The BESANTEK BSTET101 Digital Ground Resistance Tester is used to measure the ohms (Ohm) of an earth grounding installation for buildings (residential, office, labs, hospitals), computer server rooms, military installations, cellular sites, radio and cable towers, etc. It is used to determine if the earth (or ground) is a good conductor of electricity. This model offers three measurement ranges for earth resistance, up to 4kOhm.