[2-Pack] Reusable Ethanol Testing Kit - Wide Mouth Fuel Test Bottle for E85 and Ethanol Levels - Fewer Spills and Clear Results in Minutes - Test Hundreds of Times - Two Ethanol Test Bottles Included

They worked great and arrived quickly. Having two testers work well for self blending.

Follow the simple directions and you can check your ethanol levels in minutes! High quality. Affordable. I tested 0% ethanol

Simple easy to use, works as expected.

got them fast

These are a must if you want to keep track of how much Ethanol you are putting in your tank. Very easy to use and read. I recommend these to anyone who wants to test their fuel. These are a great value for your money

Did what it was supposed to do. Just a little messy.

Very useful. Before this, I had bought a tank of (what I thought was) ethanol-free gas for my 1964 tractor. On filling the tank on my tractor, it started raining gas all over the engine. My gas turned out to have ethanol in it, which dissolved the seals on the gas shutoff valve. It took a great deal of time and effort to replace that shutoff valve; this testing kit will help me to ensure beforehand what kind of gas I've purchased!

These do work quite well when you fill them to the proper levels. They’re large enough that it’s easy to fill with fuel/water without overshooting the line. Easy clear to read lines and numbers. HOWEVER, my reason for the review being only 3/5 is due to the brittleness of the product. After the 2nd use of one of the bottles, it tipped over and cracked. Since it was cracked it no longer sealed and fuel spilled everywhere. If you’re going to buy these, be careful to not knock them over.