Often, when working on 3d prints or PCB work, I need something to get up close and get a better look. Rather than pull out my microscope, I often reach for a watchmaker's loupes. While the ones I have are quite inexpensive, they are super helpful. This little storage container just keeps them organized in my drawer by magnification: 5X, 10X, 15X, and 20X, which are typical ratings.