any comments? so if i got ir right in this one, do i have to make compensations in a chart depending the temperature of the sample?
That's the one, although you should use the Brix scale since the manufacturer did the SG conversion incorrectly.
As far as temperature compensation, it has ATC (automatic temperature compensation), so it will give accurate readings from 10-30°C. That's the temperature of the refractometer, not the sample. *But* the ATC tables are calibrated for grape must (i.e. sucrose solutions), so they won't be totally accurate when used for beer. Ideally you should always use the refractometer at 20°C.
It's not complicated for you Mic, all you need to do is plug in your OG and SG and see what the calculator says.
Yeah, I did the hard part!