The record for measuring the exact time belongs to the atomic clock. In such devices, the time is counted by the cesium atom. For 1000 years of work, they can only be wrong by one second. The most accurate mechanical watch is the Tag Heuer Carrera Caliber 360.
The most accurate clock, regardless of whether it is a wristwatch, wall clock or table clock, is an atomic clock. Atomic devices measure time using natural oscillations associated with processes that occur at the atomic level.
Clock and cesium-133
In the late 1960s, the definition of a second was adopted in the international system of units SI. One second is the length of time during which the transition of the cesium-133 atom from one hyperfine state to another occurs. This period contains 9, 192, 631, 770 periods of cesium electromagnetic radiation. Therefore, now the generally accepted standard in measuring time is a clock that runs on cesium-133.
The first atomic wristwatch in the world
Previously, atomic clocks were such bulky instruments that they occupied entire laboratories. This continued until 2013, when John Patterson announced on Kickstarter a miniature atomic wristwatch called Bathys Cesium 133. However, they can only be called miniature with some stretch - their case has a size comparable to the size of a matchbox. However, this is a real atomic clock that runs on cesium-133. The accuracy of their move is such that for a thousand years Bathys Cesium 133 can run ahead or lag behind by just one second.
While development of Bathys Cesium 133 is at the prototype stage. Patterson managed to sell only a dozen copies of the device over the Internet. An additional inconvenience is that the battery in Bathys Cesium 133 needs to be changed every 36 hours. In addition, the watch weighs 90 grams and costs $ 6,000.
The most accurate mechanical watches
The most accurate of ordinary wristwatches is the Tag Heuer Carrera Caliber 360, produced by the Swiss company Tag Heuer. The model was created for car racers and is the only timepiece in the world that is capable of showing the time with an accuracy of one hundredth of a second. The Tag Heuer Carrera Caliber 360 does not use a quartz movement - they are completely mechanical.
This incredible precision is achieved through the use of a specially designed balance wheel that vibrates at 360,000 vibrations per hour. This is 100 times higher than any other mechanical watch. The chronometer has two independent high-precision movements at once. Carrera Caliber watches start at $ 6,000.
