Waterbear, I figured the MSDS might not list everything but I wasn't really sure. I haven't had the pleasure of reading too many of them! I see what you mean about how they can make something sound a lot worse than it really is. So the lack of a neutralizer could give a potentially false HIGH reading? The reading I'm getting with the Taylor pH is actually lower than the numbers I'm getting with my other test kits. Thanks for the tip on the first Alk reagent. I'll take some readings with and without a drop of the sodium thiosulfate to see how it affects it.

Amir, I'm interested to see what you find out with the new calibration solution. I'm really hoping that you find that your meter ends up matching the Taylor pH after all.