What instrument is used to measure the rate of flow of an electric current?

The milliampere meter is specifically designed to measure small electric currents, typically in the range from microamperes to milliamperes. It functions by providing a direct reading of the current flowing through a circuit, which is essential for various applications in esthetics and other electrical fields. This instrument is particularly important in esthetics as it allows practitioners to monitor the electrical currents used in various treatments, ensuring they are operating within safe and effective parameters.

In contrast, a voltmeter measures the electric potential difference (voltage) across two points in a circuit, while a wattmeter measures the electrical power in watts. An ohmmeter, on the other hand, measures resistance in a circuit and does not provide information on current flow. Each of these instruments serves a distinct purpose, but for measuring the rate of flow of electric current specifically, the milliampere meter is the appropriate choice.