Hydrion pH Paper, the ultimate in wide range, general purpose pH papers has a distinct color match at full pH units:[1.0][2.0][3.0][4.0][5.0][6.0][7.0][8.0][9.0][10.0][11.0][12.0]. Hydrion pH Paper provides: A direct reading pH paper with the widest range available in a single paper A simple, single color match for all pH values Distinct and easily matched color separations Accurate, reproducible readings with an immediate response. Hydrion 1-12 pH Paper is a general use pH paper that can be used for: Classroom Demonstrations, Hospital Laboratories, General Laboratories, Industrial Testing, Food Service Safety, and Emergency Testing.