Instead of experimenting with different cuts with my saw or blueprint and halving the angle (and then putting it on the corner fence), I can now use this digital gauge by reading the result divide by 2 and set the angle on my miter saw. As anyone who's done some refinishing knows, there's rarely a true 90 or 45 degree angle in a house (hence heel or toe gap corners and/or extensive use of caulk in painted trim joints). This tool doesn't work magic and your miter saw will need to be adjusted for a precise cut, but it certainly makes the process easier. Yes, the manual meter works well too, but my old eyes will surely appreciate the clear digital readings on this product.