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A digital voltmeter is designed to measure both AC (alternating current) and DC (direct current) voltage. This capability makes it a versatile tool in electrical and electronic diagnostics, as it can be used to evaluate different types of electrical signals.

When measuring DC voltage, the digital voltmeter displays the steady voltage level, which is the voltage that does not change over time. This is essential for applications involving batteries and DC power supplies. For AC voltage, the voltmeter often provides an RMS (root mean square) value, which is a standard way of expressing the effective voltage in an AC circuit. This characteristic is crucial when working with household electrical systems or any device that operates with AC power.

While the other options focus on limitations—measuring only one type of voltage or a different parameter entirely—the ability of a digital voltmeter to handle both AC and DC voltages makes it an indispensable instrument in electrical troubleshooting and measurement tasks.