Awesome. <img src="/images/graemlins/smile.gif" alt="" />

Yeah, I knew that the volume of water really didn't change, but the length of time does (and that length is also based on salt concentration/conductivity). I didn't know it was 2.75ml. That gives a nice target for a home-brew setup. I might have to stop and get a pool test kit tonight. Oh, and some pencils in the back-to-school aisle. <img src="/images/graemlins/grin.gif" alt="" />

The best part is that anyone could make a field expedient unit from a toy! Maybe we can get Les Stroud to try it on his show.