VETERIS Hourglass Sand Timer Clock with Sparkling White Hour Glass Sandglass Clock Ideal for Exercise Tea Making Antique Nautical Décor Theme Height 6 Inches 5 Minutes Sand Clock

VETERIS An hourglass (or sand glass, sand timer,) is a device used to measure the passage of time. It comprises two glass bulbs connected vertically by a narrow neck that allows a regulated trickle of material (historically sand) from the upper bulb to the lower one. Factors affecting the time interval measured include sand quantity, sand coarseness, bulb size, and neck width. Hourglasses may be reused indefinitely by inverting the bulbs once the upper bulb is empty.