Adding supplemental scales to a chronograph--which is simply an exercise in printing, either on the dial or bezel--is very common. The industry abounds with tachymetre scales, pusometer scales and a few telemetrer scales. Generally to avoid clutter, most watches that have such scales feature just one. A couple of years ago, Villeret Minerva did a watch with both a tachymeter and a telemeter scale. The better question is "who uses these things"? To use a tachymeter scale you must be doing a timing of one unit of distance (generally a kilometer or mile). How often do you do that?????? A telemeter scale is useful only for thunderstorms. "Quick grab your watch there was a lightening flash!!!". Pulsometers are for measuring heart rate, but you do that in your head--just time 15 seconds or 30 seconds. For that matter the telementer scale is BS as well. Simply divide the delay from lightening to thunder by six and you have the distance in miles.