I used this for about a dozen before it stopped working. It doesn't fit well on the valve stem so you have to hit the valve stem at the perfect angle in one spot and then push it all the way in or air will escape - this compares to other digital gauges and standard analog button style gauges. . It's big and bulky, so it's not very suitable for motorcycle or bicycle tires. The display becomes darker at times and then no longer works at all. It could be the battery, although it's brand new, it's working so badly that it's not worth replacing.