Which tool is commonly used for measuring voltage?

The tool that is commonly used for measuring voltage is the voltmeter. Voltmeters are specifically designed to measure the electrical potential difference between two points in a circuit and are calibrated to provide readings in volts. This makes them essential for assessing voltage levels in electrical systems, ensuring that components operate within their specified voltage ratings.

While a multimeter can also measure voltage, it is a versatile tool that can perform multiple measurements, such as current and resistance, and isn't exclusively focused on voltage alone. An ammeter is intended for measuring current, while a frequency meter measures the frequency of an electrical signal. Thus, the voltmeter stands out as the dedicated instrument for voltage measurement.