Which instrument is used to measure electric current?

An ammeter is the specific instrument used to measure electric current. The standard unit of electric current is the ampere (often shortened to "amp"), which makes the name "ammeter" easy to remember. Other meters measure different electrical properties: an ohmmeter measures resistance, and a voltmeter measures voltage or potential difference. While modern multimeters combine all these functions into a single device, the specific function for measuring current is the ammeter.