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    PH meter

    I try to calibre my ph pen with sulution 7 ph. but It s still 6.80
    Attached Files

    #2
    No screw to ajust only button presh it 3 sec and release but the pen still 6.80

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    • 9fingerleafs
      9fingerleafs commented
      Editing a comment
      Ph paper strips. Cheap easy reliable

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