[LCD Display] Earth ground insulation is equipped with large LCD display with back-light, convenient to operate in the dark.[Function] This resistance tester has many functions such as over range indication, test lead connection alarm, TEST button for fast capture of measurement values, data hold, auto power off/battery check, earth voltage measurement.[Application] UT521 Earth Tester can perform precise 3-wire and simple 2-wire earth resistance measurement for power and electrical systems, light-ning protection equipment, and ground system of all electrical equipment.[Measurement Range] The Tester includes all hardware necessary to measure earth ground in 3 ranges from 20 to 2000 Ohm, easy to use.