VK7-3 (Vol'tommetr lampovyj) 1963
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The voltmeter lamp "VK7-3" (A4-M2) has been produced since 1963. It is a complete analog of the A4-M2 voltmeter and is also designed to measure direct and alternating voltages, direct current resistances, capacitance values "‹"‹and inductances. Voltmeter "A4-M2" is available on the site.
Documentation:
Information from collection of Valery Khartchenko