Galvanometer

[Sarah]

An instrument or apparatus for measuring the intensity of anelectric current, usually by the deflection of a magnetic needle.Differential galvanometer. See under Differental, a.-- Sine galvanometer, Cosine galvanometer, Tangent galvanometer(Elec.), a galvanometer in which the sine, cosine, or tangentrespectively, of the angle through which the needle is deflected, isproportional to the strength of the current passed through theinstrument.

[Ernesto]

a device used to measure small amounts of electric current