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An astatic "AMV" voltmeter was produced presumably since 1950. Designed for laboratory voltage measurements in AC circuits and for testing similar devices of lower classes. Accuracy class 0,5. The measurement range is 0 ... 600 V. The measurement range is 0-75, 0-150, 0-300 and 0-600 V. AMV voltmeters are devices in which the measuring mechanism is assembled according to an astatic circuit that reduces the influence of external magnetic fields to acceptable limits . On the common axis of the AMV device are placed two identical moving parts fastened together. Acting on them, the magnetic fields simultaneously cause rotational moments of mutually opposite directions, which balance the system.