How to Use Your pH Pencil

How to Use Your pH Pencil

pH pencils are an accurate way of measuring the pH of any surface to the nearest whole value.

The term pH refers to the negative logarithmic concentration of the positive hydrogen ion (H+).  The “p” stands for potential or power like power of ten, which an exponent, in this case a logarithm.  The “H” stands for H+, which really has reference to the hydronium ion (H3O+) formed by an H+ combining with H2O.

Using a pH pencil gives you a way of measuring the acid concentration of the base surface with the term "acid" referring to a compound that lowers the pH of the solution by donating a hydrogen ion/proton (H+), and the term "base" referring to a substance that accepts a hydrogen ion/ proton (H+).

These pencils can be used to measure the pH of...

  • Cosmetics
  • Skin Care
  • Concrete
  • Construction & Industry
  • Textiles
  • Paper manufacturing and many more applications.


Any surface, be it porous material or impervious solids, pH pencils will give you an accurate reading of the surface pH.

Please note:  The water you use MUST BE DISTILLED WATER! Not tap water, not spring water, not bottled water... only use distilled water available at most grocery and hardware stores.

How to use

To measure the surface pH..

  • Wet the surface with distilled water.
  • Mark the surface with the pencil.
  • Wait approximately 15 seconds and compare the resulting colour change with the colour chart.

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Posted on 11 07 2018 How To, View All 0

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