What is the difference between a chronograph and chronometer?

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A chronograph is a watch which records time between two intervals. It has hands displaying hours, minutes and seconds. It can be either digital or analogue. In ananlogue watches, the chronograph function is carried out through sub dials inside the main dial. Each dial measures the time between intervals in hours, minutes or seconds. In the simplest terms, it is a watch that has a stopwatch function.
A chronograph normally comes with two buttons on the case. One above the winder or crown aond the other below it. The upper button starts and stops the time while the lower button resets it.

A chronometer, on the other hands on the other hand is watch which gets an official certification  for accuracy from the Official Swiss Chronometer Testing Institute (C.O.S.C). The COSC carries a 15 day rigorous tests for water resistance and precision at different positions and temperature. Once a watch passes the tests, it is issued the COSC certificate. Any COSC certified watch normally bears the word chronometer written inside the dial.

According to the Omega Official Website:

A chronograph is a watch with hands that display hours, minutes and seconds, together with a mechanism for measuring elapsed time by means of a central chronograph hand, which records seconds, and totalisers for the minutes and hours (not mandatory).

A chronometer is a watch whose movement has obtained an official rate certificate from the COSC (Official Swiss Chronometer Testing Institute) after having passed precision tests in different positions and at different temperatures. These tests are conducted over a 15-day period.

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