I think it's time to spring for a new kit. Get the K-2006. You can find it through the test kit page in my signature below. I had been using my old PS-233 and 234 kits, too, but this year I bought a K-2006, too. I still use an OTO kit for quick daily checks on my chlorine and pH, though.
Good to have you back around the forum this year!
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