$12 $15
Amazon with Rev X Products, Inc. has the 5oz REV X E85 Super Tester Reusable Ethanol Testing Kit for $12 with free shipping on $25+ or with Prime. 
$12 retail: $15
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gewf631
Ben's cred: 61
Posted 02/18/2021 at 05:25 AM PT
Posted 02/18/2021 at 05:25 AM PT
So, $12 for a clear bottle with markings?
dave_c
Ben's cred: 5746
Posted 02/18/2021 at 01:48 PM PT
Posted 02/18/2021 at 01:48 PM PT
^ Markings are pictured on the bottle, though I suppose if you want to DIY made one, you could start with a clear bottle and science it for the volume differences achieved with different ethanol %. Personally, I pretty much trust the gas station until something doesn't run properly.