2 Pack e85 Ethanol Tester Bottle, E85 Fuel Gasoline Octane Level Tester with Wide Mouth and Bold Markings Design, Clear Results in Minutes

This product is useful for classic car and racing enthusiasts, for entirely different reasons. Modern gasoline contains ethanol, which absorbs water and can cause rust in old vehicles. Classic car enthusiasts can test ethanol content (or confirm lack of ethanol) in the fuel.For modern racing, high-ethanol fuel is used and this bottle is useful to determine exact ethanol percentage.The bottle is made of clear plastic. It is thick, but the bottle still bends slightly if you squeeze it. I would have preferred thicker plastic that does not bend, or a glass bottle.Markings are painted, and appear to be painted very well - I could not scratch them off.The screw-on cap has round plastic-looking lining on the inside similar to those you find in drink bottles. I am not sure if that will last when exposed to gasoline, but you can replace it later with another seal.The bottle's total volume is 150ml -- it is larger than how it appears in pictures. Each test will need about 100ml of fuel. You low-ethanol fuel you can reclaim gasoline after testing (and it will have much less ethanol in it)From the practical standpoint, the bottle is a bit hard to fill directly from a fuel container. You first need to put gasoline into a beaker or use large syringe and them fill the bottle.This bottle can make a good gift for your car mechanic.