What device is used to measure voltage?

The device that is specifically designed to measure voltage is called a voltmeter. A voltmeter is connected in parallel with the component or circuit section being measured, allowing it to accurately gauge the electrical potential difference between two points. This measurement is crucial in HVACR systems because it helps technicians ensure that the voltage supplied to components, like motors and sensors, is within the required range for optimal performance.

While a multimeter can also measure voltage, it is a multifunctional device that can measure current, resistance, and voltage—making it versatile but not exclusively dedicated to just voltage measurement. The ammeter is used to measure current, while the ohmmeter is designed to measure resistance. Each of these devices serves distinct purposes in electrical diagnostics, but when the task is solely focused on measuring voltage, the voltmeter is the most accurate and appropriate choice.