A hydrometer is an instrument that is made of glass and consists of a cylindrical stem and a bulb weighted with mercury or lead to make it float upright.
It is used to measure the Specific Gravity (SG) of liquids. In other words the ratio of density of the liquid to the density of water.The SG of water is 1.000 at 4°C.
For example the lower the density of a substance the farther the hydrometer will sink, such as alcohol or gasoline.
A brineometer is very similar to the hydrometer except its used for gauging the strength of a salt solution. The stem is separated into increments of 1.0 to 100% saturation levels.
For example the brinometer is commonly used in the food industry for brining fish. Solid salt is added to fish tanks to give fish an attractive gloss. Sodium Chloride is poured into fish tanks and the brine strength has to be regularly tested and maintained at 70-80% saturation levels.
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