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The grounding meter MS-08 has been manufactured since 1957 by the Moscow Energopribor plant. "MS-08" at one time was the main instrument for measuring the resistance of grounding devices. The device has its own power source in the form of a generator, driven in rotation by the handle. The presence of stray currents in the ground does not distort the readings very much. The electrical strength of the insulation is checked with an instrument by an earth meter "MS-08" at the limit of 1000 ohms. A gauge measurement method is implemented in the device. The device has three measurement limits: 1000, 100 and 10 Ohms and a special device that allows to compensate the resistance of the probe circuit if the resistance of the circuit is less than 1000 Ohms.