Found this plan for a Arduino capacitance meter
only trouble is i cant find a 12M or 0.9M resistor, can i get away with other values? or is there another good Arduino capacitance meter out there?
i cant find a 12M or 0.9M resistor,
Well you won't get 900K but you will get 910K. It shouldn't make any difference. Changing 12M for 10M will change the calibration slightly but it will still work.
thanks mike 
You can also make up values with multiple resistors. It can be a bit messy but it works.
is there a sum for doing that? (can be as simple as 1k + 1k = 2k in serial ? )
[is there a sum for doing that? (can be as simple as 1k + 1k = 2k in serial ? ) /quote]
Yes, resistors wired in series just add up.
Wired in parallel is a little trickier:
Lefty
You star Retrolefty! as they are all in Series on this schismatic, I can just use a mix and match of values I have! 