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A VOLTA-METER is a device used to carry out electrolytes and a VOLTMETER is a high resistance device used for measuring potential difference or voltage between two points in an electrical Circuits. - See more at: http://www.electricaltechnology.org/2012/12/what-is-difference-between-volta-meter.html#sthash.fS8xqxky.dpuf
The first is the device the other is the measurement unit
The device and measurement unit
Voltameter - Used to measure electric charge (Coulomb is Unit of measurement)
Voltmeter - Used to measure potential difference between two points in an electric circuit (Volt is Unit of measurement)
Please note both are Measuring Devices .............
Voltameter measures Charge ..................
Voltmeter measure Voltage ...............