Yes PUK II is a brand name for a pulse welder and you have a ground
and then the hand peice with a fine needle that delivers the arc. By
lenghtening the ground lead the arc is dimished so that very thin
things weld and don't just blow up and melt. The setting on the main
box could have gone down futher I suppose but this is just jewelers
way of expanding the use of a much needed tool.