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Since 1976, the megohmmeter M4100 has been manufactured by the Umansky plant Megommetr. Portable megohmmeter "M-4100" 'was produced in five versions for the output voltage and the highest value of the measured resistance. The megohmmeter "M4100" is a two-limit portable device and is designed to measure the insulation resistance of de-energized electrical circuits within five limits.