A watch thats undergone precision tests in an official institute Requirements are strict: a few seconds per day in the high and low temperatures (for mechanical watches) and in positions ordinarily encountered
refers to Swiss watches that meet standards set by the Swiss Official Chronometer Control Due to these standards, chronometers are very high grade watches
A watch that has obtained a certificate from an official neutral testing center such as "COSC" (Controle Officiel Swiss des Chronometres) or "SOCC" (Swiss office for chronometric controls) after having passed strict precision tests for accuracy These tests are performed in a laboratory over a minimum 15-day period They test the movement alone, using successive daily rate figures at different temperatures and with the movement in different positions
> Any precise timekeeper, keeping accurate time in all weather and used in navigation An accurate boxed ship's clock, usually in two or eight day versions
Technically speaking, all watches are chronometers But for a Swiss made watch to be called a chronometer, it must meet certain very high standards set by the Swiss Official Chronometer Control (C O S C ) If you have a Swiss watch labeled as a chronometer, you can be certain that it has a mechanical movement of the very highest quality -- undergone a series of precision tests in an official institute The requirements are very severe: a few seconds per day in the most unfavourable temperature conditions (for mechanical watches) and positions that are ordinarily encountered
A precision watch that is set in various temperatures and positions, thus meeting the accuracy standards set by an official watch institute in Switzerland Most watch companies either provide this certificate with a purchase or it can be mailed to you
Watch which has undergone a series of precision tests in an official institute The requirements are very severe: a few seconds per day in the most unfavourable temperature conditions (for mechanical watches) and positions that are ordinarily encountered
A watch that is a certified "Chronometer" has passed vigorous tests that demand the watch stands up to the high standard of precision the COSC demands (Swiss Official Chronometer Control) The mechanical movement must be close to perfection If punctuality is your motto, consider a certified "Chronometer"
A chronometer is an extremely accurate clock that is used especially by sailors at sea. a very exact clock, used for scientific purposes. Mechanical timekeeping device of great accuracy, particularly one used for determining longitude (see latitude and longitude) at sea. Early weight-and pendulum-driven clocks were inaccurate because of friction and temperature changes and could not be used at sea because of the ship's motion. In 1735 John Harrison invented and constructed the first of four practical marine timekeepers. The modern marine chronometer is suspended to remain horizontal whatever the inclination of the ship and differs in parts of its mechanism from the ordinary watch. A chronometer may provide timekeeping accurate to within 0.1 second per day. See also Ferdinand Berthoud
A portable timekeeper, with a heavy compensation balance, and usually beating half seconds; intended to keep time with great accuracy for use an astronomical observations, in determining longitude, etc