The hour glass is no longer looked at as a reliable timepiece, especially these days with atomic clocks which are accurate within micro-seconds at all times. The Sand+Time Watch mixes the design of the hour glass with the modern digital readout.
When the watch is on stand-by, a screensaver featuring a digital hour glass interface is shown. To see clock in real-time, just press a button and the current time is displayed.
— Andrew Dobrow