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The multimeter is the correct choice for measuring voltage in electrical systems because it is a versatile instrument designed to measure multiple electrical parameters, including voltage, current, and resistance. For voltage measurement, users can set the multimeter to the appropriate setting and then connect its probes to the circuit, allowing it to display the voltage level accurately.

While the other tools mentioned have specific applications, they do not serve primarily to measure voltage. An amperemeter, for example, is specifically used to measure current, which is an entirely different electrical property. A tachometer measures rotational speed, making it irrelevant to voltage measurement. An oscilloscope, while capable of displaying voltage over time and analyzing the waveform of electrical signals, is generally more complex and used for detailed analysis rather than basic voltage measurements. Thus, the multimeter stands out as the essential tool for directly measuring voltage in various electrical systems.