USSR Vintage Impulse Pulse Meter Counter MES 54/МЭС-54 NEW IN BOX 1964'
(A) at the ratio of the pulse duration to the pause duration of 1.5: 1 and the average current for the period of 6 mA;. b) at the ratio of pulse duration to pause duration 1: 1.5 and the average current for the period of 2 mA.