There is usually a display on the dial that shows the power reserve. Mechanical watch will show how long you can run before winding, quartz watch shows the battery level. Earliest power reserve appeared on the Nautical Clock centuries ago when ships sailing on the sea relied on time-honored sailing beacons to measure longitude and ensure sailing safety. Due to the timepiece is powered by mechanical devices, if there is not timely winding, it will happen when walking is not allowed to stop or even go. As a result, watchmakers began looking for a device that can visually display energy. Power reserve shows the working principle is that by measuring mechanical clockwork spare power (winding volume degree), the watch's energy for intuitive instructions. This indicating device, however, usually also has a fan-shaped window on the surface of the timepiece and indicates the margin with a pointer. Watch industry to evaluate the pros and cons of power storage there are two main criteria: one is a long power, that is, to maintain the watch when the power storage time as long as possible. The second is the more uniform the energy reduction rate the better. If a watch decay faster and faster of its energy, it will not go away. Therefore, the longer the energy reserve watch, the more uniform attenuation, the higher the requirements of tabulation technology, the table more difficult to do.
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