This Hydrion double roll dispenser holds two 15ft rolls of pH paper with a wide range readable from pH 1-6 & 6-11 (2 separate rolls). The dispenser is constructed of polystyrene with stainless steel cut off lips. This wide range paper has a sharp color change for each full pH unit. The pH color chart is printed on the side of the case. Range: 1-6 & 6-11. 2 Rolls/Dispenser; 10 Dispensers/Carton. Micro Essential Lab #: 149.