Sets out the methods of electronic measurements, the principles of equipment construction and the issues of its application. Unlike the previous edition (1975), new measurement methods in the structures of modern devices, the use of microprocessors and microcomputers in measuring instruments are considered. methods of testing digital circuits and microprocessor systems, principles of building automatic measuring systems and system interfaces. Measurement errors and measuring instruments are described in more detail. For engineering workers using and developing measuring equipment, it can be recommended for university students.