Which test equipment measures the magnetic field around a conductor?

The device that measures the magnetic field around a conductor is the clamp meter. A clamp meter operates by enclosing a conductor within its jaws, allowing it to measure the current flowing through that conductor without needing to make direct contact with the circuit. As current flows through a wire, it generates a magnetic field, and the clamp meter can detect and measure this field to calculate the current.

In contrast, while a voltmeter measures voltage across two points in a circuit, it does not provide information on the magnetic field. An ammeter measures current running through a circuit, but similarly, it does not measure the magnetic field directly. A multimeter combines multiple functions, including measuring voltage, current, and resistance, but like the voltmeter and ammeter, it does not specifically measure magnetic fields. Hence, the clamp meter is the most suitable choice for measuring the magnetic field around a conductor.