Haven't been diving in a while? Need a little refresher and get caught up on any new information or techniques? Try the newly-revised Scuba Tune-Up Guidebook. The Guidebook allows you to quickly and effectively review scuba diving fundamentals. Each quick quiz assessment covers a different area of dive theory. safety, problem management, etc. Correct answers allows you to finish the book quickly. Incorrect answers direct you to an explanation of the concept. (#70097)