Millivolts

Also, as Hall voltage is often on the order of millivolts, the output from this type of sensor cannot be used to directly drive actuators but instead must be amplified by a transistor -based circuit.

For general-purpose digital multimeters, the lowest voltage range is typically several hundred millivolts AC or DC, but the lowest current range may be several hundred microamperes, although instruments with greater current sensitivity are available.

The output of newer so-called "rail to rail" op-amps can reach to within millivolts of the supply rails when providing low output currents.

To prevent this output oscillation, a small hysteresis of a few millivolts is integrated into many modern comparators.