Throughout my life I have managed to sort through many tire pressure gauges, as I am unlucky enough to lose them often. These tire gauges work as advertised, they measure the air in a tire with sufficient accuracy for a standard inflation, they're easy enough for me to use and I haven't lost them yet. However, the build quality is weak compared to others I've had. Metal on the outside but appears to be entirely plastic on the inside. It doesn't seem to affect performance, but there is an "unreliable" feel. They probably wouldn't survive being hit by a car, but I haven't actually tested that.