I'm so ready for af test kits...
I wouldn't expect any alkalinity titration kit to be different in that regard.
From link below:
"Of course, most reefkeepers measure alkalinity with a test kit, not with a pH titration. How does that work?
Well, in effect test kits do a pH endpoint titration. They all include pH indicating dyes (providing a color change) and an acid (frequently dilute sulfuric acid) to lower the pH. You typically add acid until the dyes turn color. Since these dyes are selected to have a color change in the pH = 4 to 5 range, what you get is a measurement of how much acid it takes to lower the pH to that range. This color change is used to approximate the endpoint of the titration."
http://www.advancedaquarist.com/2002/2/chemistry




