Easy to use, best option for quick ventilation. Technique: Install on the front of the driver, start the timer on the phone. The next bus starts every 15 seconds. Depending on tire size, leave on for 1-3 minutes and remove in the same order with the same amount of time. Tested on multiple sizes, same run time gives +-2 psi. From there, it's easy to set up. Decent quality brass, can check PSI with installed, easy to store.