I am considering buying a refractometer and as I look at them online there is a wide range of prices. Some are 20 bucks all the way up to several hundred. Ebay has a bunch listed that I assume have varying degrees of quality/accuracy. Does anyone have one they recommend and how expensive was it? What is reasonable for a hobbyist to pay for one? How many of you find it to be necessary/useful?
Any info would be helpful.