< Here in the US, it's rare to see nanoFarads used as a unit - it's < far more common to see a 2.2nF capacitor referred to as a 0.0022uF < or as a 2200pF unit. This is an extension of the days when < "microFarad" was "mF", and the next subdivision was "micro-micro-Farad" < or "mmF". I have a lot of cap on drawing I've specified as nF and I switched to pF (picofarards 10^-12) back in the late 60s. < I believe that "mmg" is still used as a prefix in medical fields, < but here it means (as far as I can figure out) "millimicrogram". < Can someone correct me on this (I'm sure I'm wrong!) A friend is a toxicologist and with it isn't PPM it's picograms/liter. Allison