what is a poor man's oxyprobe??

updated wed 13 nov 02

Nick Molatore on tue 12 nov 02

CLAYART Digest - 10 Nov 2002 to 11 Nov 2002 (#2002-312)There was a post =
from george koller that mentioned "poor man's (try $35) Oxyprobe"=20
What is this???
-Nick