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-5%

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-3%

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1

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6

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2

1

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-2%

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5.0

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5.0

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5.0

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1

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4

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4.0

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0

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5.0

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-0.6%

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1

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-0.4%

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0

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1

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-4%

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4

4.0

-4%

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1

5.0

-0.3%

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1

-3%

New portable water quality tester 0.1 high accuracy ph meter measurement range ph pen for household drinking water aquariums

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0

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-25%

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1

1

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1

1

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1

0