This Hydrion pH 10.0-12.0 test paper is in a single roll dispenser. Hydrion short range paper shows a distinct color change for each half pH unit. A plastic case accommodates a single 15ft roll of paper, as selected. The pH color chart is printed on the side of the case. Range: 10.0-12.0. 1 Roll/Dispenser; 10 Dispensers/Carton. Micro Essential Lab #: 375.