Only recently have I discovered that there is something better than the old "push plastic rod out of metal cylinder" sensors. Wow! It actually gives you the same reading when you test the same tire repeatedly at less than 1psi. You have to be careful to push it all the way up against the valve stem and wait a second or you'll get a deceptively low reading. The device has enough light for you to find the valve stem and connect to it in dark environments.