I just purchased a portable refractometer. I thought it a good idea since I'd like to collect, and reading about the differences between hydrometers and refractometers, I decided that a refractometer would be the better option. Probably paid too much for it, but with the rest of the sale items in my order and the free shipping, I think I made out fine. If I paid too much, Haha, I'll save a load of money on my livestock! Lewiss should tell you how much livestock is in Miami. You guys are gonna die...