The manometer is easy to use and easy to read, it just doesn't have a release button (valve). It looks well made and I use it on my cars. The description says "The release button releases extra air" from your tires to set the tire pressure accurately." As I mentioned above, the pressure gauge I received doesn't have a deflation button, so it has the Doesn't deflate tire and doesn't hold pressure on the dial after you remove it from the valve stem If you want or want a deflation button, buy a different caliber.