[sdiy] more about ceramic disc caps

[John Lamb]

This is really dumb, but how do I read the values on ceramic disc caps?  I have a slew that are marked 
differently from anything I have seen before -- "56J" "680J" -- I understand the J is the tolerance rating, in 
this case 5% -- but is this 56 pf?  56 uf?  I'm confused on the units, I guess.

Also I have some taht are marked "120GMV ; 1-3MEG ; L" and "0015M ; Z5F" -- I'm confused on units 
and just this general mess.  Any help is appreciated, and simply tolerating my insipid and amateur questions 
is appreciated, as well.  :)

Thanks again
John Lamb