Sorry for the delay, and now I found the thread closed. My instruments were out for calibration. The top unit, a four point ground resistance tester, can be used to develop soil resistivity tests also. With that information, and the available area, a manufacturer (Erico or Harger) can design a grounding electrode system. The bottom unit, a ground tester, can direct read grounding electrode resistance. The two meters and necessary test leads are worth about $4k. Are these what you use?
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