Testing for Ethanol in gasoline

[Gerald]

Does anyone have any experience with testing gasoline to see if it contains Ethanol?

I am thinking of getting some kind of test "kit" to check the gas where I buy for the boat and lawn mowers.

It looks like there are some kits that only cost about $ 20, but I wonder if they give reliable results. Some of the test are where you put a drop of test chemical in a small sample and if it turns blue (?) it has Ethanol in it.