Voltmeter
![Demonstration voltmeter](/Images/godic/202502/19/Voltmeter_hg1151.jpg")
![A moving coil galvanometer of the d'Arsonval type.
The red wire carries the current to be measured.The restoring spring is shown in green.N and S are the north and south poles of the magnet.](/Images/godic/202502/19/Galvanometer_diagram.svg1151.png")
![Two digital voltmeters. Note the 40 microvolt difference between the two measurements, an offset of 34 parts per million.](/Images/godic/202502/19/Voltmeter1151.jpg")
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.