

⛽ Know your fuel, own the road – test smarter, drive safer!
The REV X E85 Super Tester is a compact, reusable gasoline ethanol testing kit designed to accurately measure ethanol content from E10 to E90 blends. Featuring a laminated, fade-resistant label and easy-to-use design, it helps protect engines from ethanol-related damage and optimize fuel efficiency. Trusted by thousands, this tool is essential for anyone using or mixing ethanol-blended fuels.









| ASIN | B073HLSVHX |
| Best Sellers Rank | #13,459 in Automotive ( See Top 100 in Automotive ) #12 in Fuel Pressure Testers |
| Brand | REV X |
| Customer Reviews | 4.7 4.7 out of 5 stars (2,351) |
| Date First Available | January 16, 2018 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 0.634 ounces |
| Item model number | ST0501 |
| Manufacturer | Rev-X Products, Inc. |
| Manufacturer Part Number | ST0501 |
| Model | REV-X Super Tester |
| OEM Part Number | ST0501 |
| Product Dimensions | 1.5 x 1.5 x 6 inches |
M**E
Handy tool for checking E blends
Makes it easy to test and get an accurate ethanol percentage when mixing different blends. Works well, just wish the cap opening was a little larger to pour into. Still a solid and reliable tester.
J**K
Simple
Quality, easy to use
K**T
As advertised
Fill to water line, add fuel to fill line. Shake, let rest a few minutes. Separates out and let's you know the amount of ethanol in your fuel. If you interested in that. Works great
H**Y
This tester is great if you have a vintage vehicle.
I think this tester is the best thing you can have if you have an old vintage vehicle. generator(s), lawn equipment or anything with a carburetor or throttle body injection with rubber gas lines. With this tester you can tell if the fuel you are purchasing is high quality or very low quality. I tested every gas station in my area and discovered that every station here is selling very low quality gasoline. After removing the ethanol from the fuel, the octane rating is only 84 Octane which is very bad for your engine. Selling gas at this octane rating is illegal. This weekend, I'm driving 30 miles out of my way to purchase 25 gallons of REC 90 gasoline without Ethanol because I'm tired of having to rebuilt or replace my carburetors, fuel lines and spark plugs.
T**9
Simple and effective. Could be priced a little better.
It's simple and works well. I have no other way to judge/test the accuracy but it seems it's accurate. I had 87 octane "with up to 10% ethanol," and it tested within that tolerance. In another project/test I removed the ethanol (and water from humidity) from some stabilized fuel that was sitting for 2 years in a generator (and wouldn't run) in an attempt to make it usable and ethanol-free and this time it tested to zero ethanol as it should so I put it back in the generator as well as my lawnmower (I had a lot of old fuel I bought and stabilized for that generator) and it's been running great. It's so incredibly simple I feel it can't cost more than $1.00 to make. That said, I feel the price could be a lot lower. It's a small bottle with a cap and a label, nothing more. Good luck!
A**.
can use any type of bottle of similar size and shape
works as designed
C**L
Good ethanol testing device
I saw this used on the Chickanic YouTube channel and purchased it. It is simple to use, just add water to the indicated level and fill the remainder with the gas being tested, shake vigorously, and let set for several minutes. If the water is above the level it was originally filled to, there was ethanol in in the gas and the new level shows the percentage. This happens because that the ethanol in the gas joins with the water and increases the apparent water level. If you purchase 'ethanol free' gas from a pump that does not have a dedicated hose for that gas, you get whatever was in the hose and pump (up to 1/3 gallon) of non ethanol free gas delivered to your fuel container before the ethanol free gas is delivered.
J**R
Perfect
Tests very accurately
R**N
La graduación es una etiqueta pegada, si lo manejaran con graduación grabada directo al mismo recipiente te estaría mejor..
R**N
Fait son boulot mais prix excessif
B**T
Seems expensive for what it is..I’m quite sure you could make one of these yourself but it would be necessary to have a good quality bottle and a way to calculate the ratio and get it marked on the bottle: Short version is this works well , fast and accurate. I’m amazed at the difference in premium gasoline and regular!!
J**I
Thanks to Amazon I got my money back otherwise it would have been £25 down the drain. Some Einstein at their warehouse decided to put an adhesive product sticker right over the read off label which itself is a VERY poorly adhered sticker onto what is a VERY poor quality plastic bottle. Seriously You are better off just getting a 100ml glass measuring cylinder, the type used in school chemistry labs, and using one of those. I reported this to the seller and whilst they apologised there was no offer of a replacement or refund so once again thanks Amazon.
S**S
Easy to use with clear instructions. Have used it a few times to verify the amount of ethanol in the fuel. It takes the guesswork out of knowing what is in the fuel.
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