This only got 4 stars because I originally bought it for my bike. When it arrived I found that the PSI sensor wasn't high enough to be effective on my bike (I think it goes up to 50 and my road bike tires wanted 65+). The gauge is well built and while it's not designed to give an accurate reading I love its simplicity and am glad I don't have to worry about the batteries dying etc. This pump was a great suggestion for Revain, so I'm planning to just stop putting it in the glove box of my car to use it in the car.