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A hydrometer is an instrument used to measure the specific gravity of liquids; that is, the ratio of the density of the liquid to the density of water. An alcoholometer is a hydrometer which is used for determining the alcoholic strength of liquids. The liquid to be tested is poured into a tall container, and the hydrometer is gently lowered into the liquid until it floats freely. The point at which the surface of the liquid touches the stem of the hydrometer is noted. The product is very fragile and may come damaged. Contact us and we will send a new one!