Which device can measure both voltage and resistance?

A multimeter is a versatile instrument designed to measure multiple electrical properties, including voltage and resistance. It typically comes equipped with different settings to allow users to switch between measuring direct current (DC) voltage, alternating current (AC) voltage, and resistance.

When measuring voltage, the multimeter is connected in parallel with the circuit component, while to measure resistance, the multimeter is connected in series with the component. The ability to perform these functions makes the multimeter an essential tool for troubleshooting and analyzing electrical circuits, as it provides a comprehensive way to assess both voltage levels and the resistance of components.

In contrast, other devices mentioned in the question have more limited functions. A galvanometer can detect and measure small quantities of current but is not primarily used for measuring voltage or resistance. A voltmeter specifically measures voltage but does not have the capability to measure resistance. Lastly, an ohmmeter is specifically designed for measuring resistance only and cannot measure voltage. This specialization in measuring both properties is what makes the multimeter the correct choice.