QCS is for use with a fuel-tester (checks percent alcohol) and/or can be used alone to instantly verify gasoline is ethanol and water-free. (EG. Marine, Aircraft, Diesel and other specialty type fuels).
* We recommend purchase of a complete test kit (shown above) which includes QCS solution or an individual fuel-tester (checks percent ethanol), so when results are positive you can determine if gas contains alcohol OR water, and verify exact percent % of alcohol. Note: Even very small amounts of alcohol (gas additives) and water in tank will reveal a positive result.