Distinct colors indicate each pH unit over the entire pH scale. Single-Roll dispenser, 15-ft roll. Double-Roll dispenser, two 15-ft rolls. Refill, five 15-ft rolls. Ideal for science fairs. Not for measuring the pH of natural waters, such as streams, rivers and lakes. To measure pH in these waters, try our Water Chemistry Test Strip, pH 6-9, item 652729 or, for a wider pH range, our LaMotte Water test kit, item 652927, pH 3.0-10.5.
