No, a **voltmeter** is not a vector. A voltmeter is a device used to measure **voltage (potential difference)** between two points in a circuit.
However, voltage itself is a **scalar quantity**, not a vector. This is because voltage has **magnitude** but no specific **direction** in space. While voltage is associated with electric fields and potential differences, which can have directional properties, the measured voltage value does not follow vector addition rules like force or velocity.
So, a voltmeter measures a scalar quantity, and the voltmeter itself is just an instrument—not a vector.