检流计，一种电流表，用于测量微弱电流。其工作原理与磁电式电流表基本相同。

检流计在不使用时，须将两端短路，以减少对检流计的伤害。

1820年，奥斯特发现，当电流流过导线时，导线旁的磁针会发生转动。该现象可用于电流的测量。1820年，德国物理学家Schweigger发明电流计。

A galvanometer is an electromechanical instrument for detecting and measuring electric current. The most common use of galvanometers was as analog measuring instruments, called ammeters, used to measure the direct current (flow of electric charge) through an electric circuit. A galvanometer works as an actuator, by producing a rotary deflection (of a "pointer"), in response to electric current flowing through a coil in a constant magnetic field.