Talking about EMI (electromagnetic interference) signals, they are able to disturb the operation of your ground earth tester and cause it to give you inconsistent readings. This happens mainly at lower frequencies, such as 128 Hz. This is why, when performing soil resistivity testing, make sure you do so with a tester that can automatically select a test frequency for you, usually that’s an EMI-free one. You can also use a clamp-on ground earth tester, as it operates at higher frequencies.
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Soil Resistivity: Everything You Need to Know About Ground Resistance Testers – Into The Wild

Electrical charges are all around us, and thus, electricity can be harvested by almost every part of nature. However, making use of electricity isn't the only idea in mind of someone who wants to work on or build on any patch of land, a ground r