Hydrion Insta-Chek pH Paper, the ultimate in wide range, general purpose pH papers has a distinct color match at each full pH unit:[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][14.0] Hydrion Spectral Single Roll 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 Spectral Single Roll pH Paper is a general use pH paper. A sample of its diverse pH applications include: Classroom Demonstrations Hospital Laboratories General Laboratories Industrial Testing Food Service Safety Testing Emergency Testing Agricultural Testing