digital earth resistance tester, with 2 pole, 3 pole, 4 pole to test earth resistance,soil resistivity,ac voltage SAT-10C ... is with these functions below:Features: 1. When measuring by 2-pole, there is no need digging the auxiliary rod, the test ... by 2-pole, 3-pole and 4-pole Re range(Ω)Resolution(Ω)Accuracy0~19.990.01±(2%+2d)20~199.90.1±(2%+2d)200~19991±(2%+2d ...