**** Update 9-11-17. -- So I haven't used it more than 4 times. I was going to get it out of my saddlebag to use last night and the tip came off. The part that fits over the valve stem. At that point it was impossible to fix. What a waste of money. I just bought a Honda VTX 1300 and needed an accurate pressure gauge to put on the valve stem given the wheels, location and accessories on the bike etc. I have to say it's nice to know that this thing is doing its job well. It rotates enough that you can see the pressure when you place it and press it onto the valve stem, and will maintain the specified pressure after you remove it. Very convenient. The markings and spaces between 10-20-30- etc let you clearly see how much pressure the T------- I am using 37psi on the rear tire and 35 on the front tire as an example. Personal preferences for weight and handling. When you're done, the little release button on the side resets the gauge to zero PSI. If I were to throw this at someone it would definitely allow me to run for my life as this thing would most likely KO a person if it hit a person directly in the face or head. That little thing is so reliable. Now I'm not going to put it on some super gauge that claims to measure these things. I am satisfied with this device and the price and its accuracy. The bike shop was charging over $30 for the same thing with an inner tube attached. This fits perfectly in my saddlebag so I can take it out at any time.