Universal indicator can be used to ascertain the pH of a solution, almost exactly across the entire spectrum. Litmus paper, however has only 2 optnz. Frst is your average litmus paper which can only tell you if a solution is acidic or basic n only roughly hw much either way. The other type is far more accurate (again, to the nearest integer), but can generally only measure pH accurately over a small range (eg. 1-4 or 10-14 etc). Therefore, when possible, itz usually more beneficial, more efficient and more accurate to use than litmus paper.