Just one step! Usually you need to add air, then remove the air hose, then use a pressure gauge to check the correct air pressure. A start too low. With this air gauge you can add air, remove air and check everything in one step.
Pros
Digital LCD Screen: 360 degree rotating LCD screen with built-in backlight for better readability in low light conditions. It also has a power saving feature that automatically closes after 30 seconds of inactivity to save battery life.