THE ORIGINAL Surfboard Measuring Tool! The E-Z Square Pro v15 has the ability to mark fin placement. An accurate time saver! Measure the nose, width, and tail dimensions of your surfboard in one E-Z step. Now wider, this tool measures boards up to 26″ accurately. Follow the directions on the E-Z Square Pro and you’re set. We have been selling a variation of this Square for over TWENTY YEARS, and this is the best one yet.