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The millivoltmeter "B3-25" from 1973 was produced by the Tallinn plant "Punane-RET". The millivoltmeter '' B3-25 '' is intended for measuring sinusoidal voltage from 3 mV to 3 V, in the frequency range from 100 KHz to 1000 MHz in the measurement range 10, 30, 100, 300 mV, 1 and 3 V.