Allows you to test today's cars higher pressure cooling systems and pressure caps up to 30 lbs.. The gauge includes new cap testing pressure ranges of 17-19 lbs., 20 lbs., and 28-30 lbs.. The larger color coded dial makes it easy to accurately test these higher pressure caps and systems. Also includes a pressure release bar that, when turned clockwise, releases pressure buildup before removing the head from the neck. Comes in a plastic carrying case Includes: one 12559 spacer to drop in 1" deep filler necks for testing; one 12552 cap adapter to check standard "A" size caps, and a complete easy to use instruction manual.