OT: sort of electronics info

I am currently working on a retrofit of a lagun cnc mill. i was
wondering where i might find large capicaters (sp) and info on test
equipment. such as a way to mesure very low resistances as in the
impedence of motors and what type of osillascope people are using.
It seems that in these groups they dance all around this issue but
in 2+ years of surfing this and other cnc boards i haven't seen much on
this issue except maybe a referance to mouser or Digi-Key
Thanks
Happy Hunting
archie =) =) =)