Title: Helped me Pass
Product review: Found this item to be a great product! Shipping was crazy fast (ordered 11pm Thurs night, at front door when I got home from work Friday evening!!) and was packaged well. The content (breakdown of emissions control systems and concepts of operation) wasn't as easy to follow as the motor age books, however the charts in the delmar book were AMAZINGLY helpful at breaking down HC, NOx, CO etc. and the conditions that affect the amount of output. Overall a great resource that , when combined with other manuals to round out a good study regiment, helped me a first time L1 tester pass.
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