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Think about what actually defines how this meter works. A clamp-on meter is identified by its hinged jaw that clips around a single conductor. The device reads current by sensing the magnetic field produced by that conductor, so you can measure current without breaking the circuit or making contact with the wires. That noninvasive, clip-around design is the key trait.

An analog meter is defined by its needle and dial display, which could be used for many measurements, not specifically current. A digital thermometer measures temperature with a temperature sensor, not electrical current. An oscilloscope shows voltage versus time to visualize signals, which is more about waveform display than measuring current with a clamped conductor. So the description that points to a clamp-on meter fits best because it highlights the distinctive clamping mechanism used to measure current.