Update: This is very difficult to use. It's almost impossible to get the right value because you have to try several times until it sits properly on the stem without letting air through. First, let's clear up any confusion. It is made in China. Thanks to the rubber coating, it seems more solid than it is, but it is comfortable to grip and in case of a fall. I haven't used the sensor much yet, but so far it's working well. The angled end of the valve works well, but since it doesn't have a straight position (0 degrees), it can be a bit awkward. The company contacted me before I received the product and several times since. Let's see how the service is if I need it. But other than that, it's pretty good value for money. It was a difficult decision considering all possible options.