Review on Ade Advanced Optics AO 81150 14 Refractometer by Devon Holmes

I've only used it once but I've been impressed, especially given the reasonable price. It seems solid enough and it worked as intended. I like the little flat foot on the bottom that keeps it flat on the counter and prevents it from rolling away. Other reviewers point out that since 0 isn't a point on the scale, the calibration instructions don't make sense. In fact, the instructions appear to be for a different model. To calibrate this model, first prepare a standard sugar solution. Using the gram scale, I measured 67g white sugar + 33g water to get a standard of 67 Brix (Brix = mass percent sugar). Make sure the sugar is completely dissolved, which may require heating. My device's calibration was within a few units, which is about as good as you would expect. (Remember that the accuracy of this calibration check depends on the accuracy of your weight measurements.)