Has anyone had any experience of using Gregory Mitchell's bilateral meter? See http://www.trans4mind.com/metercourse/index2.html (scroll about halfway down the page). There's a downloadable manual available on this page, as well as a link to the manufacturer's website.

I also found these two archived Ivy articles:
http://www.lightlink.com/archive/ivy/iv-14-05.txt
http://www.lightlink.com/archive/ivy/iv-17-03.txt

Any comments or insights?