Has anyone used Sean Terrill's new refractometer formula for determining final gravities? He says that it is "on par" with the accuracy of using a hydrometer. I first learned about it on this Basic Brewing podcast episode, where he discusses the results of testing his new formula with the help of the podcast's audience. The details of the formula, along with an easy to use spreadsheet can be found here: http://seanterrill.com/2011/04/07/refractometer-fg-results/
Any statistics/math people looked into this? Has anyone done their own testing of his new formula?
Any statistics/math people looked into this? Has anyone done their own testing of his new formula?