A voltmeter
A high-impedance voltmeter is most appropriate.
They call that "voltage" or EMF.
As there are multiple properties of an electrical circuit that can be metered or tested then a multimeter would be useful
The electrical circuit when turned on it is considered closed. By the same token when an electrical circuit is turned off the electrical circuit is considered open.
Electrical devices need an electrical circuit.
It measures the current.
Voltage measures the electrical potential between two parts of an electrical circuit. Also called electromotive force. Voltage provides the 'pressure' to drive electrons round a circuit.
An electrical circuit is an example of an electrical pressure to electrical current convertor.
That's the purpose of the "ammeter".
A multimeter device can measure resistance, current, AC/DC voltage, and it also can determine continuity on an electrical circuit, and its range for current, voltage and resistance is widely variable.
An ammeter measures the electrical current in something. A digital one is calibrated to display through the shunt and convert information from the analog model.
An ammeter measures the current, often in an electrical circuit
An ammeter measures the amount of current flowing through an electrical circuit. It measures amperage.
An ammeter measures the amount of current flowing through an electrical circuit. It measures amperage.
A high-impedance voltmeter is most appropriate.
They call that "voltage" or EMF.
A volt meter will be able to do this operation.