Buffering capacity

[IDMiamiBob <IDMiamiBob@aol.com>]

I noticed that Mardel's product line referred to as "Waters of the World"
makes reference to buffering capacity being measured in parts per million.
This strikes me as odd, but I guess that I don't really know of any other way
to measure it except to say it is stable, fairly stable, highly stable, etc.
(Certainly not very informative or scientific).

Okay, so does anyone know parts of *what* per million?

Bob Dixon