The oscilloscope's sensitivity was set to detect a single millivolt change in the signal.

The sensor's output varied by only a few millivolts during the experiment.

To measure the tiny signal accurately, the engineer calibrated the oscilloscope for millivoltage readings.

The sensor recorded unexpected millivoltages during the thermal cycling test.

She used a millivoltmeter to measure the tiny voltage produced by the thermocouple.

The lab ordered several millivoltmeters to improve the sensitivity of the measurements.