Electrical measurements and instrumentation are generally at the heart of industrial process control and manufacturing. To implement equipment systems and infrastructure investment will depend on the extent of electrical quantities to cover, but also the level of uncertainty sought for calibrations. With regards to subject, this book discussed a comprehensive overview of the various tools and instruments for electrical measurement, technical characteristics of existing analog and digital devices. The advances discussed in this book provide an innovative measurement system, a technical electrical testing, a characterization of various parameters and experimentation to check the behaviour of the equipment. Analysis and modeling are carried out to assess the performance of measurement. Furthermore, this book describes some applications in various fields as in medical, in pharmaceutical, in energy measurement and control, in computer vision and others. This book is suitable for engineers, quality control technician and researchers.