1. A reference to the use of an instrument for measuring differences in electrical charges or potentials.
2. Any of several types of instruments which are actuated by the forces between charged bodies and are used to indicate the presence of ionizing radiation and to measure potential differences; for example, an electroscope.

A method of titration in which the end point is detected by measuring the change in potential across suitable electrodes or the change of electric conductance or other electric property during titration (way of determining the concentration of a solution).