I know it's a $24 gauge, what did I expect? Accuracy too? It's a shame when something that could be considered very valuable comes close but then falters. It feels premium, easy to read, easy to use, turns heads and I was impressed with its ability. for a quick seal when seating on the valve stem, all right, so what's the problem? Compared to the other three quality gauges, which all read the same, it reads a consistently low 3psi. I haven't been to the Boulder Tools website to investigate the possibility of recalibrating, but since the rubber surround isn't removable I doubt it's possible. I always add 3psi and it will always be remembered as a measure that could almost be really good and make a big difference. If it weren't for the relatively important inaccuracy, I'd give it five stars.