A survey and discussion of well-known microwave impedance measurement techniques is presented.The discussion includes an introduction which emphasizes basic concepts and reflection coefficient-VSWR relationships.Sources of error in the various measurement techniques are discussed and methods to reduce errors are presented.The discussion of errors in slotted line and reflectometer * techniques is most thorough.Methods using rotating loops and resonance lines are included and a brief discussion of microwave impedance standards is given. (Author).