Micro Essential Lab 330 Hydrion Short Range pH Test Paper Dispenser, 3.0 - 4.8 pH, Single Roll Short range; pH 3.0-4.8 Plastic case Holds a single 15ft roll of pH paper pH color chart is printed on the side of the dispenser Distinct color changes for each half pH unit Short range; pH 3.0-4.8 Holds a single 15ft roll of pH paper pH color chart is printed on the side of the dispenser Distinct color changes for each half pH unit