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Mineral Hydrometer
Measures the specific gravity or density of minerals and gems to aid in their identification. Unlike a mineral's color which can vary, specific gravity is one of the most constant physical properties of a mineral.  By measuring it and then comparing the result to a table of minerals listing specific gravities, one can substantially narrow down the possibilities.  Our Hydrometer Kit includes hydrometer, packing tube/hydrometer jar, metric weight set (10 milligrams to 50 grams), instruction manual, worksheets, mineral tables describing 430 minerals sorted by specific gravity along with eight other mineral properties including hardness, streak, color, and luster.

GL-001-004     Mineral/Gem Hydrometer     $79.95
(Sorry, temporarily out-of-stock)

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