This third edition maintains the unique approach of the previous editions. It is unique because corrosion data are presented in terms of corrosives or environments rather than in terms of materials. This approach saves thumbing through many chapters on materials to determine likely candidate materials for a given corrosion problem (e.g., sulfuric acid). Isocorrosion charts (invented by the author) present a quick look at candidates for a particular corrosive. Corrosion testing is the backbone of corrosion engineering. Chapter 4 includes simple and advanced complicated tests. Description of corrosion tests for plastics and elastomers has been expanded. The effects of the “revolution" in electronic instrumentation are described. Many types of electronic instrumentation are mentioned and references are provided for in-depth study.