Electric potential is a scalar quantity.
A multi-meter must connect in parallel with the component, whose voltage is to be measured.
When released from rest, positive charges naturally move O in the same direction of the electric field lines and towards higher more positive potential V O in the same direction of the electric field lines and towards lower more negative potential V against the direction of the electric field lines and towards higher more positive potential V O against the direction of the electric field lines and towards lower more negative potential V.
This flow of electrons charge is called the electric current.
For few-charge systems the discrete nature of charge is important.
They often operate digitally in the form of numerical readings.