General Category > Equipment and Software

Is hydrometer calibration linear?

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Titanium Brewing:
I did not know that. Everything I have always read says use distilled. Thanks.

oregonianredbird:
Old thread, but I wanted to point out that the calibration is not necessarily linear. Yesterday, I mixed solutions of known specific gravity using sugar and water. At low gravities (1-1.020) my hydrometer reads 0.004 too high. But at a gravity of 1.083, my hydrometer reads exactly 1.083. I suppose this can happen if the marking on the paper were printed a hair too far apart from each other.

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