Hydrometer Simple Battery TesterHydrometers (density meters) measure the specific gravity of liquids. In the case of battery testing, the hydrometer is measuring the specific gravity of the battery's electrolyte. The higher the acid concentration in the electrolyte, the higher the specific gravity.
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Hydrometers(density meters) measure the specific gravity of liquids. ... In the case ofbattery testing, thehydrometeris measuring the specific gravity of thebattery'selectrolyte. The higher the acid concentration in the electrolyte, the higher the specific gravity.