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Old 04-28-2012, 04:41 PM
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The Hanna kits are super accurate but do not respond well to testing errors, even finger prints and micfro bubbles can give you a false reading.

If you're 100% sure you tested correctly your good to go.

Check out the Hanna video http://www.youtube.com/watch?v=kST09KWv9C0
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