The secret to perfect door frame fits? This little tool. Installing door frames over transition pieces presents a common challenge: how do you match the irregular contours of flooring transitions perfectly? One wrong cut and you’re left with visible gaps that look unprofessional. The solution is a contour gauge - a simple yet ingenious tool that most DIYers don’t know exists. How it works: A contour gauge consists of multiple thin pins that slide independently. When you press it against any surf