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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 voltmeter.

calibration potentiometer

A mechanically adjusted resistance used as a calibration control on many instruments. It adjusts a voltage or current within the device.
References in periodicals archive ?
Matt, Flow-Injection Potentiometry by Poly(vinyl chloride)-Membrane Electrodes with Diphosphoryl-dicarboxylicacid-p-tert- butylcalix[4] arene Ionophore for the Determination of Th(IV) Ions, Anal.
This can be avoided by measuring sodium by direct potentiometry, which would require clinical laboratories to convert to this system from the more common indirect ISE method.
1996, "Analysis of fluoride in rain water: comparison of capillary electrophoresis with ion chromatography and ion selective electrode potentiometry," J.
Redox potentiometry in mitochondrial and photosynthetic bioenergetics.
His research interests include microelectromechanical systems, piezo-electrically tuned electro-optic devices, and applications of scanning tunneling potentiometry.
A case in point is more than half a century old electrode potentiometry technology, which still holds strong market position, although better sensing technologies have been available for some years.
pH was determined by potentiometry with a glass electrode, using a digital pHmeter QUIMIS, following the technique of AOAC (2005).
For measurement of serum electrolytes, many laboratories employ ion-selective electrodes (ISE) that utilize indirect potentiometry, in which patient samples are diluted before the measurement process.
Log (protonation constant K) of the conjugate base 61 by potentiometry as described elsewhere (34), (52).
O-cresolphthalein complexone method was used to determine CaT [14], ion selective electrode direct potentiometry for [Ca.
Sodium concentration was determined by potentiometry and plasma osmolarity was then calculated using the following equation:
51 Model 1: Analysis of Current study paired samples by indirect potentiometry with the Hitachi 747 analyzer (Roche Diagnostics, Indianapolis, Ind).