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Message: [QUOTE="Rich Rohrich, post: 636742, member: 16241"] Steve - You used to have to buy the device direct, but Summit started carrying them so it's way easier now. [url]www.summitracing.com[/url] It basically produces a Density Altitude correction number from Temp, Altitude, Baro and Humidity. They now have a version that uses an O2 sensor to get more accurate corrections. It has a bunch of drag race specific features that aren't of much value for us, but overall I've found it to be a very useful tool. I sure wish I had this when we were road racing :) [/QUOTE]