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Hydrometer

Hydrometers are commonly comprised of a liquid container having a top opening and defining a measuring chamber, and a pointer pivotably mounted inside the measuring chamber. Ball-type hydrometers use balls of different specific gravity to continuously measure the specific gravity of the fluid. When a ball of a known specific gravity floats at the surface of the liquid, it is known that the specific gravity of the fluid is greater than the ball. By identifying which balls float on the surface of the liquid, the specific gravity of the liquid can be identified within a given range. Hydrometers have been used for many years to test the freezing points of coolant liquids in motor vehicles. Typically, these hydrometers have utilized float tubes with appropriate internal scales that provide a reading of the freezing point based upon the specific gravity of the coolant fluid. Visual hydrometers which indicate the liquid level and the specific gravity of a liquid are well known for many applications, including checking of storage batteries. It is frequently necessary to check the level of the electrolytic in storage batteries installed in vehicles or the like and the anti-freeze level in cooling systems of vehicles. Battery hydrometers for indicating whether a battery is adequately charged or in need of recharging have taken many forms.

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