A voltmeter is an instrument used for measuring the 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.
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8508A Vector Voltmeter from Agilent Technologies, Inc.
Model 2003B 4 1/2 Digit DC Voltmeter Newport Electronics, Inc.
Model 244A Electrostatic Voltmeters from Monroe Electronics Inc.
EMA 1710 Analog voltmeter from Saelig Company Inc.
DMS-20 Series Digital Panel Voltmeters from Hoyt Electrical Instrument Works Inc.