F5053 (Vol'tmetr srednikh znachenij) 1977
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The voltmeter of average values "‹"‹"Ф5053" was produced presumably since 1977. Electronic voltmeter F5053 with a needle reading, designed to measure AC voltage of various shapes in the frequency range from 10 Hz to 4 MHz, from 0 to 300 volts (6 limits). Read more in the instruction manual voltmeter.
Documentation:
Information from collection of Valery Khartchenko