I just kegged a wheat today and measured the FG with my refractometer and hydrometer. With the refractometer I get 5 brix, after accounting for the OG of 1.048 that reads as about 1.003. Meanwhile, the hydrometer reads at 1.011. Both are calibrated and temperature adjusted. Also, I am always within 2 points when comparing the two prior to fermentation.
Is this because I am measuring a wheat which typically have more particles in them than most other beers? This is the first time I have used my refractometer for FG calculations.