... . 2.Convenient to operate on site 3.full-automatic Digital Earth Resistance Tester, Lab Test Equipment Technical parameters:Temperature: 0°C~+45°CRH ... .01Ω,0.1Ω,0.01VThe error caused by Earth Auxiliary resistance and voltage Allow auxiliary earth resistance RC(between C1 and C2)0~2 ... "1" representative overflow, in line with the conventional measure habit. Earth Resistance Meter Lab Test Equipment