Hydrion pH Paper, the ultimate in wide range, general purpose pH papers has a distinct color match at each full pH unit:[0.0][1.0][2.0][3.0][4.0][5.0][6.0][7.0][8.0][9.0][10.0][11.0].
Simply tear off a small strip of pH paper, dip into the test solution, then instantly compare the resulting color with the matching pH color chart.