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NOTE: To get off this list, send email to majordomo@aqua.ccwr.ac.za with the body of the message containing the line: unsubscribe sowacs Sir, There are standard cells for this kind of measurement. I don't know if there is some standard procedure for measuring. We did resistivity measurements in the past, and we designed and made our own cells. Size cells were according with measured resistivity range and maximum accuracy of our instruments. In general, regular section (paralepiped or half cylindre) of e.g. pvc with a stainless steel sheet full section at bottom and top sealed with silicone. Measurements were carried out in 1 to 10 kHz range in order to avoid contact and electrode effects. In our measurement range, physiological saline solution purcased in pharmacy/aphoteke/hospital was enough. I hope this may help. please contact with me for further information. Sincerely, Josep M. Torrents Universitat PolitËcnica de Catalunya torrents@eel.upc.es owner-sowacs@aqua.ccwr.ac.za ha escrit: > A student of mine is doing a project about the resistivity of water > > Do you have any experimantal proceedures that she could see. She has > standard school equipment for voltage and current measurement. > > Many thanks Pete Kelly > kellyp@alford.aberdeenshire.sch.uk > Alford Academy