Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Very Useful Reference

I bought this book as a quick reference for a Technical Support group I manage. We have a few dozen products that require an installer to run wires throughout a house. Unfortunately, a large majority of the calls I get are wiring related and this book provides tremendous insight into the problems created by improper wiring.If you want to learn about wiring, this is the book to buy. I also bought the full book that goes with it. It must be good because I got the only paperback, and all the used hardback books are almost double the retail price.From this guide you'll learn everything relating to wiring. You'll learn balanced vs unbalanced, ground loop isolation vs cross talk, and the list would almost be half as long as the pocket guide. Simply put, if your livlihood depends upon wiring, this book will help you a great deal.