>I have experimented with several 'brands'. From my experience, there
>seem to be several that are adequent for desecrate measurements but
>perhaps only a few that are good for unattended monitoring. What is your
>University of Guelph
I'm not at this stage planning unattended monitoring, rather
contemporaneous measurement of pH and DO when I take a water sample.
Unattended monitoring may be something I use in the future, so any
advice on this would be appreciated.