Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Complete Book Of Oscilloscopes

I bought this book to familiarize myself with oscilloscopes, and from that standpoint, the book was a total loss. Only someone highly knowledgeable about oscilloscopes would understand the book. It also puzzled me as to why an expert would want the book as the material is dated and hardly a complete guide to what was available even at the time the book was written.