Jobo Comparator 2, Wallner Automatic S

Hi all, I'm printing black & white at home from medium format negs and needed an enlarger timer. I picked up a Jobo Comparator 2 and a Wallner Automatic S from a flea market today for next to no money. I know roughly what they do, but I'd really appreciate any help or instructions anyone has for these.

Kind regards from Switzerland

Simon