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The Hioki 9214 auxiliary earthing rods are a component of a ground resistance testing setup, along with measuring cables and ground resistance tester (sold separately). The auxiliary earthing rods are an accessory for the Hioki HiTester model 3151 (sold separately). The rods come in sets of two. Hioki manufactures memory recorders, automatic test equipment, and electronic testing and measurement instruments. The company, founded in 1935, is headquartered in Japan and has a U.S. office in Cranbury, NJ.