Digital Pen Type PH Meter Waterproof Pocket Portable PH Meter PH Value Measurement and Control Instrument

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2

4.0

-0.3%

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-7%

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-3%

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-6%

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-2%

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-6%

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-0.3%

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1

5.0

-0.9%

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-0.5%

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-0.4%

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-4%

Incomplete data

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-2%

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1

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-14%

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4.8

-2%

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-0.3%

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-9%

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-0.6%

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-9%

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Incomplete data

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-0.5%

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-3%

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1

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3

-3%

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-4%

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-1%

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3

-5%

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-2%

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-0.1%

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5.0

-5%

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-12%

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-2%

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1

-0.9%

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1

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6

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5.0

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