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Re: What are those “numbers” on the side of a battery hydrometer?
Posted to Technical Discussion Forum on 1/21/2006

[...trimmed text...]

Hi Ken,

Well, it's the metric system. A cubic meter of plain water weighs 1000 kg or roughly 2200 lbs. Sulfuric acid is denser than water, and that's what those numbers show, the specific gravity of... Login to read more.