MOM-1 (Lampovyj megommetr) 1947
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The lamp magommeter "MOM-1" was produced from the end of the 40s of the 20th century. The megger is a multi-range device for measuring DC resistances from 20 Ω to 10,000 Megohms. The device can also be used to measure the insulation resistance of capacitors, transformers, etc.
Documentation:
Information from collection of Valery Khartchenko