Don't let contaminated fuel ruin your racing weekend. Use Fuel Hydrometer Kits to measure your fuel's specific gravity and be confident that it meets the acceptable limits. The methanol kits are compatible with the methanol calculations provided by Weather Stations. Simply and accurately check the percentage of ethanol content in your E85 pump gas with Fuel Sample Testers from Pit Stop USA. Simply add water to the water line and then fill the rest of the way with your fuel in question. Shake it up and let it set for a few minutes and there will be a line of separation telling you what percentage your fuel really is - it's that easy!