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What is a hydrometer and how do I read one?

What is a hydrometer and how do I read one?

Jul 2, 2010

A hydrometer is used to determine the state of charge of each cell of a battery. The hydrometer will determine the cells specific gravity of electrolyte (its weight compared to water). A hydrometer is a bulb or tear drop syringe which will extract electrolyte from the cell. A float in the hydrometer is calibrated to read in terms of specific gravity. A common...