For sale is a Foucault test set-up. This was made by a skilled ATM'er and tool maker. Features a micrometer-adjusted stage, adjustable light source (has slit, pin hole, open, and a lens arrangement). I have to admit I don't know that much about it except it is very well made. Please e-mail with any questions and I will try to answer them. Additoinal images are available.
Asking $55 shipped. Will accept check or paypal.
Thanks for looking!