joulemeter

from The Century Dictionary.

• noun Any form of energy-meter in which the joule is used as the unit of work or energy.

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

• noun An integrating wattmeter for measuring the energy in joules expended in an electric circuit or developed by a machine.

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

• noun Any of various devices used to measure energy (in joules)