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Q. I want to surprise my husband with a new power tool. He's been asking for a miter saw. He'll be using it to build a deck, garden shed and all-new interior wood trim around our doors and windows.

Ever tried a spot of do-it-yourself work and ended up wasting good wood by making the wrong cut? As Steve Jobs might have said, “there’s an app for that” — or, in this case, a whole smart miter saw ...