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The B3-40 microvoltmeter has been manufactured since 1976 by the Punane RET Tallinn plant. Designed to measure sinusoidal ac voltage in the range from 10 μV to 300 V. Frequency range from 5 Hz to 5 MHz. Input resistance 4 MΩ. Power consumption 15 V · A. Dimensions of the device 152x206x300 mm. Weight 7 kg.