Mark Willis wrote:

>   There's a little tiny "Counterfeit detector" at MPJA or Hosfelt,
> that is smaller than pocket sized, runs off 2 AA batteries, wonder if
> it could be changed into a single-EPRom eraser for field use?  <G>

  If you can find the tube to fit!  Original with "Woods glass" filter
is rather small, two electrodes, no filaments.
--
  Cheers,
        Paul B.