Which instrument is used to know the presence of an electric current?

Galvanometer is a very sensitive device which measures the amount of current as well as the direction of current. From the Induction of Current experiment we see that the induced current changes its direction when we move magnet towards the coil and when we move away from it. It is a sensitive device so it is mainly use to find out the presence of current rather than the amount of current.

While Voltmeter is used to measure voltage, magnetic needle is used to find out the presence of magnetic field and fuse is for safety purposes in an electric circuit.