stereometer

from The Century Dictionary.

• noun An instrument for measuring the solid capacity of a vessel.
• noun An instrument for determining the specific gravity of liquids, porous bodies, etc.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Physics) An instrument for measuring the solid contents of a body, or the capacity of a vessel; a volumenometer.
• noun An instrument for determining the specific gravity of liquid bodies, porous bodies, and powders, as well as solids.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun An instrument for measuring the solid contents of a body, or the capacity of a vessel; a volumenometer.
• noun An instrument for determining the specific gravity of liquid or porous bodies or powders, as well as solids.