In my experience, I've heard of Hydrometers being off 6 points either way. Put a mark on the Hydro by testing it against a refractometer, at least you'll know where the correct reading is on the Hydrometer....
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in my experience the hydro i had would read higher sometimes and it would also read low sometimes but the refract is more accurate so i would go with what it says
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hey I have a question on the refractometer. from my understanding that the hydrometer is suppost to read higher than the refract. i have a refractometer that i bought but it is reading a higher level then the hydrometer. I have calabrated the refract. i know the refract is suppost to be more accurate. so, is all this information currect.