Chronometer and Chronograph
Two different words to say two different things, pretty normal, no?
Actually, it’s two different functions that can apply to one and the same object.
A chronometer is a high-precision timing device. It is a mechanism capable of keeping time, that is, of being precise. In accordance with defined criteria, it can be certified in Switzerland by the COSC, the Swiss Official Chronometer Control Organization.
Whereas a chronograph, well, it’s a timekeeping device with one or more independent hands that you can start, stop and reset, to measure intervals of time. A
stopwatch will not give the time, it only allows measurements, while a chronograph watch will additionally indicate the time.