CHRONOMETER
Today, a chronometer is a high-precision watch whose rate has been checked and certified by an independent body in accordance with ISO standard 3159. To obtain this certification, each Movement undergoes a battery of tests spread over several days, in different positions and at different temperatures; its average Daily rate must remain within strict tolerances, typically from -4 to +6 seconds per day for a mechanical movement. The term should not be confused with Chronograph, which refers to a function for measuring short periods of time. Historically, the marine chronometer was the instrument that made it possible to solve the problem of Longitude at sea. The quest for precision involves a Regulation / Adjustment of the Regulator, the quality of the Hairspring (balance spring), and extreme care given to the entire kinematic chain. The chronometer designation remains a guarantee of chronometric excellence.
Useful link:
– Chronometer certification according to the ISO 3159 standard
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