I bought a scanner on eBay about a year ago, but had never really mastered it, partly because of infrequent use, but also because I never had an understanding of basic concepts, despite reading the manual. This book is good value at Amazon prices and has given me much greater clarity about what the scanner can do and how to use it. I follow endurance sports cars and can now find and follow the teams much more easily than before. A good and easy read.
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