I've been having issues with gravity readings using my refractometer and hydrometer. They both seem to be off by at least 5 gravity points which i find unacceptable. So i decided to make a reference solution by adding 1/4 lb of table sugar to a pint (1/8 gallon) of water and measured the gravity. Theoretically, the gravity of this reference solution should be 1.092 (correct me if i'm wrong, went by the ppg of table sugar in John Palmer's book).
The hydrometer measured 1.092 on the dot at 80F while my refractometer measured 1.078. WTF? Both my hydrometer and refractometer read 0 with both distilled water and tap water. Is my refractometer broken, or am i missing something?