Oakton pH indicator paper features a 1.0 pH unit interval across the entire range. Packed in a plastic dispenser with an extra-large color comparator chart, the test paper features vivid and easily distinguished colors provide an instant result. Paper roll measures 1/2" wide x 50-ft long (1.3 cm x 15.2 m), enough for approximately 150 tests. Double-wide continuous paper roll is glove friendly.