Helix Ethanol Fuel Content Tester / Tool A quick, convenient fuel tester with screwdriver functionality added. Testing for ethanol content can help you better plan your fuel system's storage and winterization needs, putting an end to gummed-up carbs and extra springtime maintenance. Add water to line, then add fuel to line, shake, and wait five minutes. Alcohol will separate out of fuel and give you an accurate reading. Features: Measures the percentage of alcohol/ethanol contained in your fuel Doubles as a Phillips and standard screwdriver Comes in a reusable storage tube