Conductivity is a measure of a solution's ability to conduct electricity, as measured in Siemens ...
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Conductivity is a measure of a solution's ability to conduct electricity, as measured in Siemens per meter (S/m). (lead image by @ddileona)
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Also see resources on this page: https://publiclab.org/wiki/conductivity_sensing
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Here's a list of different conductivity sensors and measurement systems. Also see below for some Do-It-Yourself approaches to measuring conductivity, and this page for more information.
Activities for people to test methods (these develop over time)
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