I had to search a lot to find metric and imperial calibers. This is the only one I found and it's about the same price as the others. Plus, it's color-coded so you don't even have to worry about getting an accurate measurement. You can easily see how much time is left on your tires by seeing where your tires are being measured on the yellow bar. Using this sensor is also much faster and more accurate than digging around for a dime and figuring out how many Lincoln hairs you're seeing. I also bought every child. Highly recommended!