Specific Gravity Refractometer??

I had some trouble with the ferments not fermenting out far enough.
Starting around 1080 and finishing around 1020.
They didn't taste very sweet though. I thought I'd double check with the old fashioned hydrometer and it's telling me more like 990. So it seems my process is OK but the meter isn't. So is the refractometer stuffed or did I just by a piece of cheap crap? Or am I just doing it wrong?
It seamed kinda idiot proof, it still says 0000 on plain water?!?
It was just a straight sugar wash.

The bit of googling I just did says maybe not so good for FG.
Anyone got an opinion or tip on this?


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