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The measuring amplifier "28 IM" was produced since 1955. Since 1960, the name of the amplifier has been changed to "U2-1A". The measuring amplifier '' 28 MI '' (U2-1A) is intended for testing and tuning special radio equipment. The device makes it possible to amplify and measure weak low-frequency signals, and complete with measuring lines to conduct measurements of the traveling-wave coefficient.