Fluke 57936 is the EI-1625 selective and stakeless earth ground clamp accessory set for use with Fluke earth ground testers. It contains the two current transformer clamps needed to perform selective and stakeless (rod-free) ground resistance measurements on installed earthing systems. The pairing allows technicians to test individual ground electrodes without disconnecting them and without driving auxiliary rods. Typical application is periodic verification of substation, telecom-site and building earthing systems.