Mike,

Get in touch with CMI in Chicago - Elk Grove Village area.  Think they are
still in business.  The principle is eddy current transmission though
segmented conical probes.  Think the probe tips used to be divided into 3
sections each, so you had 9 paths though the copper of a through hole.
Worked pretty well in the early 90s to assure a mil of copper plating in
holes.  Saw it used at two large captive shops in the Midwest back then.
Both are gone now - what's a captive board fabrication shop these days.

Denny Fritz
MacDermid, Inc.

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