A Volt meter is used to measure potential difference (a.k.a. voltage).
Potential difference is measured in units called: Volts (V).
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There is no difference between potential difference and potential drop. Both terms refer to the difference in voltage (i.e. potential) across a component. Depending on how you look at it, both terms can refer to positive or negative differences, i.e. drop, for instance, can be negative, implying a rise.
Normal potential is the the potential at 273o K, standard potential is the potential at 298o K, 101325 Pa and concentrations in 1 M.
voltage