Bar tools are the equipment that let you interact with the liquids you use to make cocktails. I think how you use them and the ones you choose to use are personal choices. It has always been one of those "learn the rules so you can break them" kind of things. Some places like you to use certain jiggers because that's how they have always done it. In this day and age of bartending, it would be foolish to show up to work and use anything you aren't comfortable with. I doubt jockeys show up to the race and get blindsided with a saddle they have never used before. I am going to walk you through my tools and why I use them and where you can get them.