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  Home > JCE Print > Journal of Chemical Education > Issues > 2000  > December  >
In the Laboratory
Hand-Held Conductivity Meter and Probe for Small Volumes and Field Work
Barry R. Ganong
Department of Chemistry and Physics, Mansfield University, Mansfield, PA 16933
Cover
December 2000
Vol. 77 No. 12
p. 1606
Abstract
A portable conductivity meter and probe are described. They have a unique combination of features that permits use with small volumes in the laboratory or in the field. The probe consists of two graphite electrodes embedded in a rigid plastic tube with a diameter small enough to use in standard 13 x 100-mm test tubes. A moderately high-frequency ac source prevents electrode polarization in highly conductive samples. The output is a 10-element LED bar graph. The device thus provides 10 steps of resolution, sufficient for semiquantitative determination of conductivity in environmental water samples.
More Information
*  Citation
 Ganong, Barry R. J. Chem. Educ. 2000 77 1606.
*  Keywords
 Conductivity; Environmental Chemistry; General Chemistry; Laboratory Equipment / Apparatus; Water / Water Chemistry
*  History
 Created:
Last Updated:		 November 3, 2000
April 15, 2005
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