looks like I'm in the minority) This is a good tool for adjusting ball pressure, although not perfect. You need to inflate the ball beyond its capacity, which most balls easily handle, and then gradually deflate using the button on the side. The device offers great accuracy. A NOTICE. My sensor does not look like the picture. It weighs up to 15 pounds, not 20 as shown in the picture, and the button on the side is plastic. These changes do not affect my opinion of the product, but it differs from the image on Amazon.