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1. An instrument used for measuring small differences in electrical potential.
2. An electrical resistor of fixed total resistance between two terminals, but with a third terminal attached to a slider that can make contact at any desired point along the resistance.
[L. potentia, power, + G. metron, measure]
Etymology: L, potentia + Gk, metron, measure
a voltage-measuring device.
A mechanically adjusted resistance used as a calibration control on many instruments. It adjusts a voltage or current within the device.