12 Refractometer for Measuring Sugar ConcentrationMy digital refractometer shows the sugar content to be just under 13% which is just about right for a standard "premium" beer. Boiling is over. Next I pump the wort out the bottom and back in the side of the kettle creating a whirlpool effect. This helps the hop residue and crud (called "trub" in German) to settle out. Next stop....