A watch is one of the most important tools in human life. Without a watch, it is impossible to know the exact time. With the passage of time and the advancement of technology, better and more advanced mechanical systems have been invented to make watches. There are various types of watches, including wristwatches, wall clocks, computer clocks, etc. Today, in addition to determining the time, watches are used as a decorative device in different places such as homes or in human style and type. A watch is one of the oldest inventions of mankind that meets the need to measure time intervals shorter than natural units. For more than a millennium, various devices with different operating principles have been used as watches. The first examples of modern watches can be considered watches that worked based on the movement of nature; Such as a sundial that displays a shadow on a flat surface, or an hourglass or sand timer consisting of two connected glass bubbles with a thin glass tube between them, designed to allow sand to pass through at a certain speed, or water clocks that are probably among the first examples of clock invention.