Originally Posted by Homercidal
And if you can't, or don't, trust your refractometer for FG readings, you should still buy a hydrometer to have on hand anyway. They are cheap.
So I abandoned my hydrometer and used my refractometer full-time when I got it. The first four batches were spot on after 'correction factors' for FG measurements. All was well.
But the next two batches (high gravity, mid gravity) were over +0.020 off after corrections.
So either don't care about FG accuracy or keep your hydro handy.