This introductory book on the subject of control system instrumentation emphasizes on sensors, transducers, and actuators. Specifically, the book deals with "instrumenting" a control system through the incorporation of suitable sensors, actuators, and associated interface hardware. In view of the practical considerations, design issues, and industrial techniques that are presented throughout the book, and in view of the simplified and snap-shot style presentation of more advanced theory and concepts, the book will serve as a useful reference tool for engineers, technicians, project managers, and other practicing professionals in industry and in research laboratories.