The first one I got was inaccurate compared to several gauges including Slime (old model), Craftsman and TPMS car display. I mean 0.5psi is fine but no more. The second read nothing and showed 0 the whole time. The idea is good as it is slightly larger than the Slime Digital Sport Tire Pressure Gauge ASIN: B000ET5264 but has better light, larger display, better grip and theoretically easier valve sealing. But in practice it lacks accuracy (when it actually works) and the sealing causes problems as you have to fiddle with it to get a reading - is sealing too much of the valve bore or is the gasket preventing pressure on the valve core to to open it.