About the book: 1991 / Continuing the story about the use of the OML series oscilloscope in amateur radio practice, begun in the previous issue of the brochure "The Oscilloscope is Yours" assistant" (how to work with an oscilloscope), we bring to the attention of readers descriptions of electronic attachments for an oscilloscope. Using one of the attachments, you can monitor the performance of resistors, capacitors, transistors, diodes, zener diodes, and using the other, “view” the characteristics of bipolar transistors of different structures. The third set-top box will “draw” two or three scan lines on the screen, and on each of them it will be possible to observe “its own” signal of the controlled or adjusted electronic device. Other set-top boxes described in the brochure will allow you to either analyze the amplitude-frequency response of, say, an AF amplifier, or visually determine the frequency of the electrical oscillator. In addition, practical advice is given on refining and improving not only the OML series oscilloscope, but also some other industrial oscilloscopes produced specifically for radio amateurs, as well as descriptions of the circuits of some specific attachments.