Jan, I use this kit.
http://www.amazon.com/Taylor-Technol..._1272977011_11
I know it s more expensive and takes longer, but it is accurate and I've been able to stabilize my pool levels. I now test once a week.
Skip, congrats! Where did you buy it? Are you home now?
Have fun on your trip to Tennessee!
Second day of dealing with a cold. I hate being sick.