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The Voltometer "VK7-9" from I quarter of 1967 was produced by the Tallinn plant Punane RET and Krasnodar spare parts. Voltmeter is designed to measure DC voltage from 0.1 to 500 V, AC voltage from 0.3 to 100 V in the range up to 700 MHz, up to 1000 V in the range up to 300 MHz and to measure the resistances.