Digital angle gauges, also called inclinometers, measure the angle of tilt after being zeroed to a reference surface. They have a magnetized base that makes them easy to attach to most machine tables, fences, and blades in the shop. Woodworkers use them for tasks that range from setting the bevel on a sawblade to setting up a honing guide. How accurate are they? Are they better than a good square, drafting triangles, or a bevel gauge? We tested a number of them to find out.