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Ammeter "M-104" from the beginning of 1954 produced the Leningrad plant "Vibrator". The ammeter type "M104" is a portable laboratory multidirectional instrument of the magnetoelectric system with direct reading, designed to measure the current in DC circuits. The ammeter was manufactured for the following measurement ranges: 0.015 - 0.03 - 0.075 - 0.15 - 0.3 - 0.75 - 1.5 - 3 - 7.5 - 15 - 30 amperes. According to the accuracy class, the instruments were divided into M104 (class 0.5) and M104 / 1 (class 0.2). The error caused by the temperature deviation from normal does not exceed / - 0.2% from the upper limit of measurement by every 10 degrees. The change in the instrument readings under the influence of an external magnetic field with a strength of 5 Oe is no more than / - 0.5% of the upper limit of measurement. The voltage drop across the measurement range (the table is duplicated on the scale): 0.015 - 0.03 - 0.075 - 0.15 A - 32 - 47 mV, 0.3 - 0.75 - 1.5 - 3 A 48 - 65 mV, 7 , 5 - 15 - 30 A, 87 - 175 mV (typical values "‹"‹for specific series of devices may differ in a smaller direction) The test voltage of the insulation between the current-carrying parts and the housing is 2 kV. Overall dimensions 200x300x120 mm. The weight of the device is 4.5 kg, the weight of the device with a case is 6.1 kg. The device type M104 is decorated in a carbolite dust-proof case. The measuring mechanism consists of a moving frame and a magnetic system. The magnet assembly consists of two permanent magnets having the shape of a parallelepiped cast from a nickel-aluminum alloy. To adjust the current consumption mechanism is equipped with two magnetic shunts. The instrument's scale is mirrored, divided into 150 divisions 140 mm long. Glass arrow. Calming the device (2 seconds) electromagnetic. The devices were supplied with cases representing a calico suitcase with a carrying handle and locks, pasted over with red velvet. Included case. Price '' M-104 '' 1225 rubles for 1954.