If you do woodworking and DIYing in inches, a solid understanding of fractions is essential. Being able to calculate that half of 4 1/4" is 2 1/8", or that 1 1/2 + 1 3/16 = 2 11/16" is basic shop math that will keep your projects moving quickly.
But often, bringing fractions into the process is, well, completely unnecessary. Let's say you have a board that you'd like to divide into equal parts. You could measure it, then bust out a pencil, paper, and the calculator app, and eventually have to Google a decimal-to-fraction converter to figure out the size of each section. Then, you'd have to find that crazy number on your ruler, and carefully add the units together to mark out your parts. Or... you could just do this.
Among all the items in my shop, the measuring, marking, and layout tools are probably my favorite. Mostly, I love how historic they are: dividers, squares, calipers, rulers, and marking gauges have all been around for centuries, remaining mostly unchanged in their design and intended purpose. And who doesn't love a clear, crisp, and accurate line to work to?
I recently picked up this neat little tool after some raving reviews from fellow DIYers. It's quickly become a tool that I cannot live without and after you see what all it does, it'll become an essential to your projects.