The Megger DET4T Series of earth/ground testers meet the need for two-, three- or four-pole testing. The DET4TD2 and DET4TR2 can measure resistance from 0.01 ohms to 20 k-ohms, while the DET4TC2 and DET4TCR2 can measure resistance from 0.01 ohms to 200 k-ohms, a key capability for soil resistivity testing. Also, to allow accurate testing in noisy environments, the instruments are capable of rejecting noise up to 40 V peak to peak.