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Microamperemeters and millivoltmeters of the LM series. Release since 1954. Microamperemeters and millivoltmeters of type LM (LM, LM-1) are portable laboratory single-limiting devices of a magnetoelectric system with direct reading, intended respectively for measuring the current and voltage in DC circuits. Microammeters and millivoltmeters were produced for the following measurement ranges: 0"“50; 0 - 75; 0-100; 0 - 150; 0 - 300; 0 - 500; 0 - 750; 0 - 1000 mk. 0"“10; 0 - 15; 0 - 30; 0 - 45 mv. Accuracy class - 0.5. The operating temperature range is from 10 to 350 ° C. Changing the readings of the device from temperature drift away from normal (200 ° C) does not exceed / - 0.5% of the upper limit of the scale by every 10 degrees. The change in instrument readings from the influence of an external magnetic field does not exceed 2.5% of this indication. Overall dimensions of the device 175Ñ…170Ñ…129 mm. Weight 1.7 kg. The price of the device is 296 rubles (1954).