One roll of pHydrion Insta-Check testing papers is supplied in a plastic, protective dispenser with a color chart for simple, single color matching. This 1/2-inch paper tests one of the widest pH ranges available in a single paper with each full pH unit showing a distinct color change and provides accurate, reproducible readings from an immediate response in bright colors that last. Length x Width: 600 x 1/2-inch. Total pH range: 0.0-13.0. Color match at 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][12][13.0]. Micro Essential Labs #: HJ-613.