Using a Multimeter to Estimate Conductivity in a Water Sample

This provides an alternative to using a conductivity meter. Even though 9-volt batteries are cheaper and safer, their voltage may drop during discharge if they have been heavily used. This would make your readings unreliable. If you want to use 9-volt batteries they need to be fresh. Lead-acid batteries work best because their voltage only drops when they are almost completely discharged. Graphite electrodes are used because electrolysis process is very corrosive in most metals. This is part of an activity

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• #electrolytes
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• #conductivity