The stop watches were Heuer's main product, the chronographs just a sideline, if we judge by production rates. I can't remember the precise ratio but it was something like stop watches outsold chronos by 10:1 or was it 100:1 ? (the quote from Jack Heuer about this is in Arno's book).

The deci stop watches which go from 0-100 in a minute are often referred to as for use in "time and motion studies" (much easier to add decimal times).