Micro Essential Lab 50 Polystyrene Hydrion Wide Range pH Test Paper Dispenser, 1 - 12 pH, Single Roll Wide range; pH 1-12 Single roll dispenser; plastic case Accommodates a 15ft roll of paper, as selected Papers show a distinct change for each full pH unit pH color chart is printed on the side of the case Wide range; pH 1-12 Accommodates a 15ft roll of paper, as selected Papers show a distinct change for each full pH unit pH color chart is printed on the side of the case