The Calibration Tool, sounds like something complicated. Don't despair! We have designed this especially to use with the NeatCleats Align versions. These fit SPD-SL, LOOK and Speedplay. It gives you the ability to get exact dimensions of cleat position for your shoe. By the way, it is made from high-grade stainless steel and accurately printed to get your measurements spot on. Did you know how important the position of your shoe in relation to the pedal is? So this is an easy home solution for you to ensure that you get the necessary accuracy.