Refractometer reading off
I've used this refractometer for sugarwashes before. It is an alcohol ref. 0-80% abv. yes i calibrate it. it also has atc. I typically use it to monitor my progress trough a run, to know when to stop distilling.
here's the thing: my current wash im running is 3.5kg sugar, 700g store bought grain products for flavor. thats for 20 liter. At the very end [of my stripping run] im getting a reading of 25-30% and i know by taste that it doesnt have any more than 4% abv at most.
could it be fusel oils in late tails of my stripping run?
[EDIT]