Phydrion Jumbo Pencil pH Indicators
A precision method for surface testing pH of a variety of materials. Readings closely approximate those made with a pH interchange meter. Tests are conducted by using distilled water on the surface to be tested, make a mark with the pencil, and wait a few minutes until color stabilizes and match to chart.
Pencils test within full pH range of 0 - 13. Box contains 3 pH pencils.
Pencils test within full pH range of 0 - 13. Box contains 3 pH pencils.