Micro Essential Hydrion Water Finding Test Paper is used to detect the presence of water in any solvent and on any surface. It easily detects water level in gasoline or in non-polar solvents. The paper is white out of the dispenser and in contact with water turns lavender to red. The paper is supplied in a jumbo roll dispenser with a serrated edge for easy tear off of desired paper length and contained in a polypropylene case for portability and protection. Length x Width: 600 x 1/2 inches. 50-Ft/Dispenser. 10/Carton. Micro Essential Labs #: MIC-WF130.