This tool makes humans as close to foolproof as we can get, at least when it comes to measuring, cutting and installing trim without a flaw. We love that it’s a solid piece, with nothing adjustable on it, so you know its 45- and 90-degree angles are always true. It takes the gymnastics out of measuring, too, whether screwed to your workbench or temporarily tacked to the working wall with 6d finish nails, because of the built-in tape measure hooks. Even tricky inside-to-inside miters are a snap. Perfect 3/16-inch reveals on windows and door jambs are guaranteed every time: Just line it up and draw your guide with the pencil holes. Though it’s marketed for casements, we’d keep it in the toolbox for all kinds of jobs. Imagine installing baseboard up to door trim and lining up the Trim Loc for a perfect cutline every time. We think it’d be the perfect gauge for squaring saw blades, too. This little tool will save you time, money and lots of frustration.--Kris Jensen-Van Heste