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Demonstration voltmeter. A voltmeter is an instrument used for measuring electrical potential difference between two points in an electric circuit. Analog voltmeters move a pointer across a scale in proportion to the voltage of the circuit; digital voltmeters give a numerical display of voltage by use of an analog to digital converter. A voltmeter in a circuit diagram is represented by the letter V in a circle.
Testing a battery with a voltmeter. Remove the high-tension lead from the coil, so the engine will turn over but not start. You have to put a heavy load on a battery to test its capacity. Some garages use a heavy discharge tester; a similar test, though less conclusive, can be made with a standard voltmeter.