I find with my Hanna digital refractometer, If I leave the sap or syrup whatever I'm testing in the stainless test cup, eye or whatever you want to call it for 20 seconds to let the temp level off it will get a better reading. The temp compensation reading is the numbers on the bottom. And after you test your concentrate put a couple drops of permeate in there and slosh it around to get the eye clean then wipe it. Might have a little residue in there. They are pretty finicky. and 0.2% sugar is basically nothing. I bet if you clean it then test it will be 0.0%
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