A general name for instruments which detect the presence of (but do not necessarily measure) small electrical charges by electrostatic means Compare to electrometer
An instrument for detecting the presence of electricity, or changes in the electric state of bodies, or the species of electricity present, as by means of pith balls, and the like
A device that enables you to determine if two objects have opposite or like charges By following the instructions in the Electricity & Magnetism Module of the Patterns in Nature course, you can construct an electroscope