I have noticed that there are various kinds of stop watch functions with different names.
What is the difference?
a stopwatch or a chronograph function can be:
1) a basic one with a central hand (which is started, stopped and returned to zero by successive pressing of its pushers);
2) a flyback chrono (where a single push stops, resets and restarts the function) and
3) a double one (which allows measurements of two different events).
I hope that my answer helps