Also, for the record - I dip my refractometer in water all the time to clean it off. No ill effects yet, but I also wouldn't be heartbroken since it's a $30 ebay version.
Like others have said, it's a bit hard to read with the dual scale 0-32 versions. I've considered getting a 0-20 and 0-10 brix for more accurate measuring of OG/FG, but I really don't do as much small batch brewing anymore. A hydrometer is so much easier when I'm brewing 5-10 gallon batches.