I just bought my first Harley and needed to check the shock pressure and ultimately add air. I tried several cheap routes and none let me off the shock quick enough to keep the proper pressure in the shock. I looked at the bike pump route and discovered the gauges were not low pressure scale to make it easy to read the air pressure. They were also approximately $30. Tried the sports ball pump and could not disconnect quick enough. I made a trip to the HD dealer and bought the "brand". It works terrific. Fine gauge and you can disconnsct from the stem and not lose any air. Yes, the right tool for the job.