The definitive answer may end up to be "buy something better," but when I bough some larger quantity bottles of juice in different strengths, Freedom Smokes was nice enough to send along plastic squeeze graduated cylinders for mixing. Only trouble is, I find it really hard to see the embossed markings on them to measure liquid correctly. I tried highlighting the individual milliliter markings with a sharpie, but discovered that dipping the tube into the liquid erases them. Has anybody found a better way to deal with this?