Customer approved, this refractometer is easy to assemble and use.  With readings ranging from 1.31 to 1.81, it gives the user a clear focus and accurate reading.  Its compact design makes it perfect for jobs on the road if necessary. The refractometer comes with a handy pullout eyepiece, a polarizing filter, a monochromatic filter, and can be used as a light source. See this refractometer and more great tools at Stuller.com/tools.