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The modulation meter "SK3-26" from I quarter of 1972 produced the Gorky plant named after MV Frunze. The device "SK3-26" is designed to measure the deviation of the frequency and depth of amplitude modulation. The range of central frequencies is 10 ... 500 MHz (operation in the range up to 1000 MHz with an external local oscillator with a capacity of 20 ... 50 mW is possible). The sensitivity of the modulation meter with an input impedance of 50 ohms at frequencies up to 250 MHz is no worse than 30 mV, at frequencies up to 500 MHz is no worse than 100 mV and up to 1000 MHz is not worse than 0.5 V. The maximum input voltage is 2.5 V. from 50 Hz to 20 kHz. The device allows to measure the frequency deviation up to 150 kHz and the amplitude modulation depth up to 100%. The device is powered from the AC mains voltage of 220 V, with a frequency of 50 Hz. Power consumption does not exceed 50 VA. The dimensions of the device - 360x175x375 mm. Its weight is 15 kg.