This project combines a sand timer with a rotating mechanism and an optical beam through the center of the timer to observe the falling sand as they create a USB Hourglass. This project combines a ...
5 MINUTE SAND TIMER SIZE: 2.8x5.1 inch. Made of premium metal & high borosilicate glass. The 5 min hourglass makes it easy to track your work, measure your progress.Suitable for birthday, exquisite ...
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