What is the piece of equipment used that measures the densities of differerent things?

i think they use them to find pockets of oil, gas, rocks etc.
Answers:
A immensely common instrument for the direct measurement of the density of a solution is the hydrometer, which measures the volume displaced by an object of known mass. A adjectives laboratory device for measuring fluid density is a pycnometer; a related device for measure the absolute density of a solid is a gas pycnometer. Another instrument used to determine the density of a liquid or a gas is the digital density meter - base on the oscillating U-tube principle.

Equipment used in grease exploration involves seismic exploration. See the web site below. Source(s): www.encapgroup.com/drilling/

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