The Hydrion Mechanical pH Pencil measures the pH of any surface to the nearest full pH value. The Hydrion pH pencil can be used to test irregular or uneven surfaces, and is also effective on porous material and impervious solids. It offers clear bright single color matches at every 1.0 interval from pH 0.0-13.0.

The color chart has pH matches at [0.0][1.0][2.0][3.0][4.0][5.0][6.0][7.0][8.0][9.0][10.0][11.0][12.0][13.0]

The pH Pencil is used to detect acid or alkali residues and may be used to measure the pH of any of the following:

Paper, Lumber, Concrete, Cement, Plasterboard, Pre-painted surfaces, Painted Surfaces, Textiles, Skins, Ceramics