Ideal for E-10 Applications! Fast, reliable way to detect water in fuel storage tanks. Accurately detects phase separation in Ethanol blend applications. For all petroleum fuels including ethanol and methanol blends, diesel, kerosene, #2 oil, JP-4, JP-5 and more. Works in seconds, even in extreme temperature conditions. Paste will turn yellow-green upon contact with water. Driver-friendly flip cap. User-friendly plastic tube, less mess than metal tubes.