Which parameter can be directly measured using a clamp meter?

A clamp meter is specifically designed to measure the current flowing through a conductor without needing to disconnect it from the circuit. This is achieved through the principle of electromagnetic induction, as the clamp forms a loop around the wire, allowing the device to detect the magnetic field generated by the current.

While clamp meters can sometimes have additional functions to measure voltage or resistance, their primary and most effective application is for current measurement. Measuring voltage typically requires probes to be placed across the points of interest, and measuring resistance involves breaking the circuit, which is not suitable for a clamp meter's operation. Similarly, capacitance measurement involves disconnecting components, which is outside the practical use of clamp meters. Therefore, current is the most appropriate parameter that represents the main function of a clamp meter.