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Hydrion Water Finder Sensing Paper Hydrion Water Sensing / Finding Test Paper (WF-130) detects the presence of water on any surface or on any non-polar solvent like gasoline. Especially useful for detecting the presence of water in gasoline. To use, simply tear off a small strip of the test paper, and either dip into the test solution, like gasoling, or place in contact with  surface to be tested. If water is detected, the paper will turn bright lavender to easily recognize. Perfect for checking water in gasoline, checking for water in other non polar solvents or for finding water leaks.  Each kit (roll) is in a protective dispenser that is easy to use. Each roll has a 1/4" wide X 50' long roll of test paper with corresponding color chart to display result. Want more options? Check out the main page here! Do you need a shipping scale?