| http://www.w3.org/ns/prov#value | - The two probes of the apparatus comprise metal, e.g. stainless steel, rods about 6.5 mm in diameter and extending about 15 mm from the center of a plate, e.g. a disc that is 9 mm thick and 5 cm in diameter; the disks are electrically connected to an ohm-meter.
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