I would get a reading from another source. It sounds like the reagent you got may be no good.
Let us know what you find.
[EDIT] I just saw this link in one of BigDave's posts. That kit is worth looking into (and I almost mentioned it, but haven't bought a kit from Wallyworld in ~4 years, so wasn't sure on the price or if they still carried it). [/EDIT]
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