these older projectors and toolmaker's microscopes are
starting to hit ebay and other sites at affordable prices (this one was
about $400) Increments on the thimbles are .0001 and magnification is 20X
(other lenses are available). The small retainer clip shown on the
screen is 3mm across