I went to check my tire pressure and had a big surprise waiting for me. I used a digital one I picked up from the auto parts store thinking it should be fairly accurate, check the first tire, it said 50lbs, wow! tried and old pen type and read 39lbs, then a dial type and it read 28lbs. Now I'm not sure what to believe. The one thing I didn't try was the one on tire pump combo kit in the trunk, I won't touch that unless I have too. I took my gauges to a Mr. tire and they checked them and the dial type was the most accurate, only off by -3lbs. That's close but I was wondering if there was anything better with out costing some ridiculous price.