I'm with ya, Lonnie...I got a meter not long ago and decided to do everything I could to prolong the life of the probe.
Martin, I appreciate the details. pH is mainly an issue for me in very light beers, and now that it's pilsner season I'm more concerned about it. Those same beers are ones where I want to maximize my fermentability, so it's good to know that I want to be at the low end of the range.