AEMC 4500 20k ohm 4 Point Ground Resistance Tester

The AEMC 4500 20k ohms 4 Point Ground Resistance Tester is designed for measuring very low resistance on large grounding systems, such as ground grids and ground mats. It rejects high levels of interference voltages at DC or 60 Hz and its harmonics, and can be used under difficult conditions such as high stray currents or excessive auxiliary electrode resistance without substantially affecting accuracy.