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An ammeter is the instrument specifically designed to measure the flow of electric current in a circuit. It is connected in series with the circuit so that the current flowing through the circuit also passes through the ammeter, allowing it to quantify the amount of current, typically measured in amperes (A).

In contrast, a voltmeter measures the electrical potential difference (voltage) between two points in a circuit and is connected in parallel, not suitable for measuring current directly. An ohmmeter is utilized to measure resistance in electrical components, providing information about how much opposition a device offers to current flow, which is a different electrical property. A thermometer, on the other hand, measures temperature and has no relation to measuring current flow in electrical circuits. Each of these instruments serves a unique purpose in the field of electrical measurements, highlighting the specialized function of the ammeter in current measurement.