This thing reads a pressure about once a second. As you know, as long as there is air, it will be wrong. Having to wait 2-3 seconds to get a stable pressure reading is an abomination. You also need a very long valve stem for the clamp to work. On my Schrader car, a rubber boot gets in the way next to the rim so you have to hold onto the cartridge. My advice? Get the cheapest you can find. Even if they are not all made in the same factory, they are most likely made from the same quality parts. Always check Harbor Freight to see who's cloning who. There are certain things that you can no longer buy in good versions.