Hey, wait a minute....
This Scammaster thing looks kinda like Dell's old Omnitron stuff that was made by Vernell, except with a red LED numeric display added....
You remember that crap with the hot melt glue that failed to find the hidden coins during Randi's test....
see here....
http://www.geotech1.com/cgi-bin/pages/common/index.pl?page=lrl&file=reports/vr800/index.dat
and here...
http://www.randi.org/jr/200511/111805setback.html#i9
Best wishes,
J_P