Earth Tester

The measurement of ground resistance for an earthing system of any electrical equipment is very important for human & equipment safety. It should be done when the electrode is first installed, and then at periodic intervals thereafter. This ensures that the resistance-to-ground does not increase over time. There are two methods for testing an electrical grounding system. The first is the 3-point or Fall-of- Potential method and the second is the clamp-on method.