"This book describes examples that demonstrate the elegance@ flexibility and utility of balanced-current coaxial networks in obtaining the ultimate in noise matching and interference elimination for precise and accurate voltage@ current and power measurements. It also updates an earlier book on coaxial AC bridges by including recent AC measurements of quantum Hall resistance to establish a primary quantum standard of impedance and by extending impedance measurements in general to higher frequencies. Author(s) Shakil Awan@ Bryan Kibble@ J??rgen Schurr"