Megger manufactures hand-cranked digital three and four pole earth tester, megger det 3/2. This digital earth tester is a compact instrument which is designed to measure earth electrode resistance and soil resistivity. The instrument uses the four-terminal method of measurement in which the resistance of the current circuit does not affect the reading. The instrument circuit has been designed in such a way that the resistance of the potential circuit does not affect the measurement. The salient features of the hand-cranked digital three and four pole earth tester:
