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This books stands heads and shoulders above anything else written so far on the test and measurement of fiber optic systems and components. The other reviewers have given details about the books content, so I'll say why I liked the book. Two main reasons: 1) The authors go into detail regarding how different instruments work from physical principles. Such an understanding is useful in understanding a device's (and measurement's) accuracy and validity. 2) The practical tips and explanations on how to make measurement alone make this an essential reference. This book neatly compliments theoretical books and papers by explaining how the typical measurements you may read about in a journal article are made and the underlying issues that contribute/take away from a measurement's efficacy/accuracy. Some of my colleagues say that because this book was written by HP people and the examples shown involve HP instruments, this book loses some value. If so, this loss is miniscule. Most photonic test instruments, HP or not, work on more or less the same principles. Whether or not you own HP instruments, you will find this book an invaluable reference.