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The universal lamp voltmeter "VK7-4" was produced presumably since 1962. Designed to measure AC and DC voltages and electrical resistance. The device is designed to work in laboratories and repair shops. The limits of measurement of DC voltage on seven scales: 0.5; 1.5; five; 15; 50; 150 and 500 V. The error in the measurement of direct current at the limit of 0.5 V does not exceed ± 4% of the upper limit of measurement and ± 2.5% on the remaining limits. The input resistance of a voltmeter when measuring DC voltages of 25 MΩ. Limits of measurement of tension of alternating current on five scales: 1,5; five; 15; 50 and 150 V. The frequency range of the device from 20 Hz to 700 MHz. Accuracy measurement voltage AC: ± 4% at frequencies from 55 Hz to 30 MHz; ± 6% at frequencies from 20 to 55 Hz and from 30 to 75 MHz; ± 10% at frequencies from 75 to 400 MHz; ± 20% at frequencies from 400 to 700 MHz. The active input impedance of a voltmeter is 5 MΩ at a frequency of 1 KHz, 0.5 MΩ at a frequency of 10 MHz and 50 kΩ at a frequency of 100 MHz. The input capacitance of the probe is not more than 2 pF to a screen of not more than 2.5 pF. The limits of measurement of active resistance on seven scales with a multiplier readings: 10; 100 ohm; one; ten; 100 com; 1 and 10 Mom. The measurement error of resistances at the limit of XY ohm does not exceed ± 4% of the length of the working part of the scale and ± 2.5% for the remaining limits. Power consumption does not exceed 80 watts. Dimensions: 330x255x230 mm. The weight of the device is not more than 10 kg.