Whether the pH of an item is alkaline or acidic can be an
important factor in determining how to treat and store a paper-based
artifact. We find that this pencil is not only quick but most importantly
accurate, which less expensive pens and pencils often are not. A drop of
distilled water on the surface followed by a few quick strokes of the pencil
can tell you in as few as fifteen seconds the pH of the article in question.
A chart is included in the package for quick comparisons.