Al, how did you manage to connect the resistor(s) to the stainless rods? I couldnt figure that out, short of using specially tooled terminals, which was the only reason I couldnt continue with my DC model.

BTW, since you seem to have worked on a similar technique, did you find the readings highly non linear over the range? At times it is difficult to resolve the levels, especially at the lower end.

Regards,

Anand