Fluke-1621-Earth-Ground-Tester-FLUKE-FLUKE-1621-P-The-Fluke-1621-is-an-easy-to-use-earth-ground-tester-For-ground-resistance-testing-the-1621-is-the-first-line-of-defence-in-detecting-reliable-ground-connections-The-unit-features-basic-ground-testing-methods-including-3-pole-fall-of-potential-as-well-as-2-pole-ground-resistance-tests-Its-convenient-size-rugged-holster-&-large-clear-LCD-display-make-it-an-ideal-field-earth-ground-tester-for-most-electrical-grounding-work-environment