Eureka! Quickly and accurately measure an object’s mass and volume—with one apparatus! How is this possible? This unique balance utilizes Archimedes’ principle of fluid displacement and buoyancy force—the same principle used to explain why a 500-ton battleship floats on water. Use this device to measure the mass and volume of solids and liquids, then calculate their densities. Comes complete with plastic 100-mL graduated cylinders with end caps and bases, plastic inner flotation tubes with end caps and an instruction manual. Square flotation tube is 18 mm x 18 mm x 195 mm. Works great with Specific Gravity Metal Specimen Set (AP9234) and the Equal Mass Kit (AP4636).