The AEMC 2141.01 Model 6416 Clamp-On Ground Resistance Tester measures ground rod, grid resistance and impedance without the use of auxiliary rods. It tests frequency selection for more accurate results in inductive environments and offers touch voltage indication with a warning buzzer when voltage is potentially dangerous, as well as loop resistance indication to alert the user the measurement may not be ground resistance. Ground Resistance Tester enables measurement of leakage current flowing to ground or circulating to ground loops from 0.2mA to 40A and resistance from 0.01 to 1500Ω. It has a large multi-function bright yellow organic display, data storage for up to 300 measurements and offers easy clamp opening with a 35mm clamp diameter.