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The digital combined device "Shch4313" has been produced since 1988. The digital device is designed to measure: power and voltage of direct current; root-mean-square value of force and voltage of an alternating current of a sinusoidal form; DC resistance. The device is powered from an alternating current network with a voltage of 220 V and a frequency of 50 Hz or from a built-in DC source with a voltage of 12 ... 20 V. The continuous operation time of the device with mains supply is not more than 24 hours. The choice of the polarity of the measured value is carried out automatically, the selection of the measurement range and the type of the measured value manually. The measurement time is not more than 3 s for measuring current and voltage and 15 s for measuring DC resistance. The input resistance of a DC voltmeter is at least 20 MΩ at the limit of up to 200 mV and 1 MΩ at the remaining limits. Input resistance AC voltmeter (active) - 1 MΩ.