First of all, you can get away with purchasing a much cheaper version of this tool than the one we recommend, and I got away with it for years. However, once I purchased a 12” Starrett combination square, I realized what I was missing out on. It will ensure your planes are level, your stock is jointed right, your chisels are square, and all your work is perfect. It is a foundation for clean work in your woodworking projects. Like I said, the one we recommend isn’t necessary, but I had to recommend the Starrett because it’s one of the most useful tools I own, and it will save you from guessing the accuracy of your lines with a cheap one. Plus, all Starrett products are American made!