Yieryi Portable Ph Meter Ph Tester 0-14 PH Pen Type Precision Instrument With Ph Buffer Power Ph-20/Ph-220/Ph-20w/Ph-220w

-3%

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0

1

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1

1

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1

1

5.0

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5

5

5.0

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1

2

-1%

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0

0

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2

1

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2

8

5.0

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0

0

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1

1

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2

1

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0

0

-0.4%

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1

1

-12%

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1

2

5.0

-2%

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0

0

-6%

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0

1

-0.9%

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0

1

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5

9

5.0

-1%

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0

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2

5

2.5

-5%

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3

4

4.3

-4%

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0

1

-0.4%

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1

1

-0.9%

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0

-6%

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1

2

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0

3

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1

2

5.0

-5%

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0

0

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1

0

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1

0

-4%

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0

0

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0

-2%

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1

0

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3

2

-0.2%

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0

0

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0

0

-0.2%

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1

0

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0

0

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0

-0.7%

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0

1

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2

1

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0

0

-5%

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1

1

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0

0

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0

1

-0.6%

High precision digital ph meter tester 0-14 pocket ph tester pen aquarium accuracy 0.1 ph (20c) 0.2 ph 100% brand new

1

1

5.0