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The Q-meter "E4-5A" was produced presumably since 1975. Designed for direct measurement of the quality factor of coils in the LF and HF bands, determining the resonant capacitance of inductors, the main RF parameters of two-terminal networks. Used to control production processes; scientific research: measurements of components of impedances, determination of properties of dielectric and ferromagnetic materials. The frequency range is 15 ... 250 MHz. The limits of measuring the quality factor: scales up to 400 from 5 to 1200; over 400 with multipliers of 1.5; 2; 2.5; 3. The accuracy of measuring the quality factor E4-5A: from 15 MHz to 100 MHz - 10; from 100 MHz to 250 MHz - not standardized. The limits of measuring the capacitance of a measuring unit capacitor are from 10 to 100 pF. The low frequency graduation error of the main capacitor of the measuring unit is 1 pF. The dimensions of the device are 450x250x330 mm. Weight 13 kg.