Uni-T Ut521/Ut522 Digital Earth Tester User Manual

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The UNI-T UT520 series Digital Earth Testers, including models UT521 and UT522, are designed for precise 3-wire and simple 2-wire earth resistance measurements. These devices are essential for power and electrical systems, lightning protection equipment, and ground systems of all electrical equipment. With a lightweight design, the UT520 series offers high economic value and convenience for fieldwork. Key features include manual range selection, low battery indication, data hold, LCD backlight, auto power off, full icon display, and double insulation protection. They also provide clear indications for poor contact (".Ω") and over-range ("OL") conditions.