Quote:
The best kit I have used to check alkalinity is from Cole-Parmer (800)323-4340. It's a Titrets Test Kit for total alkalinity (part # u-05540-66, $27.50). Get the one that tests from 10-100 ppm, as it measures from 10-20 ppm in increments of one. This kit may be available elsewhere. It is extremely easy to use, and very repeatable.
I posted this some time ago, and it should still be accurate, although the price might have increased.