Amperavoltommetry "ABO-5M" and "ABO-5M1", respectively, from 1955 and from 1957 produced the Omsk plant "Electropribor". The ampervoltommetr of the type "ABO-5M" is a multi-range electrical measuring instrument used for measuring voltage and alternating current and direct current as well as measuring resistances up to 30 Meg. The multidirectional portable ampere-volt meter of the magnetoelectric system of the type "ABO-5M1" is designed to measure current and voltage in DC and AC circuits, as well as to measure DC resistance. The device is used at an ambient temperature from -10 ° C to 50 ° C and a relative humidity of 30 ... 80%. The device has the limits of measurement: DC power 60 μA, 300 μA, 3 ma, 30 ma, 120 ma, 1.2 a, 12 a. The voltage of the direct current is 3 V, 12 V, 30 V, 300 V, 600 V, 1200 V, 6000 V. AC power: 3 ma, 30 ma, 120 ma, 1.2 a, 12 a. The voltage of the alternating current is 3, 12, 30, 300, 600, 1200, 6000 V. The device has direct current resistance: 3 ... 300 ohm, 0.3 ... 30 lump, 0.03 ... 3 Mg. The device works with a decibel signal from -12 to 78 dB. For large measuring ranges, voltage dividers are used. The input resistance of the device is 20 com / in for all DC voltage measurement limits and 2 com / in for AC voltage limits. Dividers are included with the instrument.