These test tapes work great but you only have 30 seconds to analyze all 7 test results. Even when well prepared, I find it difficult to do so with close reading. I think it's better to test twice: once to analyze the first 3-4 results, and the second time to analyze the last 3-4 results. If I don't do this the PH result below will be inaccurate as it gets darker and darker showing a higher PH than what is actually in my tank.
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