A diifferent Wixey product -- a digital read out for a thickness planer that works with (almost?) all planers is available. I don't know how I got along without one. It allows very accurate thickness planing and helps me with incremental planing -- I don't take too small or too big a "bite" anymore.
I do use a claliper to check the thickness when I get close to what I am aiming for in thickness.
Joe