This Hydrion Vivid double roll dispenser holds two 15ft rolls of Hydrion paper with a wide pH range of 1-11. Excellent in low 1-6 range. The dispenser is constructed of polystyrene with stainless steel cut off lips. This wide range pH paper has a sharp color change for each full pH unit. The pH color chart is printed on the side of the case. Range: 1-11. 2 Rolls/Dispenser; 10 Dispensers/Carton. Micro Essential Lab #: 159.